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Legendary Species · Idaho

Bull trout in Idaho

Salvelinus confluentus[1]

41 Idaho waters whose agency species list names bull trout. Each links to its water page (gauge, regulations, access map, guides and shops) and to the agency list it comes from.

  • 41waters list it
  • 0destination hubs
A bull trout resting over cobbles in clear shallow water, its olive body dotted with pale spots
Bull trout (Salvelinus confluentus), photographed by Bart Gammet for the U.S. Fish and Wildlife Service. Photo: Bart Gammet, U.S. Fish and Wildlife Service, public domain, via Wikimedia Commons

Idaho waters

Most fished first. A species missing from an agency list does not mean it is absent; this page lists only waters whose list names it (at least 5 are needed for a page).

All Idaho watersBull trout: every state

Identification

  • Like lake trout and brook trout, bull trout have light spots on a dark background, the reverse of rainbow and cutthroat trout, which have dark spots on a lighter background.[2]
    What the source says
    “Also, like lake trout and brook trout their most obvious distinctive feature is light spots on a dark background, unlike rainbow and cutthroat that have dark spots on a lighter background.”
  • Bull trout are often mistaken for brook trout. Key differences: bull trout have no black spots on the dorsal fin and no worm-like vermiculations.[3]
    What the source says
    “Closely related to and commonly misidentified as brook trout (both are members of the char family). A distinguishing characteristic is the lack of black spots on the dorsal fin. Do not have vermiculations that occur on brook trout.”
  • Glacier National Park says bull trout have pink or orange spots on their sides and pale yellow spots on their backs.[4]
    What the source says
    “Bull trout have pink or orange spots on their sides with pale yellow spots on their backs.”

More on identifying bull trout

Status, protections and rules

As each agency stated them on the date read; a rule applies only where its agency says so. Check the current regulations for the water before you fish.

  • Under a USFWS final rule, bull trout are listed as threatened under the Endangered Species Act throughout their range in the coterminous (lower 48) United States.[5]
    What the source says
    “With this final rule, the bull trout will now be listed as threatened throughout its entire range in the coterminous United States.”
  • Montana FWP 2026 rule: possessing a live bull trout is unlawful for any reason. A bull trout being harvested must be killed immediately, and every other bull trout must be released unharmed with no delay.[6]
    What the source says
    “NOTE: It is unlawful to possess a live Bull Trout for any reason. Any Bull Trout being harvested must be killed immediately; all other Bull Trout must be released unharmed with no delay.”
  • WDFW rule: a bull trout caught in water closed to bull trout fishing must not be taken out of the water. It must be unhooked and released immediately.[2]
    What the source says
    “If an angler catches a bull trout in a water closed for bull trout fishing, they must not be taken out of the water. They must be de-hooked and immediately released.”
  • Glacier National Park rule: no bull trout may be kept. Any caught by accident must be handled carefully and released immediately.[4]
    What the source says
    “No bull trout may be retained. Any caught incidentally must be handled carefully and immediately released.”

Water temperature in Idaho

  • Under 66°FIn the study Idaho Fish and Game cites, trout landed in water under 66°F survived best: mortality “was 69% higher for trout landed at 73°F water temperatures than for those landed when waters were less than 66°F.” In summer, “early-mornings are typically best while the water is still cool.”
  • WarmingIdaho Fish and Game cites a study in which mortality “was 69% higher for trout landed at 73°F water temperatures than for those landed when waters were less than 66°F.” Fish early: “early-mornings are typically best while the water is still cool.”
  • 73°FIdaho Fish and Game: “On those occasions where trout streams do get above 73°F, anglers may want to pause fishing because catch rates are noticeably lower.” Idaho sets no temperature closure: “Idaho Fish and Game is hesitant to close fishing in wild trout waters based on warm water temperatures.”

Sources: Perspective: Trout fishing during low water and high temperatures (25 July 2024; archived copy) (Idaho Department of Fish and Game); The heat is on, but trout and other coldwater fish have been around the block a time or two (9 Aug 2022; archived copy) (Idaho Department of Fish and Game).

Hatch & season charts

Sources

Every fact on this page is our paraphrase of the page cited beside it, read on the date shown. Rules and seasons change: check the agency's current regulations before you fish.

  1. Bull Trout (Salvelinus confluentus) | U.S. Fish & Wildlife Service U.S. Fish and Wildlife Service, read Oct 24, 2026.
  2. Bull trout | Washington Department of Fish & Wildlife Washington Department of Fish and Wildlife, read Oct 24, 2026.
  3. Fishing for Bull Trout (native) California Department of Fish and Wildlife, read Oct 24, 2026.
  4. Fishing - Glacier National Park (U.S. National Park Service) National Park Service, read Oct 24, 2026.
  5. ETWP; Determination of Threatened Status for Bull Trout in the Coterminous United States U.S. Fish and Wildlife Service, read Oct 24, 2026.
  6. 2026 Bull Trout Regulations (PDF) Montana Fish, Wildlife & Parks, read Oct 24, 2026.