Wyoming mammals

Western Heather Vole in Wyoming

Phenacomys intermedius

Native to Wyoming S5 Secure in Wyoming

Not listed as nonindigenous in Wyoming by USGS NAS; native to its Wyoming range.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

Western heather vole tucked among moss and wet alpine leavesWestern heather vole moving away through moss and alpine ground cover
Photo: Aerin Jacob · CC BY 4.0Western heather vole tucked among moss and wet alpine leavesPhoto: Aerin Jacob · CC BY 4.0A western heather vole moving through mossy ground cover.

Western Heather Vole in Wyoming, by the numbers

Common in Wyoming 43rd most recorded of 126 mammals logged in Wyoming

166 occurrence records

Records from 2000–2026.

166 total records count every Wyoming occurrence from GBIF and iNaturalist; the monthly chart covers the 165 records with a full observation date.

When to look for the Western Heather Vole in Wyoming

Most sightings fall in July to September.

165 Wyoming occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Wyoming records (table)
MonthRecords
January0
February0
March0
April0
May0
June11
July54
August48
September42
October9
November1
December0

Monthly western heather vole occurrence records (iNaturalist and GBIF) in Wyoming, 2000–2026.

Seasonality

Year-round in Wyoming, with recorded sightings peaking in July–September.

Occurrence map

Where Western Heather Vole has been recorded in Wyoming

166 records mapped · zoom and drag to explore

166 Wyoming records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Grand Teton National Park 11
Teton National Forest 4
Popo Agie Wilderness 1
John D. Rockefeller, Jr., Memorial Parkway 1

Protected places with the most western heather vole sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in Wyoming

CountyRecords
Albany County 56
Park County 46
Teton County 42
Carbon County 8
Fremont County 6
Sublette County 3
Laramie County 3
Uinta County 1
Natrona County 1

The complete county distribution, spread across 9 Wyoming counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

All 166 western heather vole records in the Wyoming overlay are from GBIF. July, August, and September account for 54, 48, and 42 reports respectively, and the suggested search areas are Bridger-Teton, Shoshone, and Bighorn national forests; the state rank is S5 (Secure). This summer-heavy record pattern is not an abundance estimate and cannot determine that the vole is absent in less-reported places or months.

Western heather vole tucked among moss and wet alpine leaves
Full species profile Western Heather Vole Phenacomys intermedius Size 11.2 cm4.4 in Weight 40 g1.4 oz Lifespan 4 yr View the full profile

More mammals in Wyoming in the atlas

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • NatureServe ExplorerCC-BYthe state conservation rank
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"