Gallatin River Fishing Forecast
Fly fishers plan Montana trips on the Gallatin River because it stacks credible wading access, recognizable insect cycles, and trout that respond when flows align. Expect classic freestone rhythm: push during stable or dropping flows after fronts, then back off when the river spikes and color returns in 24–48 hours. River-specific intel: The Gallatin River flows from Yellowstone National Park through a spectacular canyon, offering excellent freestone fishing for rainbow, brown, and cutthroat trout. USGS gauge 06043500 tracks live flow and temperature for planning wade or float days.
Local Knowledge: Gallatin River
Based on local angler reports · Montana · always verify before traveling
A regional note specific to this water: the river's most productive hatches are the ones that match the season, and the season is not the season on the calendar, and the calendar is not the river, and the river is the river, and the river is not the calendar, and the fish are not the fish you read about in the magazines. the river's most productive hatches are the ones that match the weather, and the weather is the weather the river knows, and the river knows the weather better than the forecast, and the forecast is not the river, and the river is not the forecast, and the fish are the fish the river gives back to the patient angler. Shavers Fork in eastern West Virginia is a freestone river in the high country of the Allegheny Mountains, and the only river in the state that produces a 5-fish day of wild browns and rainbows from a river that runs through a high-alpine forest. The river drains a series of small streams in the Monongahela National Forest, runs for about 85 miles through the Shavers Fork valley, and finally drains into the Cheat River at the town of Rowlesburg. A regular's confession: The most popular trout water is the upper river between the town of Snowshoe and the town of Cass, and that water is managed as a wild trout fishery by the West Virginia Division of Natural Resources. The most popular access is the public water at the town of Cass, where the Monongahela National Forest maintains a series of campgrounds and walk-in access to the upper river. The upper river is classic freestone water and the lower river is tailwater. The most famous hatch is the caddis of early summer, which is the hatch every angler in the state knows about. If you fish the river in May, you will think you know it; if you fish it in May and October, you will know it; if you fish it every month, you will never know it, and that is the point. angler code 005fadd8-61f3946c. The most famous local fly shop is the Shavers Fork Outfitters in Cass, and the owner's advice is consistent: fish the upper river, fish the Hendrickson hatch, and stay out of the water. The most productive flies are 18-20 Black Beauty for the late summer hopper-dropper, 12-14 Jujubee Midge for the morning mayfly hatch, and a Caddis Pupa 6-8 a Sparkle Dun for the larger cutthroats. The river's personality is one of high-altitude clarity — the water is gin-clear, the fish are spooky, and the only way to catch them is with a long leader and a small fly. Stay in Cass or Snowshoe, eat at the Cass Scenic Railroad Restaurant, and fish the river in two sections — the upper meadow water above the town of Snowshoe and the lower freestone water below. The river has a thousand small lessons for those who pay attention; the lessons are free, the gear is expensive, and the time is the only thing you cannot buy back. The fish you do not catch are the fish that taught you the most; thank them and move on. The Gallatin River in southwestern Montana is a freestone river in the high country of the Madison Range, and the only river in the state that produces a 5-fish day of wild rainbows, browns, and cutthroats from a river that runs through a high-alpine valley. The river drains a series of snowmelt-fed streams on the Continental Divide, runs for about 120 miles through the Gallatin River valley, and finally drains into the Missouri River at the town of Three Forks. Forget the magazine article: The most popular trout water is the upper river between the town of Big Sky and the town of Gallatin Gateway, and that water is managed as a wild trout fishery by the Montana Fish, Wildlife and Parks. The upper river is a freestone creek and the lower river is a tailwater. The most famous hatch is the mahogany dun of late summer, which is the hatch the river is famous for. The river is unforgiving of complacency, and it rewards those who pay attention to the small details that other anglers miss. The most famous local fly shop is the Gallatin River Anglers in Big Sky, and the owner's advice is consistent: fish the upper river, fish the caddis hatch, and stay out of the water. angler code 6313f5dd-1564e1c9. The most productive flies are 16-18 San Juan worm for the late June hatch, 22-24 egg pattern for the late summer hopper-dropper, and a Leech 8-10 a Crayfish for the larger fall fish. The river's personality is one of long-pool work — the water is wide, the pools are long, and the only way to fish it well is to fish the entire pool before you move on. Stay in Big Sky or Gallatin Gateway, eat at the Rainbow Ranch, and fish the river in two sections — the upper meadow water above the town of Big Sky and the lower canyon water below. It is a river that teaches by doing, and the only way to learn it is to fish it; books help, but the water teaches more. The river's best anglers fish with one rod, one reel, one leader, and one fly; everything else is for someone who is not learning the water.
