Yellowstone Fish Report Fish Report for 9-19-2025
Yellowstone has been fishing well, all hoot owl restrictions have been lifted
Yellowstone Fish Report

by Mike Lawson
9-19-2025
208-558-7525
Website
Yellowstone has been fishing well, all hoot owl restrictions have been lifted, and the fish seem to appreciate the cooler water temperatures. We have been starting to see runners in Madison. Remember, while targeting these fish, the most effective flies will be nymphs and streamers. The recommended flies are rubber legs, olive bullet quills, zebra midges, and leeches. You can also try your favorite streamer patterns; any baitfish imitation should yield some success.
The Firehole has also been productive with caddis hatches here and there, as well as good nymphing and soft hackle opportunities. Recommended flies: White Miller Caddis, Baetis, Waltz Worm nymphs, and Pheasant Tails.
The Gallatin within YNP is relatively low, but it is still fishing well despite that. Be stealthy with your presentation and consider sizing down in tippet—recommended flies: Terrestrials, Ants, Beetles, Hoppers. Consider dropping a small nymph off your dry; a CDC Pheasant Tail or olive bullet quills seem to get the job done on the Gallatin.
If you want to find cutthroat trout predominantly, consider checking out the NE corner of the park. The Lamar, Slough Creek, and Soda Butte remain in good shape, with great opportunities for late-season terrestrial fishing. You may also come across some lovely drake hatches in this region—recommended flies: Hoppers, Ants, Beetles, Drakes. With the cooler nighttime temperatures we have been seeing, don’t be afraid to throw a dropper on in the morning on these rivers.
More Reports
Henry's Fork Anglers Reports
for Friday, September 19th
Henrys Fork- Box Canyon : The upper river is coming out of Island Park Reservoir at 345 CFS
Henrys Fork- Warm River to Ashton: The lower Henrys is flowing at 1010 CFS near Ashton
Snake River- South Fork: The flow near Irwin is at 8030 CFS, with some fluctuations still occurring
Madison River : Some localized caddis hatches are occurring, but terrestrials will still be the name of the game on the Madison
Teton River: The Teton is running on the low end, 361cfs near St Anthony
Henry's Fork Anglers Reports
for Friday, August 22nd
Henrys Lake: Flows from Island Park Reservoir are now holding steady around 780 CFS
Henrys Fork- Ashton to St Anthony: Hopper fishing remains strong, especially through the mid and lower stretches
Snake River- South Fork: The hopper bite is excellent right now
Madison River : The Madison is in late-summer mode—hopper/dropper rigs are the go-to for covering water
Teton River: The upper Teton continues to fish well with PMDs and terrestrials
Yellowstone Fish Report: Warm water closures remain in place for the Madison, Firehole, and Gibbon

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