PNW Mushroom Fruiting Calendar When to find edible mushrooms in Oregon & Washington
The Pacific Northwest has two major mushroom seasons. Spring runs from March through June, starting at low elevations and moving into the mountains. Fall kicks off with the return of rain in September and peaks in October with the highest abundance and diversity of the year.
The charts below show relative fruiting patterns based on research-grade iNaturalist observations from Oregon and Washington. Weather, elevation, proximity to the coast, and which side of the Cascades you’re on will shift these windows significantly in any given year.
Foraging elsewhere in the West? California’s season peaks in December and January, not October: see the California mushroom calendar, or find month-by-month calendars for towns from British Columbia to Arizona on the mushroom calendar by town pages.
Reading the charts
Taller bars mean more research-grade iNaturalist observations that month, scaled to that mushroom’s own busiest month, so bars can’t be compared between mushrooms. Observations also reflect when people are out looking. These show relative patterns, not exact counts — use them to plan your season, not predict a specific week.
Spring
Plan your spring forays with real-time soil data
Forayz shows soil temperature, soil moisture, and precipitation — the conditions that drive morel and oyster mushroom fruiting across the PNW.
Summer
Fall
October is the peak of PNW mushroom season. Fall rain brings most edible groups into fruit.
Track fall conditions from Washington to California
Forayz layers precipitation, soil moisture, and soil temperature over the map — dial in your timing for chanterelles, boletes, matsutake, and more.
Late Fall & Winter
Several species keep fruiting after the main October peak, extending the season into December and beyond in mild coastal areas.
Sources: Mushrooms of Cascadia (Siegel & Schwarz, 2024); MycoMatch (© Ian Gibson), a compilation of published descriptions through which most other field-guide authors named here are quoted; Danny’s DNA Discoveries and the PNW Pictorial Key (© Danny Miller); iNaturalist observations.