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Hatch Chart


The following represents major hatches as they occur in the area. Before streams clear, drop and warm sufficiently for hatches to appear consistently, anglers should fish nymphs and streamers. Early season hatches will appear at the warmest time of the day. As air and water temperatures rise during the season, hatches will occur earlier in the day. Late season angling (September/October) is often most productive with large nymphs and streamers as spawning fish become more territorial.



STONEFLIES
Salmon Fly -- (Pteronarcys californica)
Progressive hatch moving upstream several miles per day as water temperatures rise.
Henry's Fork River May 20 to June 15
Madison River --
Ennis to Hebgen Dam
June 25 to July 15
Yellowstone RiverJuly
Gallatin RiverJune 15 to July 15

Golden Stone -- (Hesperoperla pacifica)
Henry's Fork River July
Madison RiverJuly
Yellowstone RiverJune 20 to July 20
Gallatin RiverJuly

Yellow Sally -- (Isoperia & Suwallia pallidula)
Firehole River June
Madison RiverJuly 15 to August 15
Gallatin RiverJuly 15 to August 15
Henry's Fork RiverJuly 20 to August 10


MAYFLIES
Pale Morning Duns -- (Ephemerella inermis & infrequens)
Firehole RiverJune 1 to July 10
Madison River (YNP)June 10 to July 15
Henry's Fork RiverJune 1 to August 31
Madison RiverJuly 1 to August 15
Yellowstone RiverJuly 15 to September 10

Western Green Drake -- (Ephemerella grandis)
Henry's Fork RiverJune 20 to July 5
Madison River (YNP)June 15 to July 10

Brown Drake -- (Ephemera simulans)
Henry's Fork RiverJune 25 to July 10
Gibbon RiverJune 25 to July 10

Small Western Green Drake -- (Ephemerella flavilinea)
Henry's Fork RiverJuly 5 to July 30
Madison RiverJuly 15 to August 10
Yellowstone RiverJuly 20 to August 10

Gray Drake -- (Siphlonurus occidentalis)
Slough CreekJuly 15 to September 15
Yellowstone RiverJuly 15 to September 15

Callibaetis -- (Callibaetis americanus)
Hebgen LakeJuly 15 to September 15
Henry's Fork RiverAugust to September 15

Trico -- (Tricorythodes minutus)
Hebgen LakeJuly 10 to September 15
Madison RiverAugust 1 to September 30
Henry's Fork RiverAugust 1 to September 30

Blue Wing Olive -- (Baetis, many species)
Firehole RiverJune, September, October
Henry's Fork RiverJune, September, October
Madison RiverSeptember 1 to October 15
Yellowstone RiverAugust 1 to October 30


CADDIS - many species
Firehole RiverJune 5 to July 15,
September 10 to October 20
Henry's Fork RiverJune 1 to September 10
Madison RiverJune 25 to August 20
Gallatin RiverJuly 1 to August 20
Yellowstone RiverJuly 15 to August 30


TERRESTRIALS - Hoppers, ants, beetles, crickets
All streamsJuly 20 to September 15


P.O. Box 530 - 39 Madison Avenue West Yellowstone, MT 59758
TEL: 406-646-7801   -   FAX: 406-646-9370
Email: info@budlillys.com
Dick Greene Montana Outfitter #6396 - Idaho Outfitter #8245
Permitted in Gallatin and Targhee National Forests and Yellowstone National Park

Questions? Call 1-800-854-9559  

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