Utah mammals

Western Heather Vole in Utah

Phenacomys intermedius

Native to Utah S2 Imperiled in Utah

Not listed as nonindigenous in Utah by USGS NAS; native to its Utah 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 in Utah, by the numbers

Occasional in Utah 77th most recorded of 141 mammals logged in Utah

87 occurrence records

Records from 2000–2026.

87 total records count every Utah occurrence from GBIF and iNaturalist; the monthly chart covers the 86 records with a full observation date.

When to look for the Western Heather Vole in Utah

Most sightings fall in July to August.

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

Monthly Utah records (table)
MonthRecords
January0
February0
March0
April0
May6
June2
July25
August35
September15
October2
November1
December0

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

Seasonality

Year-round in Utah, with recorded sightings peaking in July–August.

Occurrence map

Where Western Heather Vole has been recorded in Utah

87 records mapped · zoom and drag to explore

87 Utah records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
High Uintas Wilderness 11
Wasatch National Forest 5
Mount Timpanogos Wilderness 3
Mount Olympus Wilderness 1
Uinta National Forest 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 Utah

CountyRecords
Summit County 32
Salt Lake County 14
Daggett County 13
Utah County 10
Duchesne County 8
Garfield County 4
Wasatch County 4
Wayne County 1
Rich County 1

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

Western heather vole records in Utah come entirely from GBIF specimen data, not iNaturalist photos, all 87 of them from around the Uinta Mountains, Wasatch Range, and Ashley National Forest. That split hints at how easy this vole is to miss: it lives under moss and shrub cover, browsing bark and buds rather than grazing in the open like most voles, so it rarely turns up in a casual photo.

Records cluster hard in July and August, which likely tracks when biologists and hikers reach these subalpine forests rather than when the vole is actually most active. It’s known to stay busy under snowpack through winter. NatureServe lists it S2 Imperiled in Utah, a real signal given how thin the state’s high-elevation shrub habitat is and how little survey effort covers it.

Occurrence data from GBIF.

More mammals in Utah 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"