Jefferson River Fishing Forecast
Brown trout dominated river with excellent pre-runoff and fall streamer fishing
Opens 3rd Sat in May
Western District general season
Today's Fishing Conditions
Challenging
Updated 11:36 PM
39°F
1130 CFS
11 PM - 1 AM
WD-40
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Quick Facts
Brown Trout and Rainbow Trout
freestone
36°F - 45°F
March Fishing Tactics
Primary Targets
Recommended Tactics
Early hatches begin. Look for BWOs.
March Hatches
Skwala
Stonefly
Pre-runoff window of opportunity. Fish warm afternoons.
BWO
Mayfly
Extended season. Fall fishing can be outstanding.
Midge
Midge
Winter fishing option. Deep slow pools.
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.
Access Points & Parking for Jefferson River
Twin Bridges
Where the Big Hole and Beaverhead meet.
Waterloo
Mid-river access.
Cardwell
Lower river access.
Three Forks
Where Jefferson becomes the Missouri.
How to Fish Jefferson River: Tips & Tactics
The Jefferson River forms at Twin Bridges where the Big Hole and Beaverhead join. It flows to Three Forks where it becomes part of the Missouri River headwaters.
Best Times of Day
Summer offers good fishing with diverse hatches. The river can run warm in late summer - fish early. Fall brings brown trout into spawning condition.
Recommended Techniques
Float fishing is the most effective method. Match the hatches when active. Streamers produce larger fish. Target structure and deeper water.
Water Conditions
The Jefferson can run warm and low in late summer. Hoot-owl restrictions may apply. Float fishing covers the most water.
Fly Selection
Caddis and stonefly patterns are essential. Hopper patterns in late summer. Streamers for brown trout. BWOs in fall.
Local Knowledge
Twin Bridges is where two famous rivers merge. Watch for hoot-owl restrictions in summer. Three Forks is where Lewis and Clark named the rivers.
Local Tips
Twin Bridges is the confluence of famous rivers. Lewis and Clark passed through here. Three Forks offers historic significance.
When is the Best Time to Fish Jefferson River?
Spring
Stoneflies and caddis emerge. Good early season fishing.
Summer
Can run warm - fish early. Watch for hoot-owl closures.
Fall
Browns become aggressive. Excellent conditions.
Winter
Limited but fishable on mild days.
Recommended Equipment for Jefferson River
Rod
9-foot, 5 or 6-weight for most fishing.
Line
Floating line for dries. Sink-tip for streamers.
Leader & Tippet
9-foot tapered leader, 4X-5X tippet.
Waders
Breathable waders. Wade carefully.
Essential Flies
Jefferson River Fishing Regulations
Season
Open year-round.
Limits
Check Montana FWP for current regulations.
Special Regulations
Hoot-owl restrictions may apply in summer.
Bait Restrictions
Artificial flies and lures only.
Notes
Watch for low water conditions in summer.
Always verify current regulations with Montana fish and wildlife agency before fishing. Regulations can change annually.
Fly Shops & Guides Near Jefferson River
Local Fly Shops
- Four Rivers Fishing Company - Twin Bridges
- Frontier Anglers - Dillon
- Bozeman Anglers
Guide Services
- Four Rivers Guide Service
- Jefferson River Outfitters
- Montana Trout Guides
Optimal Fishing Conditions
Optimal Flow
800 - 2000 CFS
Best fishing conditions
Optimal Water Temperature
50° - 65°F
Ideal for active trout
Other Montana Trout Rivers
Bitterroot
Blackfoot
Yellowstone (inside YNP)
Madison
Missouri (below Holter)
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