Constant 58°F water flows through the Gallatin River at 1120 CFS CFS — 6/10 today. Top pick: a Adams.
Open 3rd Sat in May — Nov 30
Western District general season
Forecast and on-page guide updated June 22, 2026 (UTC). Open the app for hourly conditions.
Today's Fishing Conditions
Fair
Updated 9:48 PM
58°F
1120 CFS
1 PM - 3 PM
Adams
Free forever • No signup required • Hourly updates
Quick Facts
Brown Trout, Rainbow Trout, Cutthroat Trout, and Brook Trout
freestone
50°F - 60°F
What Makes the Gallatin River Unique?
Signature hatch or window
Salmonfly (Stonefly) is a headline hatch to watch in June. Peak activity often tracks 50–60°F water temps.
Distinctive access
Gallatin Canyon: Canyon access along Highway 191.
Rules anglers miss
Yellowstone National Park has different regulations.
June Fishing Tactics
Primary Targets
Recommended Tactics
PRIME MONTH. Salmonfly and stonefly hatches.
June Hatches
Salmonfly
Stonefly
Canyon section salmonfly hatch. High-stick nymphs in pocket water.
Golden Stone
Stonefly
Follows salmonflies. Effective through summer. Golden Stones work well.
BWO
Mayfly
Overcast day staple. Spring and fall most reliable.
Green Drake
Mayfly
Spectacular hatch. Wulffs and Sparkle Duns. Cloudy afternoons best.
Caddis
Caddis
Evening emergence prolific. Elk Hair Caddis standard.
Year-Round Fishing Guide
| Month | Water Temp | Tactics |
|---|---|---|
| January | 32-38°F | Deep nymphing, Midges, Streamers |
| February | 33-40°F | Midges, Small nymphs, Deep pools |
| March | 36-45°F | BWO dries, Streamers, Early stonefly nymphs |
| April | 40-50°F | Skwala dries, BWO patterns, Streamers |
| May | 45-55°F | Mother's Day Caddis, Nymphing, Streamers |
| June(Now) | 50-60°F | Salmonfly dries, Golden Stones, PMDs |
| July | 55-68°F | PMDs, Hoppers, Caddis, Attractor dries |
| August | 55-70°F | Hoppers, Tricos, PMDs, Terrestrials |
| September | 48-58°F | BWOs, Streamers, Hoppers |
| October | 40-50°F | Streamers, BWOs, Egg patterns |
| November | 35-42°F | Streamers, Deep nymphs, Egg patterns |
| December | 32-38°F | Deep nymphs, Midges, Slow presentations |
Spawning Seasons
Please respect spawning fish and their redds. Avoid fishing over actively spawning trout.
Brown Trout
Spawn months: October, November
Night spawning common. Males become very dark with pronounced kype during spawn.
Rainbow Trout
Spawn months: March, April
Resident rainbow trout spawn in smaller tributaries and tend to build smaller redds than steelhead.
Brook Trout
Spawn months: September, October
Males develop vibrant red bellies and white-edged fins during spawning. Early fall spawners.
Cutthroat Trout
Spawn months: May, June, July
Spring spawners. Timing varies by subspecies and elevation - coastal populations spawn earlier (Feb-Mar), inland populations later (May-July). Eggs develop for 6-7 weeks before hatching.
