

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
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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
Yellowstone River
South Central Montana
Caddis are prolific on the Yellowstone
Gallatin River
Southwest Montana
Evening caddis hatches are reliable
Missouri River
Central Montana
Good caddis hatches in summer
Bighorn River
Southeast Montana
Summer caddis hatches
Arkansas River
Upper Arkansas Valley / Central Mountains
Matches prolific caddis hatches June through September evenings
Colorado River
Grand County / Northern Mountains
Essential during summer evening caddis hatches
Frying Pan River
Roaring Fork Valley / Central Mountains
Caddis dry for summer evenings, most effective on the lower river
Gunnison River
Western Slope / Black Canyon Country
Matches prolific summer caddis hatches in the Gorge
South Platte River
Front Range / South Park
Primary caddis pattern for Deckers and Eleven Mile sections
Snake River
Northwest Wyoming / Jackson Hole
Evening caddis hatches are explosive on the Snake
Bighorn River (Wyoming)
North Central Wyoming
Evening caddis hatches through the Thermopolis section
New Fork River
Western Wyoming / Wind River Range
Evening caddis hatches in the meadow sections
South Fork Snake River
Eastern Idaho
Evening caddis hatches in the canyon
Salmon River
Central Idaho
Evening caddis; cutthroat are aggressive caddis feeders
South Fork Boise River
Southwestern Idaho
Evening caddis hatches in the canyon
Crooked River
Central Oregon
Caddis present but less significant than on larger rivers
Metolius River
Central Oregon (Cascades)
Standard caddis imitation. Effective throughout summer months.
McKenzie River
Willamette Valley / Cascades
THE fly on the McKenzie. Green body #12-14. Skate and twitch.
John Day River
Eastern Oregon (High Desert / Blue Mountains)
Caddis pattern for upper river trout water
Yakima River
Central Washington
Essential during prolific evening caddis hatches
Methow River
North Central Washington, Okanogan County
THE fly for Methow evening caddis, indispensable
Skagit River
Northwest Washington, Skagit County
Evening caddis hatches on the upper Skagit
Klickitat River
South Central Washington, Klickitat County
Caddis dry for upper river evening hatches
Lower Sacramento River
Northern California / Shasta County
#1 pattern during October Caddis hatch; evening fishing July-October
McCloud River
Northern California / Shasta County
Caddis dry for evening hatches
Upper Sacramento River
Northern California / Siskiyou and Shasta Counties
Essential caddis dry for evening hatches
Pit River
Northern California / Shasta County
#1 pattern; prolific caddis hatches year-round
Truckee River
Eastern Sierra / Nevada and Placer Counties
Caddis dry for summer evening hatches
Upper Klamath River
Northern California / Siskiyou County
Caddis dry for resident trout; prolific hatches
Truckee River
Western Nevada / Washoe County
Matches prolific caddis hatches June-September evenings
East Fork Carson River
Western Nevada / Douglas County
Matches dominant caddis hatches June-September
Jarbidge River
Northern Nevada / Elko County / Jarbidge Wilderness
Elk Hair Caddis for pocket water
Ruby Mountains / Lamoille Creek
Northern Nevada / Elko County / Ruby Mountains
Elk Hair Caddis for alpine streams
Bruneau River
Northern Nevada / Elko County
Caddis dry fly for evening hatches
Great Basin NP Streams
Eastern Nevada / White Pine County / Great Basin National Park
Elk Hair Caddis for alpine streams
Rio Grande
Northern New Mexico / Taos County
#1 spring pattern during the legendary caddis hatch. Elk Hair Caddis 14-16.
Pecos River
North-Central New Mexico / San Miguel & Santa Fe Counties
Essential for prolific summer caddis hatches. Elk Hair Caddis 14-16.
