Big Sky to Gallatin Gateway, Montana

Gallatin River Fishing Report

Gallatin River | Big Sky to Gallatin Gateway, Montana | Updated Sep 13, 2026, 7:00 AM MDT | Station: Gallatin River above Deer Creek, near Big Sky, MT

Dead-drift tight against riffle seams and drop-offs with a subtle micro-strike indicator.

Forecast timing & sources
Forecast generated
Sep 13, 2026, 7:00 AM MDT
Valid until
Sep 14, 2026, 7:00 AM MDT
Source updated
Sep 13, 2026, 7:00 AM MDT
Flow observation
Observed Sep 13, 2026, 6:30 AM MDT
Water temperature observation
Observed Sep 13, 2026, 6:30 AM MDT

Buggin combines river and weather signals into a fishing forecast. A rating is model guidance, not a catch guarantee. Observation times can differ from forecast generation.

Configured gauge: Gallatin River above Deer Creek, near Big Sky · 06043120. The forecast point may differ from the gauge location.

Open in BugginFull Forecast

Today's Read

Clear, low autumn water on the Gallatin requires delicate presentations and realistic subsurface imitations as trout key on active nymphs and midges.

Bugs & Best Matches

What's active
Fish this
Baetis, size 16-20, Midday (10:00 AM–2:00 PM)
Pheasant Tail, size 16-20, dry; Sparkle Dun, size 16-20, dry; RS2, size 16-20, dry
Midges, size 18-22, Midday (10:00 AM–2:00 PM)
Zebra Midge, size 18-22, dry; Griffiths Gnat, size 18-22, dry; Midge Pupa, size 18-22, dry
Caddis, size 16-18, Midday (10:00 AM–2:00 PM)
Elk Hair Caddis, size 16-18, dry; Caddis Pupa, size 16-18, dry; Deep Sparkle Pupa, size 16-18, dry
Terrestrials, size 14-16, Variable
No matching fly supplied
Stoneflies, size 10-14, Variable
No matching fly supplied

What Is Driving The Feed

  • Baetis, size 16-20, Midday (10:00 AM–2:00 PM)
  • Midges, size 18-22, Midday (10:00 AM–2:00 PM)
  • Caddis, size 16-18, Midday (10:00 AM–2:00 PM)
  • Terrestrials, size 14-16, Variable
  • Stoneflies, size 10-14, Variable

Current Conditions

Flow241 cfs and falling
Water Temp49°F
WeatherClear Night
Rating6/10 · Fair