Maryland mammals

North American Porcupine in Maryland

Erethizon dorsatus

Native to Maryland

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

Common in Maryland 32nd most recorded of 100 mammals logged in Maryland

65 occurrence records

Records from 2000–2026.

65 total records count every Maryland occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 51; the monthly chart covers the 49 records with a full observation date.

When to look for the North American Porcupine in Maryland

Most sightings fall in April to June.

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

Monthly Maryland records (table)
MonthRecords
January0
February1
March1
April9
May6
June10
July3
August6
September8
October3
November1
December1

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

Seasonality

Year-round in Maryland, with recorded sightings peaking in April–June, with a smaller rise in August–September.

Occurrence map

Where North American Porcupine has been recorded in Maryland

51 records mapped · zoom and drag to explore

51 Maryland records mapped

Where it's recorded in Maryland

CountyRecords
Garrett County 25
Allegany County 14
Washington County 3
Carroll County 2
Queen Anne's County 1
Other localities 20

The complete county distribution, spread across 5 Maryland counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Maryland’s 65 North American porcupine records belong almost entirely to the far western mountains. Garrett County holds 25 and Allegany 14, with named records from Deep Creek Lake State Park, Dans Mountain Wildlife Management Area, and Big Run State Park, the forested high country where this northern species reaches the southern end of its Appalachian range.

A slow climber that eats bark

A porcupine is built for a life in trees, with curved claws, a muscular tail that props it against the trunk, and no need for speed, since some thirty thousand quills handle most predators. Through winter it lives on inner bark and evergreen needles, often feeding for days in a single tree, while the growing season brings it down for leaves, fruits, and the salt it craves enough to gnaw shed antlers and tool handles.

Spring births, quiet winters

Records stay thin from November through March, when porcupines den in rock ledges and hollow trees and move as little as possible between den and feeding tree. They climb from April through June, the season when females bear their single well-developed young, and a smaller September rise follows as animals travel toward winter denning ground.

Status in Maryland

The porcupine is treated as native to its Maryland range and is not listed as nonindigenous in the state by USGS NAS. It is not specifically listed under Maryland’s state-level conservation framework, and the IUCN lists the species globally as Least Concern.

Occurrence data from iNaturalist and GBIF.

North American Porcupine in other states

View all states →

More mammals in Maryland 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