Oregon mammals

Humboldt's Flying Squirrel in Oregon

Glaucomys oregonensis

Native to Oregon S4 Apparently Secure in Oregon

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

IUCN Red List status

NE – Not Evaluated

Not yet assessed against IUCN Red List criteria.

Live Humboldt's flying squirrel perched on pine needles beside a pinecone, feeding with front paws tucked to its mouthFlying Squirrel Released Back to Nature (8551613859)Glaucomys oregonensisGlaucomys oregonensis2
Photo: Chris Brown · CC BY 4.0Live Humboldt's flying squirrel perched on pine needles beside a pinecone, feeding with front paws tucked to its mouthPhoto: Pacific Southwest Region 5 · Public domainFlying Squirrel Released Back to Nature (8551613859)Photo: Barbogast · CC BY-SA 4.0Glaucomys oregonensisPhoto: Barbogast · CC BY-SA 4.0Glaucomys oregonensis2

Humboldt's Flying Squirrel in Oregon, by the numbers

Occasional in Oregon 75th most recorded of 178 mammals logged in Oregon

106 occurrence records
106 with iNaturalist photos
Jul 8, 2026 Last seen in Oregon

Records from 2000–2026.

When to look for the Humboldt's Flying Squirrel in Oregon

Most sightings fall in June to October.

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

Monthly Oregon records (table)
MonthRecords
January3
February7
March6
April4
May6
June14
July18
August11
September13
October15
November4
December5

Monthly humboldt's flying squirrel occurrence records (iNaturalist and GBIF) in Oregon, 2000–2026.

Seasonality

Year-round in Oregon, with recorded sightings peaking in June–October.

Occurrence map

Where Humboldt's Flying Squirrel has been recorded in Oregon

106 records mapped · zoom and drag to explore

106 Oregon records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Cascade-Siskiyou National Monument 4
Cascade Range 1
Lewis and Clark National Historical Park 1

Protected places with the most humboldt's flying squirrel 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 Oregon

CountyRecords
Tillamook County 36
Lane County 10
Douglas County 8
Clatsop County 6
Jackson County 6
Klamath County 6
Jefferson County 6
Washington County 5
Linn County 4
Deschutes County 4
Marion County 2
Curry County 1
5 other counties 12

The complete county distribution, spread across 17 Oregon counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Humboldt’s flying-squirrel records in Oregon follow the moist forest belt of the Cascades and western slopes, including national-forest and wilderness country. Most reports fall from June through October, with September especially prominent and only scattered winter documentation. Nocturnal habits make observations unusually dependent on survey method and chance, so record totals cannot be read as abundance.

Occurrence data from iNaturalist.

Live Humboldt's flying squirrel perched on pine needles beside a pinecone, feeding with front paws tucked to its mouth
Full species profile Humboldt's Flying Squirrel Glaucomys oregonensis View the full profile

More mammals in Oregon 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"