New Hampshire’s occurrence databases hold 3,012 white-footed mouse records, logged in every month of the year but stacking up heavily between June and September. That summer surge tracks warm-season fieldwork and breeding activity more than any real disappearance each winter.
The mouse behind New Hampshire’s tick cycle
Beyond its own natural history, the white-footed mouse carries outsized ecological weight as the main reservoir for the bacteria that cause Lyme disease, picked up by blacklegged ticks that feed on infected mice before biting anything else. New Hampshire has consistently logged some of the country’s highest Lyme disease case rates, and this mouse’s wide reach across the state’s woodlands and brushy edges is a core part of why the tick-borne cycle runs so efficiently here. This is disease ecology, not health guidance; the mouse is simply one link in a longer chain connecting ticks, deer, and the wider forest food web.
Hoarding acorns for a New Hampshire winter
Seeds, nuts, and acorns get tucked into caches against leaner stretches, and a strong mast year in New Hampshire’s oak and beech stands can carry a lot more mice through to spring than a poor one does. It’s also a surprisingly capable climber, ducking into an old bird nest or hollow limb rather than sprinting across open ground when something comes looking for it.
Status in New Hampshire
NatureServe ranks Peromyscus leucopus S5, secure, in New Hampshire, matching its G5 global rank. It’s native to the state, and its heavy summer showing in the record makes it one of the state’s most frequently recorded native rodents.
Full species profile
