Snake River Cutthroat Trout
A regional finespotted variant of the Yellowstone cutthroat, native to a small slice of the upper Snake River drainage in Wyoming and Idaho.
Anglers travel from across the country to fish for them — they rise hard to dry flies, run big in the mainstem and tailwater stretches, and still dominate their home water in a way few native trout can claim.
Also known as Snake River Finespotted Cutthroat Trout, Finespotted Cutthroat, Snake River Cutthroat
- Covered in profuse, very small black spots scattered evenly across the body, dorsal, adipose, and caudal fins — the finest spotting of any western cutthroat and the key separator from the larger, sparser spots of the Yellowstone form.
- Brown-and-yellow body with a silvery cast and white belly; pectoral, pelvic, and anal fins often show vivid red or orange, and many fish carry a purplish wash along the flanks.
- Wears the diagnostic red-orange slash under the lower jaw shared by all cutthroat. No white tips on the paired fins.
- Most river fish run 12–20 inches; mainstem and South Fork populations commonly produce 15–25 inch fish, with the upper end pushing 28 inches and historic records to 31–33 inches.
What to know
Habitat Distribution
- Native to the upper Snake River and its tributaries between Jackson Lake and Palisades Reservoir, plus parts of the Wind/Bighorn drainage. Stocked outside that core range as a sport fish, where introduced fish occasionally reach trophy size in productive tailwaters.
- A cold-water fish that does best below 50°F — slower-growing than most trout but long-lived, with eight to ten year-classes possible in good water.
- Lives across a wide spectrum of water types: large rivers and tailwaters, spring creeks, and small tributary streams. Less suited to steep, high-gradient mountain streams than some other cutthroat — those upper reaches tend to favor the large-spotted Yellowstone form.
Specific Spots
- Through summer, fish stack up in deep riffles and runs with overhead cover, sliding short distances up or down to intercept drift.
- When flows blow out in spring runoff, look to the soft edges — side channels, grassy banks, back eddies, and the still 'frog water' along the margins where fish duck out of heavy current.
- Cut banks, downed cottonwoods, and braided side channels hold the larger fluvial fish, especially in tailwater stretches where structure breaks the flow.
- As temperatures drop in fall, deep mainstem pools become wintering water — concentration spots worth targeting through the cold months.
Snake River Cutthroat Trout FAQ
Answers from onWater's species guide.
What are the best lures and bait for Snake River Cutthroat Trout?
Inline spinners in sizes #1–#3, Mepps, Panther Martin, Blue Fox, Rooster Tail, are the workhorse for river and stream fish. Silver blades tend to outproduce gold for cutthroat.
What flies work for Snake River Cutthroat Trout?
Big bushy attractors are the calling card, Stimulators, Chubby Chernobyls, Royal Wulffs, Humpies, and foam-bodied hoppers. These fish will eat a size-4 dry without hesitation, especially during the salmonfly and golden stonefly hatches in late June and July.
What do Snake River Cutthroat Trout eat?
Drift feeders by trade, mayflies, caddisflies, stoneflies, and midges make up the bulk of the diet, with terrestrials (hoppers, ants, beetles) becoming critical from June into September.
Where do Snake River Cutthroat Trout live?
Native to the upper Snake River and its tributaries between Jackson Lake and Palisades Reservoir, plus parts of the Wind/Bighorn drainage. Stocked outside that core range as a sport fish, where introduced fish occasionally reach trophy size in productive tailwaters.
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