Trico Spinner

Here's the full product description for the Trico Spinner:

The Trico Spinner

There is a form of dry fly fishing that exists at the far end of the skill spectrum — a place where the flies are smaller than most anglers are comfortable fishing, the fish are larger and more selective than most hatch situations produce, the window is compressed into a morning hour that rewards the disciplined and punishes the unprepared, and the combination of all these factors creates one of the most technically demanding and most deeply satisfying experiences available to the modern fly angler. Trico fishing is that form of dry fly fishing. And the Trico Spinner is the fly that unlocks it.

Trico — shorthand for Tricorythodes, a genus of small mayflies in the family Tricorythidae — is in many respects the opposite of everything that makes fly fishing dramatic in the conventional sense. The insects are tiny, typically requiring imitations in the size 18 to 26 range. The hatch occurs in the early morning hours, often beginning before most anglers are on the water and ending before the day's other hatches have begun. The fish that eat them are frequently the largest and most experienced in any given river — fish that have survived multiple seasons of angling pressure specifically because they have learned to feed on small, abundant food items that the majority of anglers cannot or choose not to imitate. And the spinner fall — the specific phase of the Trico life cycle that produces the most concentrated and most extraordinary surface feeding — requires not a large, visible attractor pattern but a size 20 or smaller spent-wing spinner imitation presented on a 7X tippet to fish that are rising every four to six seconds and refusing everything that is not exactly right.

That is Trico fishing at its most demanding. That is also Trico fishing at its most rewarding — and the Trico Spinner is the pattern that makes it possible.

The Trico Life Cycle

Understanding the Trico's biology is not merely academic background — it is the practical foundation for fishing the hatch effectively, because the specific phase of the life cycle being imitated determines everything from fly selection to presentation approach to the time of day the angler needs to be on the water.

Trico nymphs — tiny, flattened crawlers — spend the majority of their lives in the substrate and on the surfaces of rocks and aquatic vegetation in cold, clean, moderately paced rivers. They prefer the calmer sections of rivers — flat glides, slow pools, and the gentle current edges between riffles — rather than the fast pocket water that stonefly and many caddis species favor. Where the substrate is fine gravel, sand, and silt in clear cold water with consistent flow, Trico populations can reach extraordinary densities — densities that make the morning spinner fall one of the most food-rich events of the entire season.

The male Trico duns — smaller than the females, with dark olive to black bodies — emerge primarily in the evening hours on most rivers, transforming quickly to spinners overnight in the bankside vegetation. Female duns emerge in the very early morning hours, with their timing varying by season — earlier in summer when temperatures are warm, progressively later into the morning as fall temperatures lower. This emergence timing means that the first Trico activity most anglers observe on any given morning is not the dun emergence but the gathering of male spinners above the water, followed by the mating swarms, followed by the spinner fall as both males and females return to the water to deposit eggs and die.

The spinner fall is the event that defines Trico fishing. Spent Trico spinners — both the tiny black males with white wings and the slightly larger olive females with clear wings — fall to the water's surface in extraordinary numbers during the spinner fall, creating a surface so densely covered with naturals on productive Trico rivers that individual spent flies are difficult to distinguish. Trout positioned in feeding lanes during this event feed with a rhythm and consistency unlike almost any other hatch situation — rising every few seconds, barely moving from their positions, intercepting one spinner after another with the unhurried efficiency of a fish that knows the food is not going anywhere.

That steady, rhythmic rise is simultaneously the most characteristic feature of Trico fishing and the most important tactical indicator available to the observant angler. A fish rising every four to six seconds in a consistent position during the morning Trico spinner fall is feeding on spinners — not on emergers, not on duns, not on a mixed assortment of food items. A Trico Spinner in the correct size and color, presented on a drag-free drift to arrive at the fish's position on the current of its feeding rhythm, is the precise and specific answer to that precise and specific feeding situation.

The Spinner Pattern — Why Spent Wing

The Trico Spinner's spent-wing configuration — horizontal wings tied flat to the sides of the hook rather than upright in the classic dry fly posture — is not an aesthetic choice but an imitative necessity that reflects the specific posture of a dead or dying Trico spinner in the surface film.

A spent Trico spinner is not a live insect sitting on the water's surface preparing to fly. It is a dead or nearly dead insect, its reproductive function complete, lying flat in the surface film with its wings extended horizontally and its body flush in or just below the surface tension. This posture is dramatically different from the upright-winged profile of a Trico dun, and fish that are feeding specifically on spent spinners during the fall are keyed on the horizontal wing silhouette to a degree that makes upright-winged patterns — even those tied to closely approximate Trico coloring and size — produce a fraction of the takes that a properly tied spent-wing spinner generates.

