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This is by no means a comprehensive list of all aquatic insects found in Western trout streams, instead we have highlighted those hatches that are most important to us as fly fishers. Below each chart you will find information about each insect and the most effective patterns to imitate them.
Western Hatch Charts
Mayflies of the West
Little Blue Winged Olive
Baetis spp
Time of Year
Feb-Nov
Hatch Time
Morning and Evening
Pale Morning Dun
Ephemerella dorthea
Time of Year
April-October
Hatch Time
Late morning-early afternoon
Western Green Drake
Drunella spp.
Time of Year
May-July
Hatch Time
Late-morning or afternoon
Trico
Tricorythodes
Time of Year
June-Sept
Hatch Time
Morning
Speckled Dun
Callibaetis spp.
Time of Year
June-Sept
Hatch Time
Afternoon-Dusk
Caddisflies of the West
Coming Soon!
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