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Idaho Fly Fishing: July & August

Planning a trip to Teton Valley, Idaho? When is the best time to fly fish? In this series of posts we break down the fishing seasons here in the Tetons. What’s the fishing like in July & August? Pretty darn good. See what it’s like to fish with us in July and August in this post.

july and august fly fishing
It’s all smiles fishing the Tetons in July & August

July

From here on out it’s lock the doors, everyone wants in! Hatches out every day on all three rivers and we are in heaven. The options are seemingly endless and fishing is good everywhere. PMD’s on all the rivers, Stone Flies of every kind on the Teton and South Fork. Green Drake on the Teton and South Fork as well.

Salmon fly hatch takes over on the South Fork. The riffles are full of fish eating small mayflies. The Narrows also are filled with adult golden stones. The entire Teton fishes well on these large dries. Wade trips are great this time of year. The Henry’s Fork still fishes well, mostly in the canyon section with large dries and droppers as well as the flat water, for huge rainbows.

July fly fishing
Hooking one on the Teton.

August

As July wraps up the stoneflies taper off and the PMD’s thin out but are still around. The grass starts to turn more yellow than green and the grain fields are turning golden. The water levels come down a little and hoppers take over. All terrestrials for that matter. Cutthroat sipping big foam with your favorite dropper off the back is the name of the game. 

As the month rolls along the mutant Goldens emerge on the South Fork and make for exciting dry fly fishing for aggressive fish. Big Browns are hunting hoppers on the Henrys Fork and Cutties are fat and happy on the Teton.

big henry's fork brown trout august fly fishing
Big Henry’s Fork Brown

The South Fork and Narrows are filled with large hoppers. The infamous Chernobyl ant along with other hopper and large attractor patterns are fished to produce large numbers and large fish. The Narrows are very accessible to wading. Upper Teton fishing like it should, big rainbows and big cutthroats on anything from small dries to big hoppers.

Teton Valley Lodge Fishing by Season

January – April
May – June
September – November

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