The wings on a Trico Spinner are typically tied with white poly yarn, CDC, or fine white hackle fibers that spread horizontally from the hook and lie flat on the surface film — creating the exact silhouette of the spent natural from below. From a trout's perspective looking up at the surface, a properly tied Trico Spinner presents as two clear, flat wings with a tiny dark body between them, resting flush in the film — the specific image that the fish has been conditioned to associate with food during every Trico spinner fall it has experienced across its life.

The body — typically tied with very fine dark dubbing, tying thread, or CDC in the appropriate color — should be as slim and as accurately colored as the tying materials allow. The tiny hook size that most Trico fishing demands — size 18 at the large end, size 20 to 24 for most situations, size 26 for the most demanding tailwater and spring creek applications — leaves minimal room for error in the body proportions, and a well-tied Trico Spinner at size 22 is one of the most precise and technically demanding ties in the fly tier's repertoire.

Black and White vs. Olive — Matching the Sex and Species

The two color phases of the Trico Spinner — the small, jet-black male with white wings, and the slightly larger olive-bodied female with clear wings — are both present during the spinner fall on most Trico rivers, and fish that are feeding selectively during a heavy fall sometimes show a marked preference for one over the other.

The black male Trico Spinner is the most widely fished and most universally effective version, reflecting the male's smaller size, darker coloring, and numerical dominance in the spinner fall on most rivers. During the main spinner fall event, males constitute the majority of insects on the water surface simply because they are present in greater numbers — the male-to-female ratio in Trico populations heavily favors males, and the male spinners return to the water during the most concentrated portion of the fall. A black Trico Spinner with white poly or CDC wings in size 18 to 24 is the baseline pattern for Trico fishing on virtually any river without specific local information suggesting otherwise.

The olive female Trico Spinner — larger and lighter colored than the male, with a distinctly olive-brown abdomen — is most important during the early portion of the spinner fall when female duns are completing their emergence and transformation to spinner before returning to the water. On rivers with particularly large female Trico populations, a size 16 or 18 olive Spinner produces fish that the smaller black version does not during this early window. Carrying both versions and observing which color the fish are preferring on any given morning — a determination made by watching rise forms and attempting to identify what the fish are actually eating — is the approach that consistently produces the most fish during Trico sessions on complex rivers.

When and Where Trico Fishing Occurs

The Trico hatch's geographic distribution across North American trout rivers is extensive enough that serious anglers can find quality Trico fishing on most well-known eastern and western rivers, but the specific rivers and specific sections where Trico populations are dense enough to produce the spinner falls that define the hatch's reputation require identification based on local knowledge and direct observation.

Summer is the heart of Trico season across most of North America — the combination of warm temperatures, long days, and the specific water conditions that Trico nymphs require produces the most concentrated and most reliable spinner falls of the year from late June through September on most rivers with significant Trico populations. Early in the summer the spinner fall typically occurs in the very early morning hours — sometimes as early as 6 or 7 am on warm July mornings — requiring anglers to be on the water before most people would consider reasonable for a fishing trip. As fall approaches and temperatures drop, the spinner fall shifts progressively later into the morning, sometimes not beginning until 9 or 10 am on cool September mornings — a timing that is more accessible to anglers who find 5 am arrival times prohibitive.

Fall extends the Trico season on most rivers into October and occasionally November in the warmest years, with the later, longer spinner falls of autumn often producing the most accessible and most unhurried Trico fishing of the entire season. Fall Trico spinner falls on rivers like the Madison, the Delaware, and the Henry's Fork can last two to three hours as cool temperatures slow both the insects' activity and the fish's feeding rhythm, creating an extended window of consistent surface feeding that summer's shorter, more intense falls do not provide.

The Madison River in Montana is among the most famous Trico rivers in the American West — the combination of abundant Trico populations, large, sophisticated brown and rainbow trout, and the river's characteristic flat, clear glides that concentrate both spinners and feeding fish produces Trico fishing of extraordinary quality across most of the river's length from midsummer through fall. The flat, slow-moving sections of the Madison below Ennis — the so-called Madison Valley stretch — are particularly productive during the morning Trico spinner fall and produce some of the most technical and most rewarding dry fly fishing available on any Montana river.

The Henry's Fork in Idaho — specifically the Railroad Ranch section, which has achieved legendary status in American fly fishing for the selectivity of its rainbow trout and the complexity of its hatches — produces one of the most demanding Trico fishing experiences available anywhere in the country. Henry's Fork rainbows feeding on the morning Trico spinner fall are among the most technically challenging dry fly targets in freshwater angling — large, experienced fish rising in flat, clear water to tiny naturals with a selectivity that defeats most anglers and rewards only those who have developed the full combination of precise pattern selection, fine tippet management, and exact presentation that this specific fishing demands.

The Delaware River system — both the main stem and the East and West Branches — produces outstanding Trico fishing during the summer and fall months, with large brown trout in the flat, clear glides between riffles feeding on morning spinner falls with a consistency and selectivity that defines what many eastern anglers consider the highest expression of technical dry fly fishing. The Delaware's Trico fishing is less famous than its Green Drake or Sulphur hatches but is arguably the most demanding and most consistently productive dry fly fishing the river produces across the full season.

On tailwaters — the South Platte, the Frying Pan, the Missouri, the San Juan — Trico populations are supported by the stable year-round water temperatures and the productive substrate conditions that create dense aquatic insect communities of all species. Tailwater Trico fishing extends across a longer season than freestone river fishing and often produces the most selective and most demanding version of the experience because the fish in these rivers have been educated to the smallest and most precise flies that angling pressure has required them to evaluate across multiple seasons.

How to Fish the Trico Spinner

Trico spinner fall fishing rewards specific preparation and specific technique more than almost any other dry fly situation, and the angler who arrives without having thought through the tactical requirements of the hatch in advance will consistently underperform relative to the angler who has prepared deliberately.

Arrive early. The Trico spinner fall does not wait for the angler who arrives when it feels comfortable. Summer spinner falls on productive Trico rivers can begin as early as 6 am and be substantially over by 8 am — a two-hour window during which the most productive fishing of the day occurs and after which the surface activity that defined the morning drop off completely as spinners are consumed and temperatures begin to drive fish off the surface. An angler who arrives at 8 am having missed the fall entirely will find a beautiful, fishless-appearing river that two hours earlier held actively rising fish from bank to bank. Be on the water an hour before you expect the fall to begin.

Locate feeding fish before the fall begins by observing the river from a bank position rather than wading immediately. During the period immediately before the spinner fall — when male spinners are gathering in swarms above the water but have not yet descended to the surface — identify the flat glides, slow pools, and current margins where the most promising feeding positions exist. These are the areas where Trico spinners will concentrate during the fall, and the fish that occupy them during the fall are already holding in or near those positions in the pre-fall period. Entering the water without this observation period disrupts fish that might otherwise feed within reach throughout the fall.

Position below and slightly to the side of rising fish rather than directly below or above them. The downstream or downstream-and-across position allows upstream presentations to the rising fish without the leader crossing directly over the fish — a sequence that produces drag on the fly and frequently disturbs the fish in flat, clear Trico water. The upstream presentation from a position slightly to the side of the feeding lane delivers the fly to the fish with the leader angled away from the fish's position rather than over it, significantly reducing drag and leader disturbance in the most critical presentation situation.

Cast accuracy is the most important single physical skill in Trico fishing. A Trico Spinner presented twelve inches to the side of a rising fish's position may go entirely unnoticed by a fish that is rising every five seconds to flies arriving directly in its feeding lane. The cast must deliver the fly within two to four inches of the fish's rise position — far enough upstream to allow a natural drag-free drift through the feeding zone, close enough laterally to the fish's position that the fly arrives in the feeding lane rather than beside it. Developing this level of casting accuracy with a small fly on a fine tippet requires practice, and the angler who practices casting accuracy before Trico season begins will fish it measurably better than the angler who attempts to develop the skill on the water during the compressed window of the fall.

Tippet length and diameter are the most important rigging decisions in Trico fishing and the variables most commonly managed incorrectly by anglers new to the technique. Six-X tippet is the minimum appropriate diameter for most Trico situations — anything heavier than 5X produces a stiffness at the fly that prevents the natural drift that selective Trico fish require and generates refusals from fish that would take the same fly on finer tippet. On the most demanding spring creeks and tailwaters during heavy falls, 7X tippet is not excessive but necessary — Henry's Fork guides fishing the Railroad Ranch Trico fall reach for 7X as their standard tippet rather than their backup, because the fish in that river have been educated to tippet diameter over years of angling pressure and respond to anything heavier with refusals that finer tippet eliminates.

