Elk Hair Caddis fly pattern — close-up detail
Dry Fly

Elk Hair Caddis

Al Troth's iconic caddis imitation is a must-have on every Montana river. The elk hair wing provides excellent flotation, and the pattern effectively matches adult caddisflies throughout the season. Dead-drift, skate, or twitch it; all methods produce fish. The Elk Hair Caddis is one of those rare patterns that works from the moment caddisflies start appearing in spring through the last hatches of fall. The tent-shaped elk hair wing perfectly mimics the profile of a resting adult caddis, while the palmered hackle gives the fly exceptional buoyancy and creates the impression of legs touching the surface. Its durability is legendary; a well-tied Elk Hair Caddis can take dozens of fish before needing replacement. In Montana, caddis hatches are prolific on every major river. Mother's Day caddis hatches on the Yellowstone in late April and May are among the most anticipated events of the season. The Elk Hair Caddis is equally effective on the rock gardens of the Gallatin, the braided channels of the upper Madison, and the tailwater sections of the Missouri. Vary the body color between tan, olive, and green to match local populations.

Pattern Details

Type
Dry Fly
Seasons
spring, summer, fall
Hook Sizes
#12-18
Hook Type
Standard dry fly hook
Tying Difficulty
Intermediate
Imitates
Adult caddisflies (Hydropsyche, Brachycentrus, and other Trichoptera species)

Recipe & Materials

Hook
TMC 100 or Dai-Riki 300, sizes 12-18Shop
Thread
8/0 tan or olive
Rib
Fine gold wire
Body
Hare's ear dubbing or synthetic dubbing (tan, olive, or green)
Hackle
Brown or ginger, palmered over bodyShop
Wing
Natural elk hair, stacked and tied tent-styleShop

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Technique & Presentation

The Elk Hair Caddis is one of the most versatile dry flies you can fish, and technique matters as much as pattern selection. Start with a dead drift, presenting the fly upstream or across-stream with a drag-free float. This imitates a spent or resting adult caddis on the surface.

When trout are chasing skittering caddis, add motion to your presentation. A downstream or across-stream cast followed by gentle rod-tip lifts creates an enticing skating action that drives trout wild. This technique is particularly effective during evening caddis blizzards on the Madison and Yellowstone. You can also impart a subtle twitch at the end of a dead drift to trigger a strike from a following fish.

As a searching pattern, the Elk Hair Caddis excels when prospecting pocket water, riffles, and bank-side eddies. It floats high enough to serve as the top fly in a dry-dropper rig with a small nymph or emerger trailing below. Use 4X or 5X tippet in most situations, dropping to 6X only on very still, clear water.

History & Origin

The Elk Hair Caddis was developed in 1957 by Al Troth, a Pennsylvania fly tyer who later moved to Dillon, Montana. Troth was seeking a more durable and effective caddis imitation than the existing patterns of the day. His innovation of using stacked elk hair for the wing created a fly with a perfect tent-shaped caddis profile and exceptional floating ability.

Troth's pattern gained widespread recognition after being featured in outdoor publications in the 1970s. By the 1980s, it had become the standard adult caddis imitation across North America. Al Troth tied flies commercially in his Dillon, Montana workshop for decades, and the Elk Hair Caddis remains his most enduring legacy. It consistently ranks among the top five most popular dry flies in the world.

Where to Fish This Fly

Madison River

Southwest Montana

Excellent during evening caddis

Recommendedsummer

Yellowstone River

South Central Montana

Caddis are prolific on the Yellowstone

summer

Gallatin River

Southwest Montana

Evening caddis hatches are reliable

Recommendedsummer

Missouri River

Central Montana

Good caddis hatches in summer

summer

Bighorn River

Southeast Montana

Summer caddis hatches

summer

Arkansas River

Upper Arkansas Valley / Central Mountains

Matches prolific caddis hatches June through September evenings

Recommendedsummer

Colorado River

Grand County / Northern Mountains

Essential during summer evening caddis hatches

Recommendedsummer

Frying Pan River

Roaring Fork Valley / Central Mountains

Caddis dry for summer evenings, most effective on the lower river

Recommendedsummer

Gunnison River

Western Slope / Black Canyon Country

Matches prolific summer caddis hatches in the Gorge

Recommendedsummer

South Platte River

Front Range / South Park

Primary caddis pattern for Deckers and Eleven Mile sections

Recommendedsummer

Snake River

Northwest Wyoming / Jackson Hole

Evening caddis hatches are explosive on the Snake

Recommendedsummer

Bighorn River (Wyoming)

