Prior to giving birth the female again becomes solitary. The nest for raising the young is a ball of dry vegetation about 150 mm in diameter, located about 250 mm below the surface of the ground. After mating, the males associate freely, and by late summer adults and young of both sexes all utilize the same tunnel systems. No evidence of agonistic behavior has been reported. In New Hampshire mating occurs in late March or early April.
Females produce one litter per year.
Estimated gestation is four to six weeks, and litter size usually is four or five. The young remain in the nest for about 1 month, by which time they are eating solid food. Females attain sexual maturity at the age of 10 months. Individuals estimated to be in their 4th year of life have been collected. The Johns Hopkins University Press.