Tippet length is as important as diameter. Extending the fine tippet section to 24 to 36 inches beyond the end of the tapered leader reduces the stiffness that the leader taper introduces at the fly and allows the Trico Spinner to drift freely in the film without the subtle drag that a shorter, stiffer connection creates. On flat, slow water where even invisible drag prevents takes from fish that are examining every fly that reaches them, the extended tippet section is the single most effective adjustment available.

The drag-free drift is not merely the goal of Trico fishing — it is the non-negotiable requirement. A Trico Spinner that drags even slightly — that moves across the current at a speed or angle even marginally different from the speed and angle of the naturals drifting around it — will be refused by fish that are eating every fourth natural that reaches them. The fish are not being difficult for its own sake. They are being efficient — rising to every fly that arrives in their feeding lane at the correct speed and angle, ignoring everything else because the volume of naturals on the water during a heavy fall means that the cost of refusing an incorrect presentation is zero. The angler's task is to match that correct speed and angle with every presentation, and the degree to which that task is achieved determines everything about the results of the session.

Managing Visibility

The most common practical challenge in Trico fishing is not casting accuracy, tippet selection, or presentation technique — it is simply seeing the fly. A size 22 or 24 Trico Spinner with white poly wings is essentially invisible at anything more than twenty feet in most light conditions, and the flat, glassy water that produces the best Trico fishing is simultaneously the most difficult water in which to track a tiny fly against the complex light patterns of the surface.

Several strategies address the visibility problem with varying degrees of effectiveness. The dry-dry rig — tying a highly visible attractor pattern, a small Parachute Adams, or a small Klinkhåmer to the tippet twelve to eighteen inches above the Trico Spinner — provides a visual reference that allows the angler to track the general position of the invisible fly by watching the visible one. When the attractor hesitates, the angler sets the hook. This rig is effective but introduces the complication of managing two flies in complex currents and the possibility that the attractor's presence in the drift disturbs the feeding fish.

The alternative — and the preferred approach of the most experienced Trico anglers — is to position close enough to rising fish that the fly is actually visible at the casting distance required, and to set on every rise in the vicinity of where the fly should be rather than on confirmed visual takes. This approach requires discipline — setting the hook on rises that turn out to be to naturals rather than the angler's fly is an inevitable part of Trico fishing at close range — but it produces more takes from the most difficult fish than indicator fly rigs that keep the angler farther from the fish.

Specific sunglass lens colors improve contrast between the small white wings of the Trico Spinner and the water surface significantly. Amber or copper lenses cut glare and increase contrast more effectively than gray lenses on the flat, reflective water of Trico fishing, and the investment in high-quality polarized sunglasses with appropriate lens tint pays more practical dividends during Trico season than on almost any other fishing situation.

The Cluster Pattern

One of the most effective Trico fishing techniques involves not imitating a single spinner but imitating the rafts or clusters of spent spinners that accumulate in surface eddies, calm pockets, and along the edges of current seams during heavy spinner falls — concentrations of naturals so dense that they merge into a single dark mass on the water's surface.

A Trico Cluster pattern — tied to suggest a small group of spent spinners rather than a single individual — is tied larger than a single spinner imitation, typically in sizes 14 through 18, and rides higher and more visibly in the film while presenting a food item that fish feeding on clustered spinners have specifically conditioned themselves to target. During heavy Trico falls on productive rivers, fish that are feeding on clusters — rising to the accumulated mats of spinners in the calm water behind rocks and in current margin eddies — will take a cluster pattern more consistently than a single spinner imitation because the cluster more accurately represents what they are eating in those specific locations.

Carrying both single spinner patterns and cluster patterns is the complete approach to the full range of Trico feeding situations — single patterns for fish feeding on individual spinners in open current, cluster patterns for fish feeding on accumulated spinner mats in calm water and along current edges.

Size Selection

Size is the most consequential variable in Trico fishing and the one that most determines the difference between consistent takes and consistent refusals from fish that are feeding actively and visibly but refusing incorrectly sized presentations.

Size 18 is the largest useful Trico Spinner size and is appropriate for rivers with particularly large Trico populations — the largest individuals of the Tricorythodes genus and for fall Trico fishing when water temperatures have slowed emergence and individual insects tend to be slightly larger than their midsummer counterparts. On rivers known for larger-than-average Trico specimens, size 18 is the right starting point before downsizing based on fish response.