Rio Chama
North-Central New Mexico / Rio Arriba County
Caddis dry for summer evening hatches
Colorado River at Lees Ferry
Northern Arizona / Coconino County
Caddis dry for summer evening emergences
Oak Creek
Central Arizona / Oak Creek Canyon
Elk Hair Caddis for summer evening emergences
East Fork Black River
Eastern Arizona / White Mountains
Elk Hair Caddis for summer caddis hatches
Chevelon Creek
Central Arizona / Mogollon Rim
Elk Hair Caddis for summer caddis hatches
Davidson River
Western North Carolina / Pisgah National Forest
Essential caddis dry, the #1 dry fly pattern April through October
Tuckasegee River
Western North Carolina / Jackson County
Primary caddis pattern for summer evening emergences
Nantahala River
Western North Carolina / Macon County
Primary caddis dry for prolific summer hatches
Watauga River
Northwestern North Carolina / Watauga County
Essential caddis dry April through October
Wilson Creek
Western North Carolina / Caldwell County
Primary caddis pattern
Deep Creek
Western North Carolina / Great Smoky Mountains National Park
Essential caddis dry for abundant hatches
Linville River
Western North Carolina / Avery County
Primary caddis pattern for fast water
South Toe River
Western North Carolina / Yancey County
Essential caddis dry April through October
French Broad River
Western North Carolina / Asheville Area
Caddis dry for trout sections and smallmouth surface feeding
Mitchell River
Northwestern North Carolina / Surry County
Caddis dry for both trout and smallmouth
West Branch Penobscot River
North-Central Maine / Piscataquis County
Elk Hair Caddis in sizes 14-16 for prolific summer caddis emergences.
Kennebago River
Western Maine / Franklin County
Elk Hair Caddis in sizes 14-16 for prolific evening caddis emergences.
Roach River
North-Central Maine / Piscataquis County
Elk Hair Caddis in sizes 14-16 for evening caddis emergences.
Crooked River
Southern Maine / Cumberland and Oxford Counties
Elk Hair Caddis in sizes 14-16 for caddis hatches from May through July.
Moose River (Jackman)
Northwestern Maine / Somerset County
Elk Hair Caddis in sizes 14-16 for evening caddis emergences in the tailwater.
Androscoggin River
Northern White Mountains / Coos County
Essential for the legendary alder fly hatch near Errol. Size 10-14. Peak in June.
Upper Connecticut River
Connecticut Lakes Region / Pittsburg
Caddis dry for moderate summer hatches. Size 14-18.
Pemigewasset River
White Mountains / Grafton County
Essential for prolific summer caddis hatches. Evening fishing. Size 14-16.
Swift River
White Mountains / Kancamagus Highway
Caddis dry for summer evening hatches. Size 14-16.
Ellis River
Mount Washington Valley / Carroll County
Caddis dry for productive summer hatches. Size 14-16.
Ammonoosuc River
White Mountains / Grafton County
Essential for prolific summer caddis hatches. Size 14-18.
Baker River
White Mountains / Grafton County
Caddis dry for summer evening hatches. Size 14-18.
Mascoma River
Upper Valley / Grafton County
Caddis dry for productive summer hatches. Size 14-18.
Souhegan River
Southern New Hampshire / Hillsborough County
Caddis dry for dominant summer hatches. Size 14-18.
Battenkill River
Southern Vermont / Bennington County
Matches prolific summer caddis hatches. Evening emergences June through August.
White River
Central Vermont / White River Valley
Essential for excellent summer caddis hatches. Evening fishing June-July.
Winooski River
Northern Vermont / Chittenden County
Matches summer caddis hatches. Evening emergences productive.
Lamoille River
Northern Vermont / Lamoille County
Caddis dry fly for summer evening hatches.
Dog River
Central Vermont / Washington County
Small caddis patterns for pocket water. Size 14-16.
Deerfield River (Upper)
Southern Vermont / Windham County
Caddis dry for summer hatches.
Walloomsac River
Southern Vermont / Bennington County
Caddis dry for summer evening hatches.
Mettawee River
Western Vermont / Rutland County
Caddis dry for summer hatches.
Otter Creek
Western Vermont / Addison County
Caddis patterns for summer.
New Haven River
Central Vermont / Addison County
Essential for prolific spring caddis hatches, best time to fish New Haven.
Penns Creek
Central Pennsylvania / Centre County
Caddis dry for evening hatches
Little Juniata River
Central Pennsylvania / Blair County
Caddis dry for evening hatches
Big Fishing Creek
North Central Pennsylvania / Columbia County
Caddis dry for evenings
Yellow Breeches Creek
South Central Pennsylvania / Cumberland County
Caddis dry for evening hatches
Kettle Creek
North Central Pennsylvania / Clinton County
Caddis dry for evenings
Slate Run
North Central Pennsylvania / Lycoming County
Caddis dry for evenings
Tulpehocken Creek
Southeastern Pennsylvania / Berks County
Caddis dry for evenings
Related Dry Fly Patterns
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
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
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
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
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
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.