Russula sierrensis
Family Russulaceae · Updated October 2026
34US records
6states
Octbusiest month
34 US records since 1975 (8 in the last 10 years)
Last seen Oct 17, 2025 (about 12 months ago) near Port Angeles, Clallam County, WA, a preserved specimen in INSDC Sequences. Most US records come from Washington, Idaho and Oregon, and the busiest months are Oct, Sep and Nov. (Data as of October 26, 2026; records can lag by weeks.)
⚠ Never eat a wild mushroom based on this site. We show where fungi have been recorded, nothing more. We never say any mushroom is edible or safe, and you shouldn't decide that from any website, app or photo. Many deadly mushrooms look like harmless ones. If someone may have eaten a wild mushroom, call Poison Control at 1-800-222-1222 right away.
Lookalike warning. Many mushrooms, including deadly ones, closely resemble each other, and the only reliable identification comes from an expert looking at the actual specimen (often with spore prints or microscopy). Never use a name, photo or record count on this page to decide what something is.
When it's recorded
Records by month, all years. Busiest: Oct, Sep, Nov.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Washington | 19 | Oct 17, 2025 |
| Idaho | 5 | Sep 22, 2006 |
| Oregon | 4 | Nov 22, 2001 |
| California | 4 | Dec 18, 2024 |
| New Mexico | 1 | Sep 21, 2025 |
| Colorado | 1 | Aug 12, 2024 |
Top counties
- Thurston County, WA (11) · latest Sep 22, 2001
- Bonner County, ID (5) · latest Sep 22, 2006
- Clallam County, WA (3) · latest Oct 17, 2025
- Pierce County, WA (2) · latest Oct 11, 1986
- Douglas County, OR (2) · latest Nov 14, 1983
- Lincoln County, OR (2) · latest Nov 22, 2001
- Columbia County, WA (2) · latest Oct 11, 1980
- Kittitas County, WA (1) · latest Oct 12, 1975
- Bernalillo County, NM (1) · latest Sep 21, 2025
- Inyo County, CA (1) · latest Oct 28, 2023
More on this species from GBIF.
Bring along
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Regional mushroom field guideSee on Amazon🍄
Folding mushroom knife with brushSee on Amazon🍄
Wicker foraging basketSee on Amazon🍄
10x hand lens / loupeSee on Amazon🍄
Spore print paperSee on AmazonAs an Amazon Associate we earn from qualifying purchases.