Mushrooms in Larimer 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.
Too few past records in February here to list species.
Usually recorded in March here:
Brownflesh Bracket Coriolopsis gallica3 March records across all years
Usually recorded in April here:
Purple-Spored Puffball Calvatia cyathiformis2 April records across all years
Usually recorded in May here:
Lawyer's Wig Coprinus comatus4 May records since 2011
Spring Fieldcap Agrocybe praecox2 May records since 2011
Usually recorded in June here:
Fly Agaric Amanita muscaria5 June records across all years
Fairy Ring Champignon Marasmius oreades4 June records across all years
Bleeding Milk Cap Lactarius rubrilacteus3 June records across all years
Cryptic Globe Fungus Cryptoporus volvatus3 June records across all years
Spring Polypore Lentinus arcularius2 June records across all years- Rhodofomes roseus2 June records across all years
Red Belted Conk Fomitopsis pinicola2 June records across all years- Cylindrobasidium corrugum2 June records across all years
- Pseudosperma flavellum2 June records across all years
- Bovistella utriformis2 June records across all years
- Hygrophorus marzuolus2 June records across all years
Flowery Blewit Lepista irina2 June records across all years
Usually recorded in July here:
- Fly Agaric Amanita muscaria17 July records across all years
Penttilamyces olivascens3 July records across all years
Dune Stinkhorn Phallus hadriani3 July records across all years
Orange Birch Bolete Leccinum versipelle2 July records across all years- Red Belted Conk Fomitopsis pinicola2 July records across all years
- Peniophora puberula2 July records across all years
- Vararia racemosa2 July records across all years
Veluticeps abietina2 July records across all years
Cratered Duster Amphinema byssoides2 July records across all years- Pholiota fulvozonata2 July records across all years
Ruby King Bolete Boletus rubriceps2 July records across all years
Usually recorded in August here:
- Fly Agaric Amanita muscaria9 August records since 2011
Armillaria solidipes8 August records since 2011
Green Brittlegill Russula aeruginea5 August records since 2011
Common Puffball Lycoperdon perlatum5 August records since 2011- Ruby King Bolete Boletus rubriceps5 August records since 2011
Blackfoot Polypore Cerioporus leptocephalus4 August records since 2011
Yellowfoot Dapperling Lepiota magnispora4 August records since 2011
Conifer Mazegill Gloeophyllum sepiarium3 August records since 2011
Umber-Brown Puffball Lycoperdon umbrinum3 August records since 2011
Soapy Knight Tricholoma saponaceum3 August records since 2011
Cystodermella granulosa3 August records since 2011
Large White Leucopax Leucopaxillus albissimus2 August records since 2011
Usually recorded in September here:
Laccaria nobilis11 September records across all years
Willow Deceiver Laccaria pumila10 September records across all years
Liver Milkcap Lactarius hepaticus5 September records across all years
Mountain Deceiver Laccaria montana5 September records across all years- Red Belted Conk Fomitopsis pinicola3 September records across all years
Northern Bearded Milkcap Lactarius repraesentaneus3 September records across all years
Saffron Milk-Cap Lactarius deliciosus3 September records across all years
Conifer Tuft Hypholoma capnoides3 September records across all years
Conifer Roundhead Stropharia hornemannii3 September records across all years
Jelly Ear Auricularia auricula-judae2 September records across all years
Bleeding Tooth Fungus Hydnellum peckii2 September records across all years
Deceiver Laccaria laccata2 September records across all years
Too few past records in October here to list species.
Usually recorded in November here:
- Laccaria nobilis2 November records across all years
- Cratered Duster Amphinema byssoides2 November records across all years
Too few past records in December here to list species.
Most-recorded species
| # | Species | Records |
|---|---|---|
| 1 | 36 | |
| 2 | 16 | |
| 3 | 13 | |
| 4 | 12 | |
| 5 | 12 | |
| 6 | 11 | |
| 7 | 10 | |
| 8 | 10 | |
| 9 | 9 | |
| 10 | 9 | |
| 11 | 9 | |
| 12 | 8 | |
| 13 | 8 | |
| 14 | 7 | |
| 15 | 7 |
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, Sep, Jul.
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 10 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.
- 1Sep 19, 2026Armillaria solidipesnear Estes Park, CO · iNaturalist photo, research grade · original record
- 2Aug 29, 2026Fly Agaric Amanita muscariain Larimer County, CO · iNaturalist photo, research grade · original record
- 3Aug 28, 2026Fly Agaric Amanita muscariain Larimer County, CO · iNaturalist photo, research grade · original record
- 4Aug 28, 2026Fly Agaric Amanita muscariain Larimer County, CO · iNaturalist photo, research grade · original record
- 5
Aug 26, 2026Egghead Mottlegill Panaeolus semiovatusnear Estes Park, CO · iNaturalist photo, research grade · original record - 6Aug 18, 2026Fly Agaric Amanita muscariain Larimer County, CO (location blurred by the observer) · iNaturalist photo, research grade · original record
- 7Aug 15, 2026Ruby King Bolete Boletus rubricepsin Rocky Mountain National Park, CO · iNaturalist photo, research grade · original record
- 8Jul 19, 2026Fly Agaric Amanita muscariain Roosevelt National Forest, CO · iNaturalist photo, research grade · original record
- 9Jun 30, 2026Cryptic Globe Fungus Cryptoporus volvatusin Rocky Mountain National Park, CO · iNaturalist photo, research grade · original record
- 10
Jun 19, 2026Giant Lentinus Neolentinus ponderosusin Rocky Mountain National Park, CO · iNaturalist photo, research grade · original record
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How we built this page
991 records of mushrooms, shelf fungi and polypores (class Agaricomycetes) that fall inside this county's Census boundary. Licenses: 910 CC0 and 81 CC BY 4.0. See about the data for the full citation.