When is smallmouth bass season in Idaho?

Idaho keeps smallmouth bass 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 smallmouth bass?

The Idaho daily bag limit for smallmouth bass is 6 / day no statewide minimum (IDFG-distinctive aggressive harvest rule — smallmouth managed as invasive non-native species in the Snake River drainage). The possession limit is 12 in possession. Some named waters set a different limit — check the water-body overrides above.

What size smallmouth bass can you keep in Idaho?

The Idaho size rule for smallmouth bass is No statewide minimum (IDFG-distinctive — encourages harvest to reduce predation pressure on native salmon + steelhead + cutthroat). Trophy rule: ID state-record smallmouth 9 lb 11 oz Snake River 2006 Brownlee Reservoir; Brownlee Reservoir + Oxbow + Hells Canyon Reservoirs + Dworshak Reservoir + Lower Granite Dam tailwater + lower Salmon + lower Clearwater Snake River smallmouth ecotype produces 4-6 lb fish routinely on spring pre-spawn pattern; IDFG-distinctive aggressive harvest rule to reduce smallmouth biomass in the Snake drainage.

Do you need a license to fish for smallmouth bass in Idaho?

Yes. Idaho requires a valid fishing license to fish for smallmouth bass, 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 smallmouth bass in Idaho?

Yes. In Idaho, smallmouth bass fishing carries these gear rules: Hook-and-line; trolling permitted; Snagging prohibited for black bass; Two-pole permitted with IDFG Two-Pole Permit ($15.75) on listed waters; IDFG Fishing Licence required ages 14+ ($30.50 res / $108.25 NR annual); Confirm current-year IDFG Fish + Game Rules for reach-specific exceptions.

Do specific Idaho waters have different smallmouth bass rules?

Yes. 5 named Idaho waters carry rules that override the statewide smallmouth bass regulation, including Brownlee Reservoir, Hells Canyon reservoirs, Dworshak Reservoir, and 2 more. See the named water-body overrides above for the exact rule on each.

2026 regulation year

Idaho Smallmouth bass 2026 — Season, Bag Limit, Size Rules

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Last updated May 27, 2026

Idaho smallmouth bass fishery is centered on the Snake River main stem (Brownlee + Oxbow + Hells Canyon Reservoirs + Lower Granite Dam tailwater) + Dworshak Reservoir (North Fork Clearwater River) + Coeur d'Alene Lake + Lower Salmon River. The Snake River smallmouth ecotype (introduced in the early 20th century) has naturally-reproducing populations throughout the 588-mile ID reach + ID/OR boundary reservoirs of the Hells Canyon Dam Complex. Brownlee Reservoir (15,000 acres on the ID/OR boundary — Idaho Power Brownlee Dam built 1958) is one of the country's premier reservoir smallmouth fisheries — spring smallmouth runs in March – June produce 4-6 lb fish routinely. The IDFG management framework is distinctive: smallmouth bass are managed as an invasive non-native species in the Snake River drainage to reduce predation pressure on native salmon + steelhead + cutthroat populations. The IDFG smallmouth rule is one of the most aggressive harvest rules in the country: 6 / day no statewide minimum — there is NO statewide size minimum on smallmouth in Idaho, deliberately structured to encourage harvest and reduce smallmouth biomass in the Snake River drainage. This contrasts sharply with traditional smallmouth-managing states (NY + WI + MN + KY + TN) that ship 14-18 in min trophy-protection rules. Dworshak Reservoir + Coeur d'Alene Lake carry the secondary smallmouth tier alongside the kokanee + chinook + walleye fishery. The lower Salmon River + lower Clearwater + Snake River below Hells Canyon Dam carry mixed smallmouth + steelhead + chinook fishery — anglers may target smallmouth incidentally during the spring + summer chinook + B-run steelhead seasons. ID state-record smallmouth 9 lb 11 oz Snake River 2006 (Brownlee Reservoir). Open year-round statewide.

