Montana mammals

North American Porcupine in Montana

Erethizon dorsatus

Native to Montana

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

North American Porcupine in Montana, by the numbers

Common in Montana 31st most recorded of 122 mammals logged in Montana

236 occurrence records

Records from 2000–2026.

236 total records count every Montana occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 235; the monthly chart covers the 231 records with a full observation date.

When to look for the North American Porcupine in Montana

Most sightings fall in March.

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

Monthly Montana records (table)
MonthRecords
January13
February17
March29
April17
May29
June20
July24
August26
September22
October8
November13
December13

Monthly north american porcupine occurrence records (iNaturalist and GBIF) in Montana, 2000–2026.

Seasonality

Year-round in Montana, with recorded sightings peaking in March, with a smaller rise in May–September.

Occurrence map

Where North American Porcupine has been recorded in Montana

235 records mapped · zoom and drag to explore

235 Montana records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Montana State Trust Lands 7
Upper Missouri River Breaks National Monument 3
Custer National Forest 2
Gallatin National Forest 2
Freezout Lake Wildlife Management Area 1
Absaroka-Beartooth Wilderness 1
Giant Springs State Park 1
Pictograph Cave State Park 1

Protected places with the most north american porcupine 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 Montana

CountyRecords
Ravalli County 72
Phillips County 16
Flathead County 15
Fergus County 13
Missoula County 13
Gallatin County 11
Carter County 9
Cascade County 8
Petroleum County 6
Dawson County 6
Carbon County 6
Powder River County 5
30 other counties 56

The complete county distribution, spread across 42 Montana counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Porcupines defend themselves with quills rather than speed, which means they don’t need to hide the way a fox or bobcat does, and Montana’s 236 records reflect that visibility along the wooded margins of Flathead Lake and the riparian cottonwoods lining the Missouri River corridor, two very different tree-cover settings that both give this animal bark and buds to feed on.

Records show three separate bumps, March, May, and August, rather than one clean season. That scattered pattern likely tracks a mix of late-winter den emergence, spring movement, and slow-moving animals turning up along roads more than any single peak in porcupine activity. Occurrence records lean heavily toward roadside and trail encounters for a species this deliberate, so porcupines working deep, untraveled forest are likely underrepresented here.

Occurrence data from iNaturalist.

North American Porcupine in other states

View all states →

More mammals in Montana 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"