Skip to content
The Woolly Gentleman logo
The Woolly Gentleman
FlyboxTiersWhy These WorkJournalFind Your FliesThe CraftThe Story
Home/Flybox/Trico Spinner
Trico SpinnerDry Flyadvanced

Rocky Mountain West

Trico Spinner

Flybox sourcing profile

No TWG price or checkout is active. Use this page to validate the fly, then source it through the mapped tier or trusted fly shops.

Available Sizes#18 - #24
Color Variations
Black/White

Pattern Ledger

Source Trico Spinner

Want help finding this exact pattern or a tied-to-order equivalent? Join the sourcing ledger and we will prioritize demand by water, species, and pattern.

Trusted Sourcing Ledger

Find this fly from an independent source

Exact links are published only after the product name and live page are checked. TWG does not sell the fly, set the price, or control stock, shipping, or returns.

Exact source still under review

We have not published an exact product link for this pattern yet. The directory below can help locate a regional specialist, but it is not proof that the exact fly is currently listed.

Regional source directory

Regional shop

Taos Fly Shop

Matched on Rocky Mountain West, dry flies, trout. New Mexico/Southwest trout shop lead for Rio Grande, San Juan, Pecos, and high desert water.

Rocky Mountain Westdry flies
Specialist source

Rocky Mountain Fly Design

Matched on Rocky Mountain West, dry flies, trout. Colorado tier and shop lead for Rocky Mountain trout, bass, and predator patterns.

Rocky Mountain Westdry flies
Broad catalog

Fly Fish Food

Matched on dry flies, trout, mayfly. Strong technical tying and trout catalog coverage, especially nymphs, dries, and stillwater flies.

dry fliestrout
Broad catalog

Fulling Mill Flies

Matched on dry flies, trout, dry. Large pattern house with broad freshwater and saltwater fly categories.

dry fliestrout

These are independent businesses. A listing does not imply endorsement or partnership. TWG currently receives no purchase commission from these links. Any future paid or affiliate relationship will be labeled beside the relevant link.

Every summer morning on western tailwaters, millions of Trico mayflies mate, die, and fall to the water with their wings spread like tiny crucifixes. The trout line up and eat them with metronomic rhythm, completely ignoring anything that is not a perfect size #20-24 spent spinner drifting without a hint of drag. This is either the most technical, rewarding dry fly fishing on earth or a punishment designed by someone who hates anglers. Possibly both.

Quick Facts

TypeDry Fly
Difficultyadvanced
SeasonsSummer
Target SpeciesRainbow Trout, Brown Trout
Sizes#18 - #24
Best LocationsMissouri River, MT; Big Horn River, MT; South Platte River, CO

Where to Fish It

Missouri River

MT · Tailwater

Big Horn River

MT · Tailwater

South Platte River

CO · Tailwater

Loading map...

Related Reading

seasonal playbook

The Summer Guide: Long Days and Willing Fish

Summer is fly fishing's season of abundance. Sixteen-hour days, prolific hatches, aggressive fish, and the full spectrum from mountain trout to saltwater flats. This is your playbook for making the most of the warmest, longest, most generous months of the fishing year.

hatch guide

The Complete Guide to Mayfly Hatches

Mayflies are the foundation of trout-stream entomology. This guide covers every major hatch — BWOs, PMDs, Green Drakes, Sulphurs, Tricos, and Hendricksons — with the biology, timing, and fly selections you need to fish them effectively across the country.

You Might Also Like

Parachute AdamsDry Flybeginner

Parachute Adams

Flybox

Find a tier or trusted source

Rocky Mountain West

#12 - #22

Tier reference: Andy Carlson

The universal dry fly. Grizzly hackle, white post, dubbed body. If you cannot identify the hatch, tie on an Adams.

Standard GrayFemale (yellow egg sac)

Rainbow Trout · Brown Trout · Cutthroat Trout · Brook Trout · Mountain Whitefish

SprSumFallWin
Source & Details →
Elk Hair CaddisDry Flybeginner

Elk Hair Caddis

Flybox

Find a tier or trusted source

Rocky Mountain West

#12 - #18

Tier reference: Chris Krueger

Al Troth's iconic caddis imitation. Elk hair wing, palmered hackle. Floats like a cork in fast water.

TanOliveBlack

Rainbow Trout · Brown Trout · Cutthroat Trout · Brook Trout

SprSumFallWin
Source & Details →
StimulatorDry Flybeginner

Stimulator

Flybox

Find a tier or trusted source

Rocky Mountain West

#8 - #16

Oversized attractor dry that suggests stoneflies, caddis, and hoppers depending on size and color. A western staple.

OrangeYellowRoyalOlive

Rainbow Trout · Brown Trout · Cutthroat Trout · Brook Trout

SprSumFallWin
Source & Details →
Pale Morning Dun (PMD)Dry Flyintermediate

Pale Morning Dun (PMD)

Flybox

Find a tier or trusted source

Rocky Mountain West

#14 - #20

Ephemerella mayfly imitation in pale yellow. One of the most important western hatches from June through August.

Pale YellowSulphurRusty

Rainbow Trout · Brown Trout · Cutthroat Trout

SprSumFallWin
Source & Details →
Green DrakeDry Flyintermediate

Green Drake

Flybox

Find a tier or trusted source

Rocky Mountain West

#10 - #14

Large mayfly imitation for the Ephemera and Drunella hatches. Size #10-12. Brief but legendary hatches in June and July.

Olive/GreenDark OliveGray/Olive

Rainbow Trout · Brown Trout · Cutthroat Trout

SprSumFallWin
Source & Details →
Sparkle DunDry Flyintermediate

Sparkle Dun

Flybox

Find a tier or trusted source

Rocky Mountain West

#14 - #22

Craig Mathews' flush-floating mayfly emerger. Deer hair wing, trailing Z-lon shuck. Sits in the film like a natural.

OliveTanGrayRusty

Rainbow Trout · Brown Trout · Cutthroat Trout

SprSumFallWin
Source & Details →

The Woolly Gentleman

Every Fly Has a River · Every River Has a Tier

America's premium flybox and field ledger for choosing the right pattern before you buy.

Join the mailing list. We will tell you what is hatching.

The Flybox

  • Open the Flybox
  • Tiers
  • For Tiers & Fly Shops
  • The Science
  • Why These Work
  • Find Your Flies
  • The Flybox
  • The Journal

Fishing Regions

  • Gulf Coast & Emerald Coast
  • Florida Keys
  • Northeast & Mid-Atlantic
  • Rocky Mountain West
  • Pacific Northwest
  • All 10 Regions

The Gentleman

  • Our Story
  • Nationwide
  • hello@thewoollygentleman.com

© 2026 The Woolly Gentleman. All rights reserved.

Privacy Policy|Terms & Conditions

Chosen with proof. Sourced with care.