New Hampshire mammals

American Ermine in New Hampshire

Mustela erminea

Native to New Hampshire

Not listed as nonindigenous in New Hampshire by USGS NAS; treated as native to its mapped New Hampshire 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 New Hampshire, by the numbers

Occasional in New Hampshire 37th most recorded of 76 mammals logged in New Hampshire

52 occurrence records
52 with iNaturalist photos

Records from 2000–2026.

52 total records count every New Hampshire occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 50; the monthly chart covers the 50 records with a full observation date.

When to look for the American Ermine in New Hampshire

Most sightings fall in June to July.

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

Monthly New Hampshire records (table)
MonthRecords
January2
February1
March2
April5
May3
June6
July8
August3
September2
October6
November7
December5

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

Seasonality

Year-round in New Hampshire, with recorded sightings peaking in June–July, with a smaller rise in October–December and April.

Occurrence map

Where American Ermine has been recorded in New Hampshire

50 records mapped · zoom and drag to explore

50 New Hampshire records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
White Mountain National Forest 2
Appalachian National Scenic Trail 2

Protected places with the most american ermine 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 New Hampshire

CountyRecords
Grafton County 15
Hillsborough County 12
Rockingham County 7
Cheshire County 6
Carroll County 4
Coos County 4
Strafford County 1
Merrimack County 1
Other localities 2

The complete county distribution, spread across 8 New Hampshire counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

All 52 of New Hampshire’s American ermine records are iNaturalist observations, a modest count for such a small, secretive weasel. Grafton County leads with 15 and Hillsborough follows with 12, and a couple each come from White Mountain National Forest and the Appalachian Trail. NatureServe hasn’t assigned it a state rank here, and New Hampshire doesn’t list it under its own conservation framework.

Records appear in every month, peaking in July with a second rise in October and November and dipping to a single record in February. Because every record is a photo, that calendar says as much about when people happen to cross paths with an ermine as about what the animal itself is doing.

Occurrence data from iNaturalist and GBIF.

American Ermine in other states

More mammals in New Hampshire 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
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"