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Spawn timing & temperature guide

Cutthroat Trout spawn timing guide.

Oncorhynchus clarkiiColdwaterRedd (Gravel Nest) spawnerPeer-reviewed

The Cutthroat Trout spawn cycle is driven by water temperature, not calendar date — fish initiate spawn behavior when water reaches 43°F regardless of when that happens in your region. Cutthroat trout subspecies spawn in spring, with timing varying by elevation and subspecies. Fish stage in deeper pools and below-shoal habi

Cutthroat Trout spawn temperature gauge

Spawn behavior is driven by water temperature, not calendar date. The same cutthroat trout may spawn weeks earlier in southern range than northern — track water temp, not the date.

32°37°42°47°52°57°62°67°72°77°82°87°Peak 45–50°F
Pre-spawn — best fishingPeak spawn — conservationPost-spawn — recovery feeding·Dashed line = peak spawn boundaries

Cutthroat Trout spawn cycle

Pre-Spawn
40–43°F
Trophy fishing
Spawn
43–55°F (peak 45–50°F)
Conservation window
Post-Spawn
55–63°F (~14 days)
Recovery feeding
Summer Pattern
Above 63°F
Standard summer patterns

Phase-by-phase breakdown

Pre-Spawn

Trophy fishing window
40–43°F

Cutthroat trout subspecies spawn in spring, with timing varying by elevation and subspecies. Fish stage in deeper pools and below-shoal habitat as runoff begins.

Pre-spawn cutthroat are aggressive on streamers and large nymphs in pre-runoff conditions.

Spawn

Conservation window
43–55°F (peak 45–50°F)

Active spawning behavior. Redd spawners. Native subspecies (Yellowstone, Snake River, Bonneville, Greenback, Colorado River) all have distinct conservation status.

Many cutthroat subspecies are protected by C&R-only or limited harvest regulations year-round. Native cutthroat conservation is one of the most active fisheries restoration efforts in the West.

Conservation context

Many cutthroat subspecies are protected by C&R-only or limited harvest regulations year-round. Native cutthroat conservation is one of the most active fisheries restoration efforts in the West.

Post-Spawn

Recovery feeding
55–63°F (~14 days)

Post-spawn cutthroat recover for 2 weeks before resuming summer feeding patterns at higher elevation lakes and streams.

Dry-fly fishing for high-country cutthroat begins as post-spawn fish disperse to summer haunts.

Summer Pattern

Standard patterns
Above 63°F

Fish disperse to summer habitat and feeding patterns. Spawn cycle complete until following year.

Standard summer fishing tactics apply.

Regional spawn windows

Cutthroat Trout spawn timing varies by region. Southern range fish initiate spawn first; northern fish later.

  • Mountain West / Rockies Trout WatersLate April – Late June

    Yellowstone, Snake River, Colorado River cutthroat subspecies peak May–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
  • Pacific NorthwestLate March – Mid-June

    Pacific Northwest cutthroat subspecies (coastal, sea-run) peak March–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: Late March – Mid-June

Spawn habitat

  • Stream gravel
  • Tributary mouths in lakes
  • Cobble-gravel substrate
Typical depth: 1–3 ft
Male vs. female behavior

Redd spawners. Native subspecies (Yellowstone, Snake River, Bonneville, Greenback, Colorado River) all have distinct conservation status.

Closed seasons & regulations

The following states have closed seasons or restrictions for cutthroat trout during peak spawn:

Source

Hickman, T. and R.F. Raleigh. 1982. Habitat Suitability Index Models: Cutthroat Trout. USFWS Biological Report 82(10.5).

Source documentation →

Track water temp for cutthroat trout spawn timing.

Bield: Fish ties USGS gauge data and your saved species to spawn thresholds. Get notified when cutthroat trout hit pre-spawn temperature in your area.

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