North Central Wyoming

Evening caddis hatches through the Thermopolis section

Recommendedsummer

New Fork River

Western Wyoming / Wind River Range

Evening caddis hatches in the meadow sections

Recommendedsummer

South Fork Snake River

Eastern Idaho

Evening caddis hatches in the canyon

Recommendedsummer

Salmon River

Central Idaho

Evening caddis; cutthroat are aggressive caddis feeders

Recommendedsummer

South Fork Boise River

Southwestern Idaho

Evening caddis hatches in the canyon

Recommendedsummer

Crooked River

Central Oregon

Caddis present but less significant than on larger rivers

summer

Metolius River

Central Oregon (Cascades)

Standard caddis imitation. Effective throughout summer months.

Recommendedsummer

McKenzie River

Willamette Valley / Cascades

THE fly on the McKenzie. Green body #12-14. Skate and twitch.

Recommendedspring

John Day River

Eastern Oregon (High Desert / Blue Mountains)

Caddis pattern for upper river trout water

summer

Yakima River

Central Washington

Essential during prolific evening caddis hatches

Recommendedsummer

Methow River

North Central Washington, Okanogan County

THE fly for Methow evening caddis, indispensable

Recommendedsummer

Skagit River

Northwest Washington, Skagit County

Evening caddis hatches on the upper Skagit

Recommendedsummer

Klickitat River

South Central Washington, Klickitat County

Caddis dry for upper river evening hatches

Recommendedsummer

Lower Sacramento River

Northern California / Shasta County

#1 pattern during October Caddis hatch; evening fishing July-October

Recommendedsummer

McCloud River

Northern California / Shasta County

Caddis dry for evening hatches

Recommendedsummer

Upper Sacramento River

Northern California / Siskiyou and Shasta Counties

Essential caddis dry for evening hatches

Recommendedsummer

Pit River

Northern California / Shasta County

#1 pattern; prolific caddis hatches year-round

Recommendedsummer

Truckee River

Eastern Sierra / Nevada and Placer Counties

Caddis dry for summer evening hatches

Recommendedsummer

Upper Klamath River

Northern California / Siskiyou County

Caddis dry for resident trout; prolific hatches

Recommendedsummer

Truckee River

Western Nevada / Washoe County

Matches prolific caddis hatches June-September evenings

Recommendedsummer

East Fork Carson River

Western Nevada / Douglas County

Matches dominant caddis hatches June-September

Recommendedsummer

Jarbidge River

Northern Nevada / Elko County / Jarbidge Wilderness

Elk Hair Caddis for pocket water

Recommendedsummer

Ruby Mountains / Lamoille Creek

Northern Nevada / Elko County / Ruby Mountains

Elk Hair Caddis for alpine streams

Recommendedsummer

Bruneau River

Northern Nevada / Elko County

Caddis dry fly for evening hatches

Recommendedspring

Great Basin NP Streams

Eastern Nevada / White Pine County / Great Basin National Park

Elk Hair Caddis for alpine streams

Recommendedsummer

Rio Grande

Northern New Mexico / Taos County

#1 spring pattern during the legendary caddis hatch. Elk Hair Caddis 14-16.

Recommendedspring

Pecos River

North-Central New Mexico / San Miguel & Santa Fe Counties

Essential for prolific summer caddis hatches. Elk Hair Caddis 14-16.

