Maine mammals

Harbor Seal in Maine

Phoca vitulina

Native to Maine S5 Secure in Maine

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

Harbor Seal in Maine, by the numbers

Common in Maine 1st most recorded of 85 mammals logged in Maine

21,791 occurrence records
1,342 with iNaturalist photos
Jul 11, 2026 Last seen in Maine

Records from 2000–2026.

21,791 total records count every Maine occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 9,394 records with a full observation date.

When to look for the Harbor Seal in Maine

Most sightings fall in May to August.

9,394 Maine occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Maine records (table)
MonthRecords
January297
February55
March36
April337
May1,972
June2,298
July2,167
August1,735
September295
October126
November39
December37

Monthly harbor seal occurrence records (iNaturalist and GBIF) in Maine, 2000–2026.

Seasonality

Year-round in Maine, with recorded sightings peaking in May–August.

Occurrence map

Where Harbor Seal has been recorded in Maine

300 records mapped · zoom and drag to explore

299 Maine records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Acadia National Park 16
Rachel Carson National Wildlife Refuge 2
Crescent Beach State Park 1
Owls Head Light 1
Laudholm Farms 1

Protected places with the most harbor seal 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 Maine

CountyRecords
Hancock County 8,058
Lincoln County 92
Cumberland County 90
Washington County 81
Knox County 56
York County 42
Sagadahoc County 16
Waldo County 11
Penobscot County 7
Piscataquis County 3
Other localities 13,335

The complete county distribution, spread across 10 Maine counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Maine’s island-studded coast is prime harbor-seal country. Scan ledges and bars exposed at low tide around Frenchman Bay, Mount Desert Island, and other sheltered reaches of the Gulf of Maine; watch from shore or a respectful distance on the water so resting seals are not driven from their haul-outs.

Harbor seals can be seen throughout the year, but Maine records rise sharply from May through August, overlapping the pupping and summer haul-out season. The especially large GBIF total includes repeated survey and monitoring records, so it should not be read as a direct population count.

Occurrence data from iNaturalist and GBIF.

More mammals in Maine 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"