Lactarius olympianus
Family Russulaceae · Updated October 2026
77US records
8states
Augbusiest month
77 US records since 1948 (14 in the last 10 years)
Last seen Aug 12, 2023 (about 3 years ago) near Ward, Boulder County, CO, a preserved specimen in Denver Botanic Gardens, Sam Mitchel Herbarium of Fungi. Most US records come from Colorado, Washington and Alaska, and the busiest months are Aug, Sep and Jul. (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: Aug, Sep, Jul.
Where it's recorded
| State | Records | Latest sighting |
|---|---|---|
| Colorado | 44 | Aug 12, 2023 |
| Washington | 22 | Oct 5, 2019 |
| Alaska | 4 | Aug 22, 2009 |
| Utah | 2 | Jul 31, 2021 |
| Oregon | 2 | Oct 12, 2018 |
| Idaho | 1 | Sep 6, 2008 |
| Kansas | 1 | – |
| Wyoming | 1 | Aug 12, 1987 |
Top counties
- Boulder County, CO (12) · latest Aug 12, 2023
- Pitkin County, CO (8) · latest Aug 2, 2019
- Clallam County, WA (8) · latest Oct 19, 2001
- Grand County, CO (6) · latest Aug 14, 2021
- Clear Creek County, CO (6) · latest Aug 10, 2019
- Pierce County, WA (6) · latest Aug 11, 1975
- Lake County, CO (3) · latest Jul 29, 1976
- Summit County, CO (3) · latest Aug 26, 1994
- Eagle County, CO (3) · latest Jul 28, 1977
- Jefferson County, WA (3) · latest Sep 19, 2000
More on this species from GBIF.
Bring along
🍄
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.