Recommendedsummer

Rio Chama

North-Central New Mexico / Rio Arriba County

Caddis dry for summer evening hatches

Recommendedsummer

Colorado River at Lees Ferry

Northern Arizona / Coconino County

Caddis dry for summer evening emergences

Recommendedsummer

Oak Creek

Central Arizona / Oak Creek Canyon

Elk Hair Caddis for summer evening emergences

Recommendedsummer

East Fork Black River

Eastern Arizona / White Mountains

Elk Hair Caddis for summer caddis hatches

Recommendedsummer

Chevelon Creek

Central Arizona / Mogollon Rim

Elk Hair Caddis for summer caddis hatches

Recommendedsummer

Davidson River

Western North Carolina / Pisgah National Forest

Essential caddis dry, the #1 dry fly pattern April through October

Recommendedsummer

Tuckasegee River

Western North Carolina / Jackson County

Primary caddis pattern for summer evening emergences

Recommendedsummer

Nantahala River

Western North Carolina / Macon County

Primary caddis dry for prolific summer hatches

Recommendedsummer

Watauga River

Northwestern North Carolina / Watauga County

Essential caddis dry April through October

Recommendedsummer

Wilson Creek

Western North Carolina / Caldwell County

Primary caddis pattern

Recommendedsummer

Deep Creek

Western North Carolina / Great Smoky Mountains National Park

Essential caddis dry for abundant hatches

Recommendedsummer

Linville River

Western North Carolina / Avery County

Primary caddis pattern for fast water

Recommendedsummer

South Toe River

Western North Carolina / Yancey County

Essential caddis dry April through October

Recommendedsummer

French Broad River

Western North Carolina / Asheville Area

Caddis dry for trout sections and smallmouth surface feeding

Recommendedsummer

Mitchell River

Northwestern North Carolina / Surry County

Caddis dry for both trout and smallmouth

Recommendedsummer

West Branch Penobscot River

North-Central Maine / Piscataquis County

Elk Hair Caddis in sizes 14-16 for prolific summer caddis emergences.

Recommendedsummer

Kennebago River

Western Maine / Franklin County

Elk Hair Caddis in sizes 14-16 for prolific evening caddis emergences.

Recommendedsummer

Roach River

North-Central Maine / Piscataquis County

Elk Hair Caddis in sizes 14-16 for evening caddis emergences.

Recommendedsummer

Crooked River

Southern Maine / Cumberland and Oxford Counties

Elk Hair Caddis in sizes 14-16 for caddis hatches from May through July.

Recommendedsummer

Moose River (Jackman)

Northwestern Maine / Somerset County

Elk Hair Caddis in sizes 14-16 for evening caddis emergences in the tailwater.

Recommendedsummer

Androscoggin River

Northern White Mountains / Coos County

Essential for the legendary alder fly hatch near Errol. Size 10-14. Peak in June.

Recommendedsummer

Upper Connecticut River

Connecticut Lakes Region / Pittsburg

Caddis dry for moderate summer hatches. Size 14-18.

summer

Pemigewasset River

White Mountains / Grafton County

Essential for prolific summer caddis hatches. Evening fishing. Size 14-16.

Recommendedsummer

Swift River

White Mountains / Kancamagus Highway

Caddis dry for summer evening hatches. Size 14-16.

Recommendedsummer

Ellis River

Mount Washington Valley / Carroll County

Caddis dry for productive summer hatches. Size 14-16.

Recommendedsummer

Ammonoosuc River

White Mountains / Grafton County

Essential for prolific summer caddis hatches. Size 14-18.

Recommendedsummer

Baker River

White Mountains / Grafton County

Caddis dry for summer evening hatches. Size 14-18.

Recommendedsummer

Mascoma River

Upper Valley / Grafton County

Caddis dry for productive summer hatches. Size 14-18.

Recommendedsummer

Souhegan River

Southern New Hampshire / Hillsborough County

Caddis dry for dominant summer hatches. Size 14-18.

Recommendedsummer

Battenkill River

Southern Vermont / Bennington County

Matches prolific summer caddis hatches. Evening emergences June through August.

Recommendedsummer

White River

Central Vermont / White River Valley

Essential for excellent summer caddis hatches. Evening fishing June-July.

Recommendedsummer

Winooski River

Northern Vermont / Chittenden County

Matches summer caddis hatches. Evening emergences productive.

