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Montana

Gallatin River

Montana·Southwest Montana·45.40° N, 111.20° W
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Solunar · next 7 days

About Gallatin River

The Gallatin is the wade-fishing river of Southwest Montana — 115 miles from its headwaters inside Yellowstone NP, down through the Gallatin Canyon along Highway 191, into the Gallatin Valley near Bozeman, and to its confluence with the Madison and Jefferson at Three Forks to form the Missouri. The famous water is the canyon stretch — about 35 miles between the Park boundary at Buffalo Horn Creek and Gallatin Gateway, where the river runs along the highway with pull-outs every few hundred yards. Wild rainbows, browns, and native Yellowstone cutthroat make up the trout fishery, plus mountain whitefish in the deeper runs. Fish average smaller than the Madison or Yellowstone (10-14 inches with regulars to 18) but the access and the variety of water make it a perfect wade fishery for anglers without a drift boat. Below Gallatin Gateway the river runs through agricultural valley with reduced flows from irrigation diversions; the fishery thins from there to the confluence.

The Gallatin's hatch calendar mirrors the Madison's but on a smaller scale. Salmon flies (Pteronarcys californica) hatch in the canyon late June into early July, working upstream day by day from Gallatin Gateway to the Park boundary. Golden stoneflies overlap and run through July. Caddis throughout summer, PMDs in July, BWOs in spring and fall. Tricos in August in the slower water below Gallatin Gateway. October brings a strong BWO hatch on overcast afternoons. The river is too small for serious streamer fishing in the upper reaches — short twitch retrieves with smaller patterns work better than the big-water articulated streamer game. Run-off typically peaks late May through June and clears by mid-July.

Big Sky is the upper-river town with several fly shops including the Gallatin River Guides and East Slope Outdoors. Bozeman is 30 minutes northeast and is fly fishing infrastructure central — Fins & Feathers, the Bozeman Angler, and others. Highway 191 parallels the entire canyon, so access is constant — every pull-out within the canyon is a potential fishing spot. Drive times: 1 hour from Bozeman to Big Sky, 4 hours from Salt Lake City. The river runs through Yellowstone NP for its first 20 miles, requiring a separate Park fishing permit. The Park section closes May 15-July 15 to protect spawning trout. The canyon section through MT has hoot-owl risk in low/hot summers — check FWP. Wading in the canyon is challenging at higher flows — fast pocket water, slick bedrock, and round cobble. Felt or studded rubber soles and a wading staff are not optional.

Species

  • Rainbow Trout
    Abundant · Jul-Oct · 10-18"

    Wild population through the canyon and middle river. Smaller average size than the Madison or Yellowstone.

  • Brown Trout
    Common · Sep-Nov · 12-22"

    Strongest concentrations from Gallatin Gateway downstream. Some larger browns hold in the deeper canyon pools.

  • Cutthroat Trout
    Uncommon · Jul-Sep · 10-16"

    Native Yellowstone cutthroat in the upper canyon and Park section. Release immediately.

  • Mountain Whitefish
    Abundant · Year-round · 10-16"

    Native and prolific. Often hammer small nymphs in the deeper runs.

SpeciesAbundanceBest SeasonSize
Rainbow TroutAbundantJul-Oct10-18"
Brown TroutCommonSep-Nov12-22"
Cutthroat TroutUncommonJul-Sep10-16"
Mountain WhitefishAbundantYear-round10-16"

Sections

6 reaches

Gallatin Gateway to Logan (valley section)

Wade & FloatBrown Trout · Rainbow Trout · Whitefish

Below Gallatin Gateway the river widens through agricultural valley with reduced flows from irrigation diversions. Trout fishery thins; mountain whitefish remain abundant. Best fall and spring; suffers in summer.

Best for: Brown trout and mountain whitefish. Best Sep-Apr. Hoot-owl risk in summer.

Squaw Creek to Gallatin Gateway

WadeSalmon · Brown Trout · Whitefish

Lower canyon stretches with the river slowing slightly as it approaches the valley. Highway 191 access throughout. Salmon fly hatch starts here in late June and works upstream over ~2 weeks.

Best for: Wild rainbow, brown, and whitefish. Salmon flies late June; mayfly and caddis fishing through summer.

Big Sky to Squaw Creek

WadeBrown Trout · Rainbow Trout

Heart of the Gallatin Canyon — steep gradient through the gorge with continuous riffle and pocket water. Pull-outs at Storm Castle, Greek Creek, Swan Creek, Squaw Creek. Wading the canyon is challenging — slick bedrock and fast current.

Best for: Wild rainbow and brown trout on stoneflies, caddis, and hopper-dropper rigs. Best for confident wade anglers.

Taylor's Fork to Big Sky

WadeSalmon · Brown Trout · Rainbow Trout

Canyon water from Taylor's Fork through the Big Sky basin. River picks up flow from the West Fork (Big Sky) and gathers character. Pull-outs every few hundred yards along Highway 191. Heaviest fishing pressure of the canyon section in summer.

