When is brook trout season in Idaho?

Idaho keeps brook trout open to fishing year-round for the 2026 regulation year — there is no closed season, though the daily bag and size limits below still apply every day.

What is the Idaho bag limit for brook trout?

The Idaho daily bag limit for brook trout is Within the statewide 6 / day combined trout limit (rainbow + brown + brook + cutthroat); many high-mountain lakes + streams carry liberalized or bonus brook-trout limits (confirm the reach rule). The possession limit is 12 in possession combined trout (more on waters with a bonus brook allowance). Some named waters set a different limit — check the water-body overrides above.

What size brook trout can you keep in Idaho?

The Idaho size rule for brook trout is No statewide minimum. Trophy rule: Henrys Lake is a renowned trophy brook trout + Yellowstone cutthroat fishery; the Sawtooth + White Cloud + Pioneer + Lost River + Selkirk ranges hold hundreds of alpine brook-trout lakes; IDFG liberalizes limits on overpopulated high-mountain waters to improve size structure.

Do you need a license to fish for brook trout in Idaho?

Yes. Idaho requires a valid fishing license to fish for brook trout, with the usual exemptions for young children, state free-fishing days, and some senior or disabled-veteran categories. A license is valid only in the state that issued it, so non-residents need a Idaho license — compare resident and non-resident Idaho fees on the state regulations page below.

Are there gear restrictions for brook trout in Idaho?

Yes. In Idaho, brook trout fishing carries these gear rules: Hook-and-line; live bait permitted on most waters; Artificial-lures-only + barbless single hook on listed quality-management + catch-and-release reaches; Electric-motor-only special-regulation on Henrys Lake; IDFG Fishing Licence required ages 14+ ($30.50 res / $108.25 NR annual); Confirm current-year IDFG Fish + Game Rules for the per-water brook-trout limit.

Do specific Idaho waters have different brook trout rules?

Yes. 3 named Idaho waters carry rules that override the statewide brook trout regulation, including Henrys Lake, High-mountain alpine lakes, Native cutthroat + bull trout headwaters. See the named water-body overrides above for the exact rule on each.

2026 regulation year

Idaho Brook trout 2026 — Season, Bag Limit, Size Rules

Salvelinus fontinalis

Last updated May 30, 2026

Brook trout (Salvelinus fontinalis) are a non-native char — introduced from the eastern US — that have naturalized throughout Idaho's high-mountain lakes + headwater streams, where the cold, infertile water suits them better than any other salmonid. The Sawtooth, White Cloud, Pioneer, Lost River + Selkirk ranges hold hundreds of brook-trout alpine lakes, and Henrys Lake (6,500 acres at the Continental Divide near Yellowstone) is a renowned trophy brook + cutthroat fishery. Brook trout count within the statewide 6 / day combined trout limit (with rainbow, brown + cutthroat), but because high-density brook populations tend to overpopulate + stunt, IDFG liberalizes the limit on many high-mountain lakes + streams to encourage harvest — some waters carry a bonus brook-trout allowance on top of the general trout limit. The flip side of the management story is conservation conflict: in a handful of drainages brook trout compete with + hybridize against native cutthroat + federally Threatened bull trout, so some headwater reaches are managed for brook-trout removal. Brook trout are open year-round on most waters, but the alpine-lake fishery is effectively July – September after high-country ice-out, when backpacking anglers reach the basins. Always confirm the per-water rule — the brook-trout limit is one of the most water-specific numbers in the Idaho rule book.

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Season

Open year-round Open year-round on most waters; the high-mountain alpine-lake fishery runs July – September after ice-out; Henrys Lake managed under IDFG special-regulation.

