Daily River Forecast

Gallatin River

Big Sky to Gallatin Gateway, Montana

Gallatin River | Big Sky to Gallatin Gateway, Montana | Updated June 15, 2026 | Station: Gallatin River above Deer Creek, near Big Sky

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How To Fish It

  • Use enough weight to tick bottom quickly in short drifts. The Gallatin rewards efficient high-sticking more than long dead drifts.
  • Target cushion water behind midstream rocks, pocket tails, and the inside shelf below faster riffles.
  • When fish start rising, step into softer current and fish a small BWO or RS2 under a dry instead of forcing a big dry pattern.

Bugs & Best Matches

What's active
Fish this
Blue-winged olives, size 18-20, midday on overcast days
BWO Sparkle Dun, size 18-20, dry; RS2 olive, size 20-22, emerger
Midges, size 18-22, early and late in slower water
RS2 olive, size 20-22, emerger
Small black stoneflies, size 14-16, afternoons near banks and rough edges
Pat's Rubber Legs, size 8-10, nymph
General subsurface
Frenchie, size 16-18, nymph; Perdigon olive or black, size 16-18, nymph; Parachute Adams, size 16-18, dry

Current Conditions

FlowSpring flow is usually clear in the upper canyon but can rise fast with warm weather or dirty tributary input lower down.
Water TempCold water keeps fish grouped in softer current breaks and short feeding lanes.
WeatherClouds help the hatch. Bright sun usually pushes the better fish deeper or tighter to structure.
Rating6/10

Today's Feeding Pattern

Gallatin trout in late April usually hold in short, defined pockets where they can feed without spending energy in the main push. Most fish will eat a good nymph drift before they will move far for a dry. Surface action is real on the right afternoons, but it tends to be concentrated in softer edges, protected tailouts, and any place current slows enough for BWOs and midges to collect.

About The Gallatin River

The Gallatin starts in Yellowstone National Park and fishes through a long canyon corridor near Big Sky before flattening out toward the valley. Most anglers know it for easy roadside access, cold clear water, and technical pocket-water trout fishing.

Rainbow and brown trout make up most of the catch, with cutthroat higher in the system. It is a wading river first, and reading short feeding lanes matters more here than covering huge flats.

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Forecast powered by Buggin — a fly fishing app that predicts what fish are feeding on based on river and weather conditions.