Skip to content
Bield:Fish
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.

Spawning now — May

  • Largemouth Bass
    Late May – Late June

    Bedding largemouth bass are highly vulnerable to angling stress — they are physiologically committed to nest defense and will continue to attack lures even when exhausted. Catch an…

  • Northern Pike
    Mid-April – Mid-May

    Pike populations are robust in most northern waters and few states impose spawn-period closures. The fish recover quickly from C&R if handled well — keep them wet, use heavy gear t…

All species — Mountain West / Rockies Trout Waters

  • Largemouth BassMicropterus salmoides
    Typical window: Late May – Late June
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Outside spawn windowAprApr — Pre-spawn — water rising toward 60°FMayMay — Peak spawn (63–68°F)JunJun — Peak spawn (63–68°F)JulJul — Post-spawn — water at 75°F+AugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical window: Late May – Late June

    Mountain reservoir bass spawn delayed by elevation and cold water.

  • WalleyeSander vitreus
    Typical window: Mid-April – Early June
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Outside spawn windowAprApr — Outside spawn windowMayMay — Outside spawn windowJunJun — Outside spawn windowJulJul — Outside spawn windowAugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical window: Mid-April – Early June

    Mountain reservoir walleye spawn delayed by elevation.

  • Northern PikeEsox lucius
    Typical window: Mid-April – Mid-May
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Outside spawn windowAprApr — Outside spawn windowMayMay — Outside spawn windowJunJun — Outside spawn windowJulJul — Outside spawn windowAugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical window: Mid-April – Mid-May

    Mountain pike waters spawn later due to ice persistence.

  • Rainbow TroutOncorhynchus mykiss
    Typical window: Late April – Late June
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Pre-spawn — water rising toward 42°FAprApr — Peak spawn (45–52°F)MayMay — Peak spawn (45–52°F)JunJun — Peak spawn (45–52°F)JulJul — Post-spawn — water at 55°F+AugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical window: Late April – Late June

    Mountain West wild rainbow streams peak in May–June; ice-out and runoff dependent.

  • Brown TroutSalmo trutta
    Typical window: Mid-October – Late November
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Outside spawn windowAprApr — Outside spawn windowMayMay — Outside spawn windowJunJun — Outside spawn windowJulJul — Outside spawn windowAugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical window: Mid-October – Late November

    Mountain West browns (Madison, Yellowstone) peak late October–November.

  • Lake TroutSalvelinus namaycush
    Typical window: Mid-October – Mid-November
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Outside spawn windowAprApr — Outside spawn windowMayMay — Outside spawn windowJunJun — Outside spawn windowJulJul — Outside spawn windowAugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical window: Mid-October – Mid-November

    Mountain West deep lakes peak late October–early November.

  • Cutthroat TroutOncorhynchus clarkii
    Typical window: Late April – Late June
    JanJan — Outside spawn windowFebFeb — Outside spawn windowMarMar — Pre-spawn — water rising toward 43°FAprApr — Peak spawn (45–50°F)MayMay — Peak spawn (45–50°F)JunJun — Peak spawn (45–50°F)JulJul — Post-spawn — water at 55°F+AugAug — Outside spawn windowSepSep — Outside spawn windowOctOct — Outside spawn windowNovNov — Outside spawn windowDecDec — Outside spawn window
    Typical 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.

Download Bield: Fish
← All spawn calendars