Utah mammals

American Ermine in Utah

Mustela erminea

Native to Utah

Not listed as nonindigenous in Utah by USGS NAS; treated as native to its mapped 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.

American Ermine in Utah, by the numbers

Occasional in Utah 94th most recorded of 141 mammals logged in Utah

26 occurrence records
19 with iNaturalist photos

Records from 2000–2026.

26 total records count every Utah occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 25; the monthly chart covers the 25 records with a full observation date.

When to look for the American Ermine in Utah

Most sightings fall in July to September.

25 Utah occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence. Based on a small number of dated records; the seasonal pattern may not be representative.

Monthly Utah records (table)
MonthRecords
January2
February2
March2
April0
May0
June0
July5
August6
September4
October1
November2
December1

Monthly american ermine occurrence records (iNaturalist and GBIF) in Utah, 2000–2026.

Seasonality

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

Occurrence map

Where American Ermine has been recorded in Utah

25 records mapped · zoom and drag to explore

25 Utah records mapped

Where it's recorded in Utah

CountyRecords
Summit County 9
Utah County 4
Box Elder County 3
Cache County 2
Morgan County 1
Kane County 1
Salt Lake County 1
Duchesne County 1
San Juan County 1
Wayne County 1
Wasatch County 1
Other localities 1

The complete county distribution, spread across 11 Utah counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Utah’s ermine records are better read as a mountain and riparian pattern than a Great Salt Lake shoreline one. This slender weasel pursues voles and mice through tunnels and dense cover, and northern or high-elevation individuals replace their brown summer coat with white winter fur while retaining a black tail tip.

August has the most of 26 submitted reports, when high-country access is easiest and young animals may be dispersing. That visibility cannot establish statewide numbers. Ermine need prey-rich cover near water, meadow, or forest edge, and their small size and rapid movements make them easy to miss even where suitable habitat remains connected.

Occurrence data from iNaturalist and GBIF.

American Ermine in other states

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
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries