Updated September 24, 2026
Fall fishing is taking hold on the Bitterroot, and we’re entering one of our favorite stretches of the season. Cooler nights, comfortable water temperatures, and the arrival of our larger fall mayflies are creating some excellent dry-fly opportunities.
Current Conditions
The Bitterroot is clear and fishing well, but presentation is becoming increasingly important as we move deeper into fall. Recent reports show the river carrying better early-fall flows following September rain, with fish holding along riffle edges, grassy banks, deeper seams, tailouts, and slower flats.
Longer leaders, lighter tippet, and a good drag-free presentation can make a big difference, particularly when targeting rising fish.
Hatches
Tricos are still around in the mornings, although we're beginning to transition away from the heavy Trico fishing of late summer.
The bigger story now is the arrival of our fall bugs. Look for:
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Mahogany Duns
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Blue-Winged Olives
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Hecubas
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October Caddis
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Ants & Beetles
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Remaining Hoppers
Mahoganies and Baetis are becoming increasingly important during the afternoon, particularly when cloud cover rolls into the valley. October Caddis are also showing on the forks and upper river.
How We're Fishing
For us, this is the time of year to keep an eye out for rising fish rather than simply covering water.
During the morning, watch the slower slicks, tailouts, back eddies, and foam lines for Trico activity. As the day warms, terrestrials can still produce along grassy banks and structure.
When Mahoganies, Hecubas or BWOs start showing, don't be afraid to cut off the dropper and fish a single dry. Fall fish can get selective, and a clean presentation with a properly sized dry can be the difference.
A dry-dropper remains a dependable option when nothing obvious is happening on the surface. Streamer fishing is also beginning to improve as we move toward October.
Flies We're Fishing
Dries: Mahogany Sparkle Duns #14–16, Purple Haze #14–16, BWO Spinners #18–20, Parachute Adams #16–18, Brindle Chutes, October Caddis #8–12, small Chubbies, ants and beetles.
Nymphs: Jig Pheasant Tails #14–18, Duracells #14–16, Hare's Ears #14–16, Prince Nymphs #12–16, Perdigons and Rubberlegs.
Streamers: Sparkle Minnows, Sculpzillas, Thin Mints and smaller articulated patterns. Olive, yellow, white and natural sculpin colors are all worth having in the boat.
Freestone Fly Shop Tip
Slow down and look for feeding fish.
Fall on the Bitterroot rewards patience. Instead of pounding every bank, watch the slicks and seams for noses. When you find rising fish, lengthen your leader, lighten your tippet and concentrate on getting the first cast right.
Cool, cloudy afternoons are especially worth watching as Mahoganies and Blue-Winged Olives become more active.
Looking Ahead
We're moving into prime fall fishing on the Bitterroot. Tricos and terrestrials are gradually giving way to Mahoganies, BWOs, October Caddis and better streamer fishing.
For anglers who enjoy technical dry-fly fishing, fewer crowds and classic fall conditions in the Bitterroot Valley, the next several weeks can be some of the best fishing of the year.
Stop by Freestone Fly Shop in Hamilton for the latest river conditions, flies and local information before heading out.