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Season

Open year-round Open year-round statewide; March – June pre-spawn + spawn densest fishing window on Snake River + Brownlee + Dworshak; June – August post-spawn topwater fishery secondary window.

Bag & possession

Daily bag: 6 / day no statewide minimum (IDFG-distinctive aggressive harvest rule — smallmouth managed as invasive non-native species in the Snake River drainage)
Possession: 12 in possession

Size, slot, trophy rules

Size: No statewide minimum (IDFG-distinctive — encourages harvest to reduce predation pressure on native salmon + steelhead + cutthroat)
Trophy rule: ID state-record smallmouth 9 lb 11 oz Snake River 2006 Brownlee Reservoir; Brownlee Reservoir + Oxbow + Hells Canyon Reservoirs + Dworshak Reservoir + Lower Granite Dam tailwater + lower Salmon + lower Clearwater Snake River smallmouth ecotype produces 4-6 lb fish routinely on spring pre-spawn pattern; IDFG-distinctive aggressive harvest rule to reduce smallmouth biomass in the Snake drainage

Gear restrictions

Hook-and-line; trolling permitted
Snagging prohibited for black bass
Two-pole permitted with IDFG Two-Pole Permit ($15.75) on listed waters
IDFG Fishing Licence required ages 14+ ($30.50 res / $108.25 NR annual)
Confirm current-year IDFG Fish + Game Rules for reach-specific exceptions

Named water-body overrides

Where statewide rules differ on specific Idaho waters:

Brownlee Reservoir
6 / day no minimum; one of country's premier reservoir smallmouth fisheries; ID state-record smallmouth 9 lb 11 oz 2006; ID/OR joint reciprocal compact
Oxbow Reservoir + Hells Canyon Reservoir
6 / day no minimum; ID/OR joint reciprocal compact
Dworshak Reservoir
6 / day no minimum
Snake River main stem
6 / day no minimum; IDFG-distinctive aggressive harvest rule
Coeur d'Alene Lake
6 / day no minimum; mixed cold-water + warm-water fishery

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

Smallmouth bass 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 smallmouth bass season in Idaho?: Idaho keeps smallmouth bass 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 smallmouth bass?: The Idaho daily bag limit for smallmouth bass is 6 / day no statewide minimum (IDFG-distinctive aggressive harvest rule — smallmouth managed as invasive non-native species in the Snake River drainage). The possession limit is 12 in possession. Some named waters set a different limit — check the water-body overrides above.
What size smallmouth bass can you keep in Idaho?: The Idaho size rule for smallmouth bass is No statewide minimum (IDFG-distinctive — encourages harvest to reduce predation pressure on native salmon + steelhead + cutthroat). Trophy rule: ID state-record smallmouth 9 lb 11 oz Snake River 2006 Brownlee Reservoir; Brownlee Reservoir + Oxbow + Hells Canyon Reservoirs + Dworshak Reservoir + Lower Granite Dam tailwater + lower Salmon + lower Clearwater Snake River smallmouth ecotype produces 4-6 lb fish routinely on spring pre-spawn pattern; IDFG-distinctive aggressive harvest rule to reduce smallmouth biomass in the Snake drainage.
Do you need a license to fish for smallmouth bass in Idaho?: Yes. Idaho requires a valid fishing license to fish for smallmouth bass, 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 smallmouth bass in Idaho?: Yes. In Idaho, smallmouth bass fishing carries these gear rules: Hook-and-line; trolling permitted; Snagging prohibited for black bass; Two-pole permitted with IDFG Two-Pole Permit ($15.75) on listed waters; IDFG Fishing Licence required ages 14+ ($30.50 res / $108.25 NR annual); Confirm current-year IDFG Fish + Game Rules for reach-specific exceptions.
Do specific Idaho waters have different smallmouth bass rules?: Yes. 5 named Idaho waters carry rules that override the statewide smallmouth bass regulation, including Brownlee Reservoir, Hells Canyon reservoirs, Dworshak Reservoir, and 2 more. See the named water-body overrides above for the exact rule on each.

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