Wyoming
Yellowstone River
Latest report: Yellowstone National Park Fishing Report - August 27, 2026 — Big Sky Anglers, 4 days ago
Solunar · next 7 days
About Yellowstone River
This is the Yellowstone before it becomes the big Montana freestone — the headwater river inside the national park, in Wyoming. It leaves the Thorofare, fills Yellowstone Lake, and pours out at Fishing Bridge as a wide, clear, meadow river that cuts through Hayden Valley before dropping into one of the deepest canyons in the country. What draws fly fishermen here is a single fish: the native Yellowstone cutthroat trout. This is quality-over-quantity water. On the famous glide at Buffalo Ford — officially renamed Nez Perce Ford — a good day might be a handful of fish, but a high percentage run 16–22 inches, with fish over 20" common and the occasional 24–26" cutthroat taken most weeks. The whole reach is catch-and-release for natives, barbless, artificial-only, lead-free, and closed to boats, so it is walk-and-wade only.
The character splits hard by reach. From the lake outlet down through Hayden Valley the river is broad, flat, and mostly shallow — long glides with little structure where you sight-fish cruising cutthroat on bright, calm days, then settle in for the drake and PMD hatches. It is forgiving wading with easy roadside access off the Grand Loop Road, which also makes it the most-fished cutthroat water in the park. Below the Upper and Lower Falls the river disappears into the Grand Canyon of the Yellowstone — 1,000-plus feet of near-vertical walls, brutal switchback hikes, and resident cutthroat that run smaller (8–16") but see almost no anglers. Farther down, below the Lamar confluence, the Black Canyon opens up a little: fewer walls, bigger and fatter fish, increasing rainbows and whitefish, and browns below Knowles Falls, reached only on foot via the Yellowstone River Trail.
The context that matters most is that this fishery is a conservation story in progress, and it is worth being honest about it. Illegally introduced lake trout in Yellowstone Lake, compounded by whirling disease, collapsed the cutthroat population — anglers who fished Buffalo Ford in its heyday describe it as a shadow of what it was, with numbers still down roughly 80% from historic peaks. The park's aggressive lake-trout suppression netting has the population slowly recovering and the fishing trending back up, but this is not the wall-to-wall cutthroat river of old-timers' stories. The upper river also opens late: the Fishing Bridge-to-Falls stretch stays closed until July 15 to protect spawning cutthroat, so early-season plans have to look elsewhere — the Firehole, Madison, or Gardner. Nearest bases are Gardiner, MT at the north entrance, Cody, WY over the east side, and West Yellowstone for the park's west waters.
Species
- Yellowstone Cutthroat Trout
- Rainbow Trout
- Brown Trout
- Brook Trout
- Mountain Whitefish
- Arctic Grayling
| Species | Abundance | Best Season | Size |
|---|---|---|---|
| Yellowstone Cutthroat Trout | Primary | mid-Jul–Sep | 8–22" (to 26") |
| Rainbow Trout | Present | Jul–Oct | 8–16" |
| Brown Trout | Localized | Sep–Oct | 12–20" |
| Brook Trout | Localized | Jul–Sep | 6–12" |
| Mountain Whitefish | Common | year-round | 10–16" |
| Arctic Grayling | Rare | summer | 8–14" |