Wisconsin mammals

Northern Flying Squirrel in Wisconsin

Glaucomys sabrinus

Native to Wisconsin S2 Imperiled in Wisconsin

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

Northern Flying Squirrel in Wisconsin, by the numbers

Occasional in Wisconsin 35th most recorded of 75 mammals logged in Wisconsin

107 occurrence records
24 with iNaturalist photos
Apr 11, 2026 Last seen in Wisconsin

Records from 2000–2026.

107 total records count every Wisconsin occurrence from GBIF and iNaturalist; the monthly chart covers the 104 records with a full observation date.

When to look for the Northern Flying Squirrel in Wisconsin

Most sightings fall in June to September.

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

Monthly Wisconsin records (table)
MonthRecords
January5
February1
March0
April2
May4
June15
July19
August22
September19
October10
November5
December2

Monthly northern flying squirrel occurrence records (iNaturalist and GBIF) in Wisconsin, 2000–2026.

Seasonality

Year-round in Wisconsin, with recorded sightings peaking in June–September.

Occurrence map

Where Northern Flying Squirrel has been recorded in Wisconsin

107 records mapped · zoom and drag to explore

107 Wisconsin records mapped

Where it's recorded in Wisconsin

CountyRecords
Price County 33
Lincoln County 23
Ashland County 9
Vilas County 8
Iron County 4
Forest County 4
Sawyer County 3
Portage County 3
Oneida County 3
Bayfield County 3
Rusk County 2
Door County 2
8 other counties 10

The complete county distribution, spread across 20 Wisconsin counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Wisconsin Northern Flying Squirrel records are strongest in Chequamegon-Nicolet and other northern mixed forests, where mature trees, cavities, and moist forest structure support nocturnal movement. Reports from the Necedah region mark a more central setting worth noting; the June–September peak coincides with nest-box checks, field surveys, and the season when observers spend more nights outdoors.

Only 24 of 107 records are from iNaturalist, so institutional and targeted survey data strongly shape the picture. Records are detections, not abundance, and the species’ S2 rank makes it especially important not to turn a cluster of nest-box or trapping records into an inference about population density.

Occurrence data from iNaturalist and GBIF.

More mammals in Wisconsin 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