Recommendedsummer

Lamoille River

Northern Vermont / Lamoille County

Caddis dry fly for summer evening hatches.

Recommendedsummer

Dog River

Central Vermont / Washington County

Small caddis patterns for pocket water. Size 14-16.

Recommendedsummer

Deerfield River (Upper)

Southern Vermont / Windham County

Caddis dry for summer hatches.

Recommendedsummer

Walloomsac River

Southern Vermont / Bennington County

Caddis dry for summer evening hatches.

Recommendedsummer

Mettawee River

Western Vermont / Rutland County

Caddis dry for summer hatches.

Recommendedsummer

Otter Creek

Western Vermont / Addison County

Caddis patterns for summer.

Recommendedsummer

New Haven River

Central Vermont / Addison County

Essential for prolific spring caddis hatches, best time to fish New Haven.

Recommendedspring

Penns Creek

Central Pennsylvania / Centre County

Caddis dry for evening hatches

Recommendedsummer

Little Juniata River

Central Pennsylvania / Blair County

Caddis dry for evening hatches

Recommendedsummer

Big Fishing Creek

North Central Pennsylvania / Columbia County

Caddis dry for evenings

Recommendedsummer

Yellow Breeches Creek

South Central Pennsylvania / Cumberland County

Caddis dry for evening hatches

Recommendedsummer

Kettle Creek

North Central Pennsylvania / Clinton County

Caddis dry for evenings

Recommendedsummer

Slate Run

North Central Pennsylvania / Lycoming County

Caddis dry for evenings

Recommendedsummer

Tulpehocken Creek

Southeastern Pennsylvania / Berks County

Caddis dry for evenings

Recommendedsummer

Related Dry Fly Patterns

Parachute Adams fly pattern
Dry Fly
springsummerfall

Parachute Adams

The most versatile dry fly ever created. The Parachute Adams imitates a wide range of mayflies and serves as an effective searching pattern when no specific hatch is occurring. The white parachute post makes it easy to track on the water. Originally tied with conventional upright wings, the parachute version wraps the hackle horizontally around the post, allowing the fly to land flush on the surface with a more realistic silhouette. This low-riding profile is why many experienced anglers prefer it over the standard Adams. The mixed brown and grizzly hackle suggests the mottled coloring of countless mayfly species, from tiny Baetis to larger Callibaetis. On Montana waters, the Parachute Adams is the quintessential searching pattern. When you arrive at the river and nothing is hatching, tie on a Parachute Adams in size #14 or #16 and start prospecting. During active hatches, sizing down to match the naturals makes this fly deadly. It works on every Montana river from the riffles of the Madison to the spring creek-like waters of the Missouri below Holter Dam.

Stimulator fly pattern
Dry Fly
summerfall

Stimulator

An outstanding attractor dry fly and stonefly imitation. The Stimulator excels as a top fly in a dry-dropper rig. Larger sizes (#6-8) match salmonflies and golden stones, while smaller sizes (#12-14) suggest various stoneflies and caddis. The Stimulator's genius lies in its buoyancy and suggestive profile. The combination of a heavily palmered hackle, elk hair wing, and robust body allows it to ride high on turbulent water where lesser flies would drown. The swept-back wing silhouette works as both a stonefly and large caddis imitation, making it effective even when no specific insect is hatching. Trout see the Stimulator and recognize it as a substantial, calorie-rich meal worth rising for. In Montana, the Stimulator truly shines during stonefly season on the Madison, Yellowstone, and Gallatin rivers. Tie on a size #6 orange Stimulator during the salmonfly hatch in late June and fish it tight to the banks. As summer progresses, switch to smaller sizes in yellow for golden stones. The Stimulator also serves as an excellent indicator fly for a heavy nymph dropper, especially when wading pocket water and riffles where it can be challenging to track a strike indicator.

