Regional spawn calendar
Mountain West / Rockies Trout Waters spawn calendar.
7 species with documented spawn timing in Mountain West / Rockies Trout Waters. Spawn timing is driven by water temperature — these calendar windows reflect the typical years when water reaches each species' threshold.
All species
Mountain West / Rockies Trout Waters spawn windows.
- Largemouth BassMicropterus salmoidesTypical window: Late May – Late JuneTypical window: Late May – Late June
Mountain reservoir bass spawn delayed by elevation and cold water.
- WalleyeSander vitreusTypical window: Mid-April – Early JuneTypical window: Mid-April – Early June
Mountain reservoir walleye spawn delayed by elevation.
- Northern PikeEsox luciusTypical window: Mid-April – Mid-MayTypical window: Mid-April – Mid-May
Mountain pike waters spawn later due to ice persistence.
- Rainbow TroutOncorhynchus mykissTypical window: Late April – Late JuneTypical window: Late April – Late June
Mountain West wild rainbow streams peak in May–June; ice-out and runoff dependent.
- Brown TroutSalmo truttaTypical window: Mid-October – Late NovemberTypical window: Mid-October – Late November
Mountain West browns (Madison, Yellowstone) peak late October–November.
- Lake TroutSalvelinus namaycushTypical window: Mid-October – Mid-NovemberTypical window: Mid-October – Mid-November
Mountain West deep lakes peak late October–early November.
- Cutthroat TroutOncorhynchus clarkiiTypical window: Late April – Late JuneTypical window: Late April – Late June
Yellowstone, Snake River, Colorado River cutthroat subspecies peak May–June.
Mountain West / Rockies Trout Waters spawn alerts.
Bield: Fish ties USGS gauges in your area to species spawn thresholds — get notified the day water temperature hits pre-spawn for your target.
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