Gallatin River Fishing Report
Gallatin River Fishing Report
10/23/26
Late October fishing is here, and the Gallatin is still a great option for getting out on the water. Cooler mornings and shorter days mean trout are starting to settle into slower, deeper water. Nymphing has been the most consistent way to find fish, while streamers and small dry flies can make for some great fishing when conditions line up.
On the Gallatin near Big Sky, focus on deeper runs, slower seams, and the edges of faster water. Fish are less likely to be holding in the fastest riffles as water temperatures drop. Take your time working these areas and make sure your flies are getting down to where the fish are holding.
Blue-winged olives are still worth watching for, especially on cloudy afternoons. If you see fish rising, try a small BWO pattern in a size 18–22. You may not see fish feeding on top throughout the day, so don't be afraid to switch back to nymphs when the surface activity slows down.
Streamers are another good option this time of year, especially if you're looking to target larger trout. Try olive, black, or brown patterns around deeper pools, banks, and structure. With colder temperatures, there's no need to rush out at first light. Late morning through the afternoon can offer some of the better opportunities.
Unsure what to use on the Gallatin today? Check out our pattern suggestions below or swing by our shop in Big Sky for some advice!
Dries: Parachute Adams #16–18, Parachute BWO #18–22, Elk Hair Caddis #14–18
Nymphs: Pat's Rubberlegs (Black, Coffee, Brown, Olive) #8–12, Lightning Bug #16–20, Little Green Machine #18–20, Pheasant Tail #16–20, Zebra Midge #18–22
Streamers: Boogieman (Rootbeer) #4, Galloup's Two Tone Dungeon #4–8, Double Screamer (Olive, Black, Gold) #6, Woolly Bugger (Olive, Black) #10, Sparring Partner (Black/Purple) #6
Our Fly Fishing Guide School has helped lots of anglers work toward their dream of becoming a fishing guide. With schools throughout the spring and fall, there are opportunities to build your skills and gain real experience on Montana rivers. Check out our Montana Fishing Guide School to become a more rounded angler or take the next step toward a career in the industry.
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Updated Gallatin River fishing reports brought to you from our backyard in beautiful Big Sky, Montana. We know this river like the back of our hands.
