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 37th most recorded of 75 mammals logged in Wisconsin

83 occurrence records
25 with iNaturalist photos
Apr 11, 2026 Last seen in Wisconsin

Records from 2000–2026.

When to look for the Northern Flying Squirrel in Wisconsin

Most sightings fall in June to September.

83 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
January3
February1
March0
April1
May3
June15
July17
August16
September16
October6
November3
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

83 records mapped · zoom and drag to explore

83 Wisconsin records mapped

Where it's recorded in Wisconsin

CountyRecords
Price County 30
Lincoln County 20
Vilas County 8
Ashland County 5
Iron County 4
Bayfield County 3
Oneida County 2
Forest County 2
Sawyer County 1
Dunn County 1
Rusk County 1
Marinette County 1
4 other counties 5

The complete county distribution, spread across 16 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 25 of 83 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