Brown trout
Big Lost River
Updated
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Fish › Trout
Salmo trutta
Wary, hard-fighting trout that reward careful presentations and can grow into true fish-eaters.
Size range
28–55 in
Size range
Typical adult length in the waters we cover.
Water temperature
Coldwater
Water temperature
Preferred thermal regime for this species.
Active season
Year round
Active season
When anglers most often encounter this species.
Origin
Introduced
Origin
Stocking and native history where this species is found.
Habitat
Rivers & Large Rivers, Lakes & Reservoirs
Habitat
Primary water types where this species is found.
Brown trout are an introduced coldwater trout in Idaho, now established in rivers, tailwaters, and some reservoirs. Juveniles feed mostly on aquatic insects, while larger fish become more territorial and shift heavily toward crustaceans and baitfish.
Also known as: browns
Brown trout
Big Lost River
Brown trout
Big Wood River
Brown trout
Henrys Fork of the Snake River
Brown trout
Henrys Fork of the Snake River, Box Canyon to Riverside
Brown trout
Henrys Fork of the Snake River, Headwaters to Box Canyon
Brown trout
Henrys Fork of the Snake River, Riverside to Mouth / terminus
Brown trout
Silver Creek
Brown trout
South Fork Boise River
Brown trout
South Fork Snake River
Brown trout
Teton River
Episode 160 · Jul 1, 2020
Young browns feed mainly on insect larvae; larger fish add crustaceans and baitfish and often turn into ambush predators.
Brown trout are not a protected species statewide, but seasons, tackle restrictions, and harvest limits vary by water on Idaho Fish and Game rules and planner pages. Check the specific Bear River, Big Lost River, or Big Wood River section before fishing.
Regulations vary by water. Check current Idaho Fish and Game rules before fishing.
Status: Introduced to Idaho
G5 (Secure) · ESA: Not listed · Idaho: SNABrowse species profiles with habitat, diet, tactics, and linked waters across the state.
Brown trout
Bear River, Cove Plant to Grace Dam
