Bighorn Rundown: Nymphs Dominate, Streamers Heat Up as Temps Cool in October 2025

Good morning from the banks of the Bighorn—Artificial Lure here with your fall fishing rundown for October 15th, 2025. Weather’s been typical October Montana: scattered rain showers rolled through yesterday, but things are drying out fast. Today we’re headed for a sunny stretch, with a high in the mid-60s, northwest winds at 10 to 20, and that unmistakable crispness in the air. Lows drift down to the low 40s tonight, so stash a jacket if you’re after an evening bite. Sunrise hit the cottonwoods at 7:21 a.m., and you’ll fish until about 6:33 p.m. before last light on the water. No tidal swings—just pure river action, as you’d expect up here. The Bighorn River is running clear and steady, and fishing’s been reliable. According to the crew at Montana Outdoor, nymphs are still king. Think sowbugs, scuds, and those smaller dark perdigons fished deep in the main runs and slower edges. A classic rig pairing a sowbug or a worm pattern with a small mayfly nymph is producing steady numbers—just remember to flick the moss off your flies every few casts to stay in the game. Streamer action is heating up with the cooling temps—sparkle minnows, skiddish smolts, and anything that looks like a disoriented sculpin are making big browns take notice, especially low and slow along deeper ledges and submerged timber. Best windows are cloudy days and the first hour or two after sunrise, so set the alarm and don’t hit snooze. There’s a sprinkle of dry fly action on calm afternoons, mainly midges and small mayflies, but don’t bank your whole trip on topwater. Still, pack a few small dries or emergers—just in case you run into some risers tucked in a side channel out of the breeze. Recent catches are heavy on healthy rainbows, lots of chunky 16- to 20-inchers sliding into the net along with the occasional beefy brown. Nymphing is putting up steady numbers, but those hunting for a trophy are slinging streamers in the morning or dusk and connecting with some quality fish. Here’s your shortlist for what’s been producing: - **Tailwater sowbug** - **Black Lite Brite Perdigon** - **Sparkle minnow (especially olive and gold)** - **Black Zebra midge** - **Orange scud** - **Skiddish smolt** - **Gray Gonga** (for those big streamer swings) On bait, if you’re working side channels or slow pockets from shore, a well-presented nightcrawler on a small hook will still entice opportunistic trout, but fly or artificial lures clearly outpace bait for numbers right now. Hot spots? Start at the Afterbay section and drift toward Soap Creek—steady numbers all week. Another under-the-radar spot is the stretch above Three Mile, especially in the afternoons when boat traffic is lighter. Wade anglers: upstream of Bighorn Access offers plenty of prime gravel bars and pocket water for nymphing. A quick reminder—flows are steady, but don’t be careless wading in the deep cuts, and keep an eye for patches of moss with the cool nights. That’s your Bighorn update—tight lines to everyone hea This content was created in partnership and with the help of Artificial Intelligence AI.