October 13, 2026 | Freestone Fly Shop | Hamilton, Montana
Fall Fly Fishing on the Bitterroot River — October Dry Flies, Baetis & Streamers
Fall is in full swing here in the Bitterroot Valley, and October is one of our favorite times to be on the water. Crisp mornings, changing cottonwoods, and fewer anglers make for a classic Western Montana fly fishing experience.
As water temperatures cool, trout begin settling into their fall feeding patterns. The key this time of year is patience, timing, and paying attention to the changing conditions throughout the day.
Dry fly fishing remains a major attraction, especially when Baetis begin coming off. Cloudy afternoons can provide some of the best opportunities to find rising fish, while streamers and nymphs can keep anglers in the game between hatches.
What's Working on the Bitterroot
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Baetis (BWOs): Size 18–22. Watch for rising fish during the warmer part of the afternoon, particularly under overcast skies.
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Mahogany Duns: Size 14–18. Worth keeping in the box for fall mayfly activity.
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October Caddis: Size 8–12. Try larger caddis patterns along banks and softer edges.
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Nymphs: Pheasant Tails, Perdigons, and small mayfly nymphs can be productive when fish aren't rising.
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Streamers: Sculpin patterns, Woolly Buggers, and smaller articulated streamers are good options for searching deeper runs and structure.
Where to Focus
With cooler fall temperatures, there's generally no reason to rush to the river at daylight. Late morning through the afternoon can offer the best window for activity.
Concentrate on slower seams, walking-speed runs, and soft water adjacent to deeper holding areas. When Baetis are hatching, look closely at the slicks and tailouts for subtle rises.
For streamer anglers, work undercut banks, structure, and deeper buckets with a deliberate presentation.