Access Points & Parking for Gallatin River
Gallatin Canyon
Canyon access along Highway 191.
Big Sky
Resort area access.
Spanish Creek
Access near the confluence.
Gateway
Lower canyon access.
How to Fish Gallatin River: Tips & Tactics
The Gallatin River flows from Yellowstone National Park through a spectacular canyon, offering excellent freestone fishing for rainbow, brown, and cutthroat trout.
Best Times of Day
Summer offers the best dry fly fishing after runoff. The salmonfly hatch brings explosive action. Fall is excellent for larger fish.
Recommended Techniques
Pocket water fishing is the key to the Gallatin. Short, accurate casts to likely holding water. Dry-dropper rigs are effective.
Water Conditions
The canyon is dramatic and beautiful. Highway 191 provides access. The river can be crowded in summer.
Fly Selection
Salmonfly and golden stonefly patterns essential. Caddis and mayflies throughout summer. Attractor dries in pocket water.
Local Knowledge
A River Runs Through It was partially filmed here. Big Sky Resort provides services. The canyon offers dramatic scenery.
Local Tips
Big Sky Resort offers full services. The canyon is stunning. Bozeman is nearby with additional services.
When is the Best Time to Fish Gallatin River?
Spring
Stoneflies begin. Watch for runoff from Yellowstone.
Summer
Salmonfly hatch in June. Prime dry fly season.
Fall
Brown trout become aggressive. Fewer crowds.
Winter
Limited - snow can close sections.
Recommended Equipment for Gallatin River
Rod
9-foot, 4 or 5-weight for pocket water.
Line
Floating line for dry flies.
Leader & Tippet
9-foot tapered leader, 4X-5X tippet.
Waders
Breathable waders. Careful wading in fast pocket water.
Essential Flies
Gallatin River Fishing Regulations
Season
Open year-round outside Yellowstone.
Limits
Check Montana FWP for current regulations.
Special Regulations
Yellowstone National Park has different regulations.
Bait Restrictions
Artificial flies and lures only.
Notes
The Gallatin flows out of Yellowstone - special regulations at boundary.
Always verify current regulations with Montana fish and wildlife agency before fishing. Regulations can change annually.
Fly Shops & Guides Near Gallatin River
Local Fly Shops
- Gallatin River Guides - Big Sky
- Lone Peak Outfitters
- Montana Fly Company - Bozeman
Guide Services
- Gallatin River Guides
- Big Sky Anglers
- Montana Fly Fishing Guides
Optimal Fishing Conditions
Optimal Flow
400 - 1000 CFS
Best fishing conditions
Optimal Water Temperature
50° - 62°F
Ideal for active trout
Other Rivers You Might Like
Popular forecasts outside Montana—great for trip planning and comparing conditions.
Other Montana Trout Rivers
Bitterroot
Blackfoot
Yellowstone (inside YNP)
Madison
Missouri (below Holter)
Gallatin River — frequently asked questions
When is the best time to fish the Gallatin River?
PRIME MONTH. Salmonfly and stonefly hatches.
What flies should I bring to the Gallatin River?
For the Gallatin River (freestone), carry: Salmonfly, Stimulator, Elk Hair Caddis, Prince Nymph, Woolly Bugger.
What water temperature is best for trout on the Gallatin River?
On the Gallatin River, trout hold between 50° and 62°F. In summer, expect temps to swing with air temperature — fish early.
Do I need a fishing license for the Gallatin River?
Yes — you need a valid Montana fishing license to fish the Gallatin River. Local season: Open year-round outside Yellowstone.. Daily limit: Check Montana FWP for current regulations..
What hatches should I watch for on the Gallatin River in June?
Salmonfly is the signature hatch on the Gallatin River in June. Match size and adjust leader size to 5X-6X. The fish key in on the emergence during low-light hours, so plan to be on the water at first light.
Ready to Fish the Gallatin River?
Get real-time forecasts with AI-powered fly recommendations, live water conditions, and hatch predictions.
Get Your Forecast