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Gallatin River Fishing Report 12.15.25

Dec-16-25 by Angela Montana

If winter fishing has been on your mind, the Gallatin is doing its thing right now. With less ice hugging the banks and the river looking more like late fall around Bozeman, there is still plenty of open water and willing fish—especially if you time it right. Midday has been the sweet spot, with trout holding deep and responding well to simple, effective nymph setups and the occasional well-placed streamer. Dry flies haven’t been much of a player, but solid winter tactics are producing consistent results. Fins & Feathers breaks down what’s working, where to focus, and how to dial it in for a productive day on the Gallatin below. And they score the Gallatin a 3/5 for fishability.

Current Conditions

The Gallatin River is fishing well right now. There is not as much ice along the banks as in the past few weeks, and it’s looking more like fall around Bozeman again, though the main channel remains open. Midday has been the best time to be out there.

Nymphing with attractor-style patterns has been working well. Rubberlegs, small stonefly nymphs, zebra midges, and slim perdigons like spanish bullets or blowtorches have all been good choices. A 9-foot fluorocarbon leader of 3X or 4X works well, with enough weight to keep flies down where fish are holding.

Fish have been sitting in the deeper water. Spending time in those sections with slower-moving water has been more effective than moving around or fishing shallow stretches, which haven’t offered much lately.

Streamer fishing is worth mixing in. Smaller sculpin-style and baitfish patterns have moved a few fish during the warmest part of the day. A shorter leader of 5–6 feet of heavier fluorocarbon (1X or 0X) helps keep things under control.

Dry-fly fishing has been very limited. Midges are around, but surface activity has been scarce.

Overall, the Gallatin River remains a solid winter option. Focus on the middle of the day, fish deeper water, and keep your setups simple for the most consistent results.

Addtional Gallatin River Fly Fishing Resources:

– Gallatin River Fly Fishing In Winter

– Fly Fishing Bozeman In Winter

Stream Flows

Gallatin River Fishing Report Streamflow

Flows

Recommended Flies

				  Prince Nymph

Prince Nymph

				  Rainbow spanish bullet

Rainbow Spanish Bullet

				  Great attractor pattern when fishing Yellowstone River in Montana.

Purple Psycho Prince

				  Use a Pats' Rubberleg for Madison River fishing in high-water.

Black Pat’s Rubberleg

				  Purple lite brite perdigon nymph

Purple Lite Brite Perdigon

				  Pats rubberleg bronw

Brown Pat’s Rubberleg

				  Zebra Midge Black Copper

Black Zebra Midge

				  Flashback Pheasant Tail TNG G Bd PT

Pheasant Tail

Photo: Danamallard51 from Getty Images