Detroit Mushroom Calendar

Detroit sits in the Cascades and one of the wetter corners of the region, with roughly 93.6 inches of annual rainfall, most of it falling in the cool months from fall into spring. The ground warms and reaches early fruiting potential around April, by which point the average last frost (Mar 9) has usually passed. Summer fruitings stay confined to pockets of moisture — irrigated urban ground can be one — and the real abundance arrives with the fall rains in September. The first frosts around Dec 3 eventually close the main season, though hardy cool-season species hang on.

Best months September, October, and November
Ground warms ~April
Frost-free Mar 9 – Dec 3
Annual rain 93.6"
Driest July and August
Species tracked 2

What Fruits When Near Detroit

JFMAMJJASONDMorelregSpring KingregKing BoleteregMatsutakeregChanterelleHedgehogregOysterregLobsterBear's HeadregBlewitregThe PrinceregShaggy Manereg

Shading shows when each species typically fruits within about 10 miles, not abundance. Based on iNaturalist observation trends. reg = pooled from the surrounding area where local sightings were sparse.

The Shape of the Season

All species combined — local observations within about 10 miles, by month.

Weather Through the Year

Average daily high–low (°F)

Average monthly precipitation (inches)

The Forest Around Detroit

Dominant tree species within about 10 km — the hosts that shape which mushrooms grow here.

  • Douglas-fir63.9%
  • Western Hemlock26.1%
  • Red Alder5.9%
  • Bigleaf Maple4.1%

Species to Know Near Detroit

Lobster Lobster Peaks in September Photo: Drew Henderson, Mushroom Observer (CC BY-SA) Chanterelle Chanterelle Peaks in October Photo: Jeremy Collison (CC BY-NC)

Common Questions

When is mushroom season in Detroit?

Near Detroit, most mushroom activity arrives with the fall rains. The strongest months in the local observation record are September, October, and November.

When do morels fruit near Detroit?

Morel reports in the surrounding region peak in May. Timing tracks soil temperature, so south-facing slopes and lower elevations start earlier and higher ground runs later.

What mushrooms grow near Detroit?

2 species show up in the observation record within about 10 miles of Detroit, including Chanterelle, Lobster. The calendar above shows when each one typically fruits.

Want live conditions instead of climatology? The Forayz map layers soil moisture, soil temperature, snow cover, and recent burns over the same area.

Nearby Calendars in Oregon

Climate normals: NOAA NCEI U.S. Climate Normals (1991–2020). Season-onset timing is an air-temperature proxy, not a soil reading.