yellowstone-river

Yellowstone River (Yellowstone National Park) is a river in Wyoming.

It ranks #4 among the 11 waters of Wyoming in the registry, and is of national prominence.

Its official name is Yellowstone River.

Also called Yellowstone River in Yellowstone Park and The Yellowstone.

Fished for trout (inferred from the species listed).

Species: cutthroat trout, rainbow trout, brown trout and mountain whitefish.

USGS GNIS record: 1035255.

It shares a watercourse with Yellowstone River (Montana), Montana.

Stretches: Black Canyon of the Yellowstone, Grand Canyon of the Yellowstone, Yellowstone Lake to Upper Falls and Thorofare.

Features: Yellowstone Lake.

Buffalo Ford (hole). It is fishable and wade only. Firehole Ranch: 'the water around Buffalo Ford and LeHardy Rapids' is a spot-and-stalk reach below Yellowstone Lake.

Lamar River confluence (confluence). It is fishable. Montana Angler: the Lamar enters just below the road bridge in the Black Canyon section and is the largest sediment producer in the drainage. Shared with the Lamar River record.

LeHardy Rapids (hole). It is fishable and wade only. Firehole Ranch: named with Buffalo Ford. Also called Le Hardy Rapids.

Knowles Falls (feature). It is fishable. Montana Angler: the lower end of the Black Canyon, below Knowles Falls, holds rainbows and browns.

Lower Falls (feature). Firehole Ranch: 308-foot drop; the Grand Canyon of the Yellowstone begins below the falls.

Upper Falls (feature). Montana Angler section heading end ('Yellowstone Lake to Upper Falls').

Sourced from 1 independent fly site.

Sources: fireholeranch.com (retrieved 2026-10-20) and Montana Angler (retrieved 2026-10-20).

Hatches

Terrestrials (hoppers)

Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug hatching, peak
  9. Sep hatching, peak
  10. Oct
  11. Nov
  12. Dec

Peak: August 1 - September 30

Most productive after the big stoneflies fade.

Sources: Montana Angler, fireholeranch.com

Hydropsyche Caddis (Hydropsyche)

Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun hatching, peak
  7. Jul hatching
  8. Aug hatching, peak
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Peak: June 15 - August 15

Sources: fireholeranch.com

Golden Stonefly

Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul hatching, peak
  8. Aug hatching
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Peak: begins first week of July (Grand Canyon)

Sources: Montana Angler

Blue-Winged Olive (Baetis)

Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug hatching, peak
  9. Sep hatching, peak
  10. Oct
  11. Nov
  12. Dec

Peak: August 25 - September 30

Sources: fireholeranch.com

Salmonfly

Stage: adult. Sourced. Sources give different windows; this shows the range.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun hatching
  7. Jul hatching, peak
  8. Aug hatching
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Peak: hatch begins first week of July in Grand Canyon

Reported windows differ: one source gives June 1 to July 25; another says the Grand Canyon of the Yellowstone fishes from the first week of July, with the longest big-stone hatch in the Park, lasting to August 6 in cool or high years but usually fading in the second half of July; the Black Canyon hatch comes slightly earlier.

Sources: Montana Angler, fireholeranch.com

Gray Drake

Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul hatching, peak
  8. Aug hatching, peak
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Peak: July 15 - August 15

Sources: fireholeranch.com

Green Drake

Sourced.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun hatching, peak
  7. Jul hatching, peak
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Peak: June 15 - July 31

Sources: fireholeranch.com

Access, closures and rules change; check with the state agency before you go.