Mushrooms in Jefferson County, Colorado
Fruiting now
Based on past sightings (mostly since 2011; all years where recent records are few), not a forecast. Weather and place matter a lot, and a listing here says nothing about whether a mushroom is safe.
Too few past records in January here to list species.
Usually recorded in February here:
Corkstar Puffball Mycenastrum corium6 February records across all years
Too few past records in March here to list species.
Usually recorded in April here:
- Corkstar Puffball Mycenastrum corium3 April records across all years
Usually recorded in May here:
Fairy Ring Champignon Marasmius oreades3 May records since 2011
Aspen Bracket Phellinus tremulae3 May records since 2011
Aspen Oyster Mushroom Pleurotus populinus2 May records since 2011
Glistening Ink-Cap Coprinellus micaceus2 May records since 2011
Dryad's Saddle Cerioporus squamosus2 May records since 2011
Lawyer's Wig Coprinus comatus2 May records since 2011
Usually recorded in June here:
Brown Hay Cap Panaeolina foenisecii3 June records across all years
Pale Oyster Pleurotus pulmonarius3 June records across all years
Red Tree Brain Fungus Peniophora rufa2 June records across all years
Baltazaria galactina2 June records across all years- Fairy Ring Champignon Marasmius oreades2 June records across all years
Petticoat Mottlegill Panaeolus papilionaceus2 June records across all years- Amanita crocea2 June records across all years
Poplar-Loving Ringless Amanita Amanita populiphila2 June records across all years
Rosy Earthstar Geastrum rufescens2 June records across all years
Collared Earthstar Geastrum triplex2 June records across all years
Usually recorded in July here:
Fly Agaric Amanita muscaria5 July records since 2011
Almond-Scented Russula Russula fragrantissima2 July records since 2011
Calocybe naucoria2 July records since 2011
Rosy Conk Rhodofomes cajanderi2 July records since 2011
Panther Cap Amanita pantherina2 July records since 2011
Small Funnel-Veil Amanita Amanita multisquamosa2 July records since 2011
Lentinellus micheneri2 July records since 2011
Bitter Brown Leucopax Leucopaxillus gentianeus2 July records since 2011
Laccaria nobilis2 July records since 2011
Usually recorded in August here:
Common Collybia Gymnopus dryophilus5 August records since 2011
Northern Cinnabar Polypore Trametes cinnabarina4 August records since 2011- Fly Agaric Amanita muscaria4 August records since 2011
Common Funnel Infundibulicybe gibba4 August records since 2011
Saffron Milk-Cap Lactarius deliciosus3 August records since 2011
False Chanterelle Hygrophoropsis aurantiaca3 August records since 2011
Flammulina populicola3 August records since 2011
Grisette Amanita vaginata3 August records since 2011
Booted Knight Tricholoma focale2 August records since 2011
Paxillus vernalis2 August records since 2011- Almond-Scented Russula Russula fragrantissima2 August records since 2011
Big Smoky Bracket Bjerkandera fumosa2 August records since 2011
Usually recorded in September here:
- Collared Earthstar Geastrum triplex4 September records across all years
Blushing Milkcap Lactarius controversus3 September records across all years
Beaked Earthstar Geastrum pectinatum3 September records across all years
Armillaria solidipes3 September records across all years
The Granulated Bolete Suillus granulatus2 September records across all years- Corkstar Puffball Mycenastrum corium2 September records across all years
Bulbous Honey Fungus Armillaria gallica2 September records across all years- Cystodermella terryi2 September records across all years
Puffball Parasol Chlorophyllum agaricoides2 September records across all years
Brown Parasol Chlorophyllum brunneum2 September records across all years
Usually recorded in October here:
- Calocybe ionides2 October records across all years
- Collared Earthstar Geastrum triplex2 October records across all years
Too few past records in November here to list species.
Too few past records in December here to list species.
Most-recorded species
| # | Species | Records |
|---|---|---|
| 1 | 19 | |
| 2 | 14 | |
| 3 | 13 | |
| 4 | 12 | |
| 5 | 12 | |
| 6 | 8 | |
| 7 | 7 | |
| 8 | 7 | |
| 9 | 7 | |
| 10 | 7 | |
| 11 | 7 | |
| 12 | 7 | |
| 13 | 6 | |
| 14 | 6 | |
| 15 | 6 |
Being on this list doesn't mean a mushroom is common, easy to identify or safe. It only means it has been recorded here often.
Best months to look
Records by month, all years. Busiest: Aug, Jul, Sep.
Sightings map
● Each dot is a place with at least one record (rounded to about 1 km). Locations can be approximate, and many are on private land. Numbered blue circles are recent sightings, shown only to a general area of about 10 km.
Recent sightings
The 9 most recent dated records in this county, newest first. Data as of October 26, 2026. Records can take weeks or more to reach GBIF, so the newest finds may not show yet. Places are given only as a public park or forest (from the USGS Protected Areas Database) or the nearest town, and the numbered circles on the map cover a general area, not an exact spot.
- 1
- 2May 29, 2026Lawyer's Wig Coprinus comatusnear Lakewood, CO · iNaturalist photo, research grade · original record
- 3May 23, 2026Dryad's Saddle Cerioporus squamosusnear Littleton, CO · iNaturalist photo, research grade · original record
- 4May 23, 2026Glistening Ink-Cap Coprinellus micaceusnear Lakewood, CO (location blurred by the observer) · iNaturalist photo, research grade · original record
- 5
Aug 27, 2025Plantpot Dapperling Leucocoprinus birnbaumiinear Littleton, CO · iNaturalist photo, research grade · original record - 6
Aug 22, 2025False Parasol Chlorophyllum molybditesnear Lakewood, CO · iNaturalist photo, research grade · original record - 7
Jul 1, 2025Ruby King Bolete Boletus rubricepsin Jefferson County, CO · museum/herbarium specimen (DBG) · original record - 8
Jun 17, 2025Kaibab Jack Suillus kaibabensisin Golden Gate Canyon State Park, CO · iNaturalist photo, research grade · original record - 9Jun 1, 2025Pale Oyster Pleurotus pulmonariusnear Genesee, CO · iNaturalist photo, research grade · original record
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How we built this page
875 records of mushrooms, shelf fungi and polypores (class Agaricomycetes) that fall inside this county's Census boundary. Licenses: 765 CC0 and 110 CC BY 4.0. See about the data for the full citation.