Chubby Chernobyl fly pattern
Dry Fly
summerfall

Chubby Chernobyl

A modern foam attractor pattern that has become a Montana staple. Virtually unsinkable, the Chubby floats heavy nymph droppers and draws aggressive strikes from trout looking for a large, easy meal. Available in numerous colors. The Chubby Chernobyl represents the evolution of the foam hopper and stonefly genre. Its layered foam body creates a nearly indestructible fly that requires no floatant and rides high on even the roughest water. The rubber legs provide enticing movement, and the flash wing catches light in a way that grabs attention from trout holding deep. Whether tied in tan, purple, pink, or any other color, the Chubby simply produces fish. Montana guides have embraced the Chubby Chernobyl as their go-to dry-dropper indicator fly, and for good reason. It supports one or even two heavy nymphs without sinking, it is visible at long distances, and trout eat it with startling aggression. On the Madison, Yellowstone, and Gallatin rivers, more fish are likely caught with a Chubby on top than any other dry fly. Its effectiveness extends from early July through October, covering the heart of Montana's fishing season.

Purple Haze fly pattern
Dry Fly
springsummerfall

Purple Haze

A Montana-born variation of the Parachute Adams with purple dubbing. Created in the Gallatin Valley, this pattern has become a regional favorite that outperforms the standard Adams on many days, particularly during BWO and PMD hatches. The Purple Haze takes the proven Parachute Adams template and adds a subtle twist: a body of purple dubbing that seems to trigger something in trout that the standard gray does not. While purists may argue the color is unnatural, the results speak for themselves. Montana anglers have reported for years that the Purple Haze consistently outfishes the standard Adams, particularly on rivers that receive heavy fishing pressure. Theories about why the purple works vary. Some believe that the color more accurately represents the UV spectrum reflected by natural mayflies. Others suggest that the slightly different hue simply stands out enough on pressured water to be noticed without being refused. Whatever the reason, the Purple Haze has earned its place in the top tier of Montana dry flies. It is especially effective on the Gallatin, Madison, and Yellowstone rivers from late spring through early fall.

X-Caddis fly pattern
Dry Fly
springsummer

X-Caddis

Craig Mathews' brilliant caddis emerger pattern sits in the surface film, imitating a caddis struggling to break through the meniscus. Deadly during caddis hatches when fish refuse higher-riding patterns. The trailing shuck is key to its effectiveness. The X-Caddis fills a critical gap in the caddis life cycle that most fly boxes lack. While traditional dry flies like the Elk Hair Caddis ride high on the surface, the X-Caddis sits flush in the film with its body partially submerged and a trailing Z-lon shuck extending behind. This precisely imitates the moment when a caddis pupa breaks through the surface and begins to shed its pupal shuck, the most vulnerable stage for the insect and the moment when trout feed with the least caution. On Montana's caddis-rich rivers, the X-Caddis can make the difference between a frustrating day of refusals and a banner day of steady action. When you see trout rising during a caddis hatch but refusing your Elk Hair Caddis, the X-Caddis is the answer. It is particularly effective on the Yellowstone during the Mother's Day caddis hatch, on the Madison during summer evening hatches, and anywhere trout have become educated to conventional caddis patterns.

PMD Comparadun fly pattern
Dry Fly
summer

PMD Comparadun

A flush-floating mayfly imitation that excels during Pale Morning Dun hatches. The deer hair wing creates a realistic silhouette, and the pattern sits low in the film like a natural dun. Essential during PMD hatches on the Missouri and Madison. The Comparadun design is one of the most elegant solutions in dry fly fishing. By using a fan-shaped deer hair wing instead of traditional hackle, the fly sits directly on the water surface with its body in the film. This creates a silhouette that is nearly indistinguishable from a natural mayfly dun when viewed from below, exactly the perspective that matters to a feeding trout. The PMD version, tied in pale yellow and olive, is one of the most important patterns for Montana's prolific Pale Morning Dun hatches. PMD hatches on Montana's premier rivers are events that every serious fly angler should experience. On the Missouri River below Holter Dam, PMD hatches from late June through August produce some of the best dry fly fishing in North America. The Madison River's upper sections also host excellent PMD activity. During these hatches, trout can become excruciatingly selective, and the low-riding Comparadun is often the pattern that cracks the code when parachute and traditional dun patterns fail.