Size 20 is the most important single size in a complete Trico selection and covers the majority of Trico fishing situations on most North American rivers across most of the season. If a single size Trico Spinner must be chosen, size 20 in both black and olive covers more situations on more rivers than any other size.

Size 22 is the technical size — appropriate for the most pressured tailwaters and spring creeks, for late-season conditions on rivers that produce smaller individuals later in the year, and for the demanding situations where size 20 patterns are producing consistent refusals from fish that appear to be eating naturals of identical size. The step from size 20 to size 22 is the adjustment that most frequently converts a frustrating session of refusals into a productive one on the hardest Trico water.

Size 24 and 26 are for the most specialized applications — the ultra-technical tailwaters like the South Platte's Eleven Mile Canyon and the most demanding sections of the San Juan where truly tiny Trico species require the smallest possible imitations on the finest available tippet. These sizes require exceptional tying precision, exceptional presentation skill, and a combination of patience and technical competence that defines the upper end of what is possible in dry fly fishing.

Target Species

Brown trout are the Trico Spinner's most celebrated and most challenging target — the large, educated brown trout that inhabit the flat, clear water where Trico fishing is most productive represent the highest standard of selectivity in freshwater dry fly angling. A brown trout in the 18 to 24-inch range feeding rhythmically on Trico spinners in flat water, refusing every fly that is not exactly right, converting only for a perfectly sized and perfectly presented Trico Spinner on a 7X tippet — that fish is the reason Trico fishing exists as a separate discipline within dry fly angling, and catching it is one of the genuine benchmarks of advanced fly fishing competence.

Rainbow trout on the Henry's Fork, the Madison, and other western rivers with significant Trico populations feed on the morning spinner fall with a selectivity that rivals or exceeds that of eastern brown trout in equivalent situations. Henry's Fork rainbows are among the most technically demanding dry fly targets in the country, and their preference for the Trico spinner fall over other available food sources during the late summer morning hours makes size 20 and 22 Trico Spinners essential equipment for any angler visiting that river during July through October.

Cutthroat trout on rivers with strong Trico populations — the upper Snake River, the flat sections of the Yellowstone River above the lake, and select spring creeks throughout the Greater Yellowstone ecosystem — rise to Trico spinners with a consistency that makes them highly rewarding Trico targets and slightly more accessible than brown or rainbow trout in equivalent situations due to their characteristically more liberal take-to-rise ratio.

Brook trout in eastern spring creeks and limestone streams with Trico populations eat Trico spinners during the morning fall with the eager, deliberate take that characterizes brook trout surface feeding on small insects. Their tendency to hold in specific current margins and feeding lanes during the spinner fall and to rise consistently to naturals makes them accessible and enjoyable Trico targets for anglers developing their technique on less pressured water.

Preparing for the Trico Season

Trico fishing rewards preparation in ways that most other hatches do not require. The combination of early morning timing, small flies, fine tippet, and selective fish makes it the dry fly situation that most consistently punishes the angler who arrives unprepared and rewards the angler who has thought through every variable before reaching the water.

Tie or stock Trico Spinners in sizes 18 through 24 in both black and olive before the season begins — running out of size 22 Trico Spinners during the most productive part of a spinner fall because you only brought four and lost three in streamside vegetation is a specific and avoidable form of misery. Practice tying clinch knots and blood knots in 7X tippet before the season — the combination of fine tippet and small hook eyes that Trico fishing demands is technically challenging even for experienced anglers, and developing that skill at home rather than on the bank during the fall is time well invested.

Research the specific timing of the Trico fall on your target river before the trip — timing varies by several hours between rivers, between seasons on the same river, and between cool and warm years in a way that makes local knowledge from guides, fly shops, and river-specific forums more valuable than general calendar-based timing estimates.

And arrive early. Always arrive early.

Pair it with: A size 22 or 24 Trico Spinner as a trailing fly below a size 16 or 18 Parachute Adams or high-visibility attractor in a dry-dry rig for sessions where fly visibility is the primary challenge. During the fall on rivers with both Trico and Blue Winged Olive activity, carry a size 18 or 20 CDC BWO alongside the Trico Spinner and switch between them as fish indicate a preference through rise rhythm and refusal patterns.

Best rivers: Madison River, Henry's Fork, Delaware River, Beaverkill River, South Platte River, Frying Pan River, Missouri River, San Juan River, Bighorn River, Armstrong Spring Creek, Nelson's Spring Creek, DePuy's Spring Creek, Yellow Breeches Creek, Spring Creek, Gallatin River, upper Yellowstone River, Green River