Fruiting forecast

This is an estimate. It scores how favourable recent conditions are for a species to fruit, from 0 to 100. It does not know whether the mushroom is actually there, and a high score is not a promise you will find anything.

Each county (or Canadian census division) gets a score from four things, multiplied together:

• Season. When this species is usually reported, from open-licensed observation records in the US and Canada, smoothed by month.
• Soil temperature. We do not measure soil. We estimate it from daily air temperatures, averaged so it changes slowly the way soil does. Species are grouped by when they peak, and each group has a soil range it likes (spring 8–18 °C, summer 15–26 °C, fall 6–18 °C, cool season 2–12 °C).
• Rain. Rain over the last two weeks, counting rain from about 3 to 10 days earlier the most, because mushrooms tend to appear some days after rain.
• Frost. Hard frosts in the past week lower the score for summer and fall species.

If a species has no records in a state or province, its score there is 0.

Weather comes from NOAA (observed daily values from the PRISM 4 km grid via RCC-ACIS, and National Digital Forecast Database forecasts) and Environment and Climate Change Canada (station observations and city forecasts). Canadian forecast rain amounts are often estimated from the wording of the forecast. Each area uses the weather at one point near its centre, so conditions in your exact spot can differ. Data is updated once a day.

Labels: 0–19 Unlikely, 20–44 Possible, 45–69 Good, 70 and up Very good.

The forecast says nothing about whether a mushroom is safe to eat. Many edible mushrooms have toxic lookalikes. Never eat a wild mushroom based on this site or any app.

See safety basics and the disclaimer. Check the foraging rules for where you plan to go.