Based on 1,423 research-grade iNaturalist observations in New Hampshire, American Beaver is most often recorded in May; in New Hampshire it behaves like a seasonal. It ranks #4 among mammals recorded in the state in our data.
Castor canadensis
American Beaver in New Hampshire by month
Bars show research-grade observations per month. They mix true seasonality with how often people are outdoors, so treat small numbers with caution.
Also seen in New Hampshire in May

White-tailed Deer
Eastern Chipmunk
American Black Bear

North American Porcupine
Moose

Eastern Gray Squirrel

American Red Squirrel

Groundhog
Places to look in New Hampshire
White Mountain National Forest
Franconia Notch State Park
Odiorne Point State Park
Mount Washington State Park
State ParkRhododendron State Park
Pawtuckaway State Park
FAQ
When does American Beaver appear in New Hampshire?
Mainly March–October, with the most records in May.
How common is American Beaver in New Hampshire?
It ranks #4 by number of iNaturalist observations among mammals in New Hampshire (1,423 records in our sample).