Bag & possession

Daily bag: Within the statewide 6 / day combined trout limit (rainbow + brown + brook + cutthroat); many high-mountain lakes + streams carry liberalized or bonus brook-trout limits (confirm the reach rule)
Possession: 12 in possession combined trout (more on waters with a bonus brook allowance)

Size, slot, trophy rules

Size: No statewide minimum
Trophy rule: Henrys Lake is a renowned trophy brook trout + Yellowstone cutthroat fishery; the Sawtooth + White Cloud + Pioneer + Lost River + Selkirk ranges hold hundreds of alpine brook-trout lakes; IDFG liberalizes limits on overpopulated high-mountain waters to improve size structure

Gear restrictions

Hook-and-line; live bait permitted on most waters
Artificial-lures-only + barbless single hook on listed quality-management + catch-and-release reaches
Electric-motor-only special-regulation on Henrys Lake
IDFG Fishing Licence required ages 14+ ($30.50 res / $108.25 NR annual)
Confirm current-year IDFG Fish + Game Rules for the per-water brook-trout limit

Named water-body overrides

Where statewide rules differ on specific Idaho waters:

Henrys Lake
Trophy brook trout + Yellowstone cutthroat fishery; electric-motor-only special-regulation; confirm current-year brook limit
High-mountain alpine lakes
Liberalized / bonus brook-trout limits on many overpopulated waters (Sawtooth + White Cloud + Pioneer + Lost River + Selkirk ranges)
Native cutthroat + bull trout headwaters
Some reaches managed for brook-trout removal to protect native cutthroat + federally Threatened bull trout

Official source

Idaho Department of Fish and Game (IDFG) publishes the authoritative 2026 Idahofishing regulations. Always verify the current rule before fishing — emergency closures and in-season changes can override what's published here.

Visit official Idaho fishing regulations →

Emergency-order channel

Brook trout closures, slot-limit changes, and harvest pauses are posted to Idaho Department of Fish and Game's emergency-order feed — check it before any Idaho trip during the active season.

Frequently asked questions

When is brook trout season in Idaho?: Idaho keeps brook trout open to fishing year-round for the 2026 regulation year — there is no closed season, though the daily bag and size limits below still apply every day.
What is the Idaho bag limit for brook trout?: The Idaho daily bag limit for brook trout is Within the statewide 6 / day combined trout limit (rainbow + brown + brook + cutthroat); many high-mountain lakes + streams carry liberalized or bonus brook-trout limits (confirm the reach rule). The possession limit is 12 in possession combined trout (more on waters with a bonus brook allowance). Some named waters set a different limit — check the water-body overrides above.
What size brook trout can you keep in Idaho?: The Idaho size rule for brook trout is No statewide minimum. Trophy rule: Henrys Lake is a renowned trophy brook trout + Yellowstone cutthroat fishery; the Sawtooth + White Cloud + Pioneer + Lost River + Selkirk ranges hold hundreds of alpine brook-trout lakes; IDFG liberalizes limits on overpopulated high-mountain waters to improve size structure.
Do you need a license to fish for brook trout in Idaho?: Yes. Idaho requires a valid fishing license to fish for brook trout, with the usual exemptions for young children, state free-fishing days, and some senior or disabled-veteran categories. A license is valid only in the state that issued it, so non-residents need a Idaho license — compare resident and non-resident Idaho fees on the state regulations page below.
Are there gear restrictions for brook trout in Idaho?: Yes. In Idaho, brook trout fishing carries these gear rules: Hook-and-line; live bait permitted on most waters; Artificial-lures-only + barbless single hook on listed quality-management + catch-and-release reaches; Electric-motor-only special-regulation on Henrys Lake; IDFG Fishing Licence required ages 14+ ($30.50 res / $108.25 NR annual); Confirm current-year IDFG Fish + Game Rules for the per-water brook-trout limit.
Do specific Idaho waters have different brook trout rules?: Yes. 3 named Idaho waters carry rules that override the statewide brook trout regulation, including Henrys Lake, High-mountain alpine lakes, Native cutthroat + bull trout headwaters. See the named water-body overrides above for the exact rule on each.

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