Best for: Wild rainbow trout and brown trout. Salmon flies in late June; PMDs and caddis through summer.

Park boundary to Taylor's Fork

WadeCutthroat · Brown Trout · Rainbow Trout

Upper canyon stretch from the YNP boundary at Buffalo Horn Creek downstream to Taylor's Fork. Smaller water through meadow and timber, picking up volume from each tributary. Highway 191 access at multiple pull-outs.

Best for: Wild rainbow trout, brown trout, and cutthroat. Best Jul-Oct post-runoff. Hopper-dropper rigs through summer.

Yellowstone NP section (Park boundary to Gardiner Lake Junction)

WadeCutthroat · Rainbow Trout

Headwaters of the Gallatin inside Yellowstone NP between Gallatin Lake and the Park boundary at Buffalo Horn Creek. Small meadow water with wild cutthroat and rainbows. Park permit required, flies/lures only. Closed May 15-July 15 for spawning.

Best for: Yellowstone cutthroat trout and small rainbows. Park permit required. Best Jul-Sep when YNP water opens.

At a glance

Ideal wading flow
400–1,200 cfs
Blow-out
>2,500 cfs
Ideal water temp
48–62°F
Best seasons

Late June into early July for salmon flies (timed to runoff drop). July-August for caddis, PMDs, and hopper fishing. September-October for fall BWO and aggressive browns. Avoid mid-May through late June (runoff).

Regulations

Open year-round in most of the canyon. Spawning closure on the upper river through Yellowstone NP from May 15 to July 15. Standard MT regulations apply outside the Park.

  • Yellowstone NP boundary at Buffalo Horn Creek to Gallatin Gateway: open year-round; standard MT trout limits
  • Gallatin Gateway to confluence: open year-round; standard MT trout limits; warmwater section
  • Yellowstone NP section: Park permit required; flies/lures only; closed May 15-July 15 for spawning
  • Mountain whitefish counted as part of trout daily bag limit

Hoot-owl restrictions can apply on the lower river in hot/low summers — check the FWP Hoot Owl page during July-August. Yellowstone NP requires separate Park permit (not the MT state license).

Source: Montana Fish, Wildlife & Parks — Fishing Regulations. Regulations change annually. Verify before fishing.

Getting there

Big Sky, MT

1 hr from Bozeman, 4 hrs from Salt Lake City, 5 hrs from Billings

Fly shops

  • Gallatin River GuidesBig Sky
  • East Slope OutdoorsBig Sky
  • Fins & Feathers of BozemanBozeman
  • The Bozeman AnglerBozeman

Camping: Several USFS campgrounds along Highway 191 (Greek Creek, Swan Creek, Spire Rock). Big Sky has lodging from full resort to streamside cabins. Gallatin Gateway has a few cabins; full services in Bozeman 30 minutes northeast.

Highway 191 parallels the canyon for the entire 35-mile stretch — access at every pull-out. FWP fishing access sites at Squaw Creek, Greek Creek, Swan Creek, and below. No floating allowed on the canyon section (regulation) — wade only above the Highway 84 bridge.

No recent fishing reports for Gallatin River

We aggregate reports from local fly shops, guides, and lodges as they publish. Check back, or browse the shops on the Guide tab.

More in Montana

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98.6 cfs48°F water

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Jefferson River

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Madison River

303 cfs52°F water

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Ruby River

106 cfs48°F water

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Yellowstone River

1,260 cfs50°F water

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Other regions

Bighorn River

1,600 cfs53°F water

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Bitterroot River

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Blackfoot River

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Clark Fork River

193 cfs48°F water

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Flathead River

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Kootenai River

4,240 cfs55°F water

Good
Fishing
Fair
Flow
246cfs
steady · Gallatin R above Deer Creek, near Big Sky
Water temp
47°F
Gallatin R above Deer Creek, near Big Sky
Flow vs normal
Below Normal
20th percentile for mid-October
Flow
246cfs
Gallatin R above Deer Creek, near Big Sky · stable
Water temp
47°F
Gallatin R above Deer Creek, near Big Sky
Flow vs normal
Below Normal
20th percentile for mid-October
Median 279 cfs
Weather
30°F
Mostly Clear · near Big Sky

Fishing conditions

Fair
PoorSlowFairGoodPrime
How we rate this
Fri
10/16
—
MDE
Sat
10/17
—
MDE
Sun
10/18
—
MDE
Mon
10/19
—
MDE
Tue
10/20
—
MDE

MmorningDmiddayEevening

poorprime

Today
morning6:42a – 11:42aFairCalm wind
midday11:42a – 2:41pFairLight wind, 2 mphRising pressureBright sun
evening2:41p – 7:41pGoodFalling pressureLight wind, 2 mph
Measured
246 cfs, a little low49°F, idealAQI 51

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