Gallatin River Fishing Forecast
Blue-ribbon freestone through Gallatin Canyon with excellent pocket water fishing
Opens 3rd Sat in May
Western District general season
Today's Fishing Conditions
Fair
Updated 5:51 PM
50°F
320 CFS
2 AM - 4 AM
Scud
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Quick Facts
Brown Trout, Rainbow Trout, Cutthroat Trout, and Brook Trout
freestone
36°F - 45°F
March Fishing Tactics
Primary Targets
Recommended Tactics
Early hatches begin. Look for BWOs.
March Hatches
Skwala
Stonefly
Early season excitement. Pre-runoff dry fly opportunity.
Midge
Midge
Winter lower river fishing. Zebra Midges, Griffith's Gnats.
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(Now) | 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 | 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 Montana Trout Rivers
Bitterroot
Blackfoot
Yellowstone (inside YNP)
Madison
Missouri (below Holter)
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