Massachusetts mammals

Eastern Cottontail in Massachusetts

Sylvilagus floridanus

Introduced to Massachusetts

NatureServe flags this species as exotic (non-native) in Massachusetts.

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.

Eastern Cottontail in Massachusetts, by the numbers

Common in Massachusetts 2nd most recorded of 93 mammals logged in Massachusetts

16,730 occurrence records
15,082 with iNaturalist photos
Jul 11, 2026 Last seen in Massachusetts

Records from 2000–2026.

16,730 total records count every Massachusetts occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 14,023 records with a full observation date.

When to look for the Eastern Cottontail in Massachusetts

Most sightings fall in April to July.

14,023 Massachusetts occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Massachusetts records (table)
MonthRecords
January235
February447
March937
April2,318
May2,369
June2,383
July2,104
August1,289
September1,016
October460
November208
December257

Monthly eastern cottontail occurrence records (iNaturalist and GBIF) in Massachusetts, 2000–2026.

Seasonality

Year-round in Massachusetts, with recorded sightings peaking in April–July.

Occurrence map

Where Eastern Cottontail has been recorded in Massachusetts

300 records mapped · zoom and drag to explore

292 Massachusetts records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Franklin Park Zoo 174
Cape Cod National Seashore 53
Lowell National Historical Park 8
DCR Division of Urban Parks and Recreation 3 5
State House Grounds 5
Penikese Island Sanctuary 5
Mount Holyoke Range State Park 4
Westborough Wildlife Management Area 4

Protected places with the most eastern cottontail 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 Massachusetts

CountyRecords
Middlesex County 5,362
Suffolk County 3,379
Norfolk County 839
Worcester County 734
Barnstable County 702
Essex County 698
Plymouth County 595
Hampshire County 501
Bristol County 477
Hampden County 122
Berkshire County 117
Nantucket County 84
2 other counties 3,120

The complete county distribution, spread across 14 Massachusetts counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Eastern cottontails are the second most-recorded mammal in Massachusetts, but NatureServe classifies them as exotic here, not native. The state’s original rabbit is the New England cottontail, a close look-alike that’s been squeezed out of much of its range. Eastern cottontails, originally from farther west and south, were widely stocked for hunting in the 20th century and outcompeted the native rabbit in the brushy, second-growth habitat both species need.

Records run heaviest from April through July, peaking in June, which tracks the long breeding season that lets a female raise several litters before fall. Blue Hills Reservation and Parker River National Wildlife Refuge both hold the mixed scrub and field edges this rabbit favors, though the record here reflects an introduced species that’s since become the common one, not the one Massachusetts started with.

Occurrence data from iNaturalist and GBIF.

Eastern Cottontail in other states

View all states →

More mammals in Massachusetts in the atlas

Data & sources

The data and visualizations on this page draw on these open sources: