Fly Fishing Southwest Montana: Madison River to Yellowstone National Park with Casteel Fishing

Fly fishing in southwest Montana centers on the Madison River and its connection to Yellowstone National Park, as shown in Casteel Fishing’s documented road-trip. The Madison runs about 140 miles across Montana before entering the Missouri near Three Forks and is managed under Montana Fish, Wildlife & Parks rules that vary by section, including areas limited to catch-and-release and restrictions on artificial lures. Anglers need to consult the current FWP regulation booklet before fishing to avoid mistakes that carry the same consequences as intentional errors. Yellowstone operates under a separate permit system, requiring a Yellowstone-specific fishing permit obtainable at ranger stations or visitor centers inside the park. Several drainages are closed to protect native Yellowstone cutthroat trout. Timing is also crucial: June runoff can make water too high and muddy, though salmonfly and golden stonefly hatches can be exceptional when conditions align with falling flows.