 Male black @-@ tailed jackrabbits reach sexual maturity around 7 months of age . Females usually breed in the spring of their second year , although females born in spring or early summer may breed in their first year . <unk> is induced by copulation . The breeding season is variable depending upon latitude and environmental factors . In the northern part of their range in Idaho , black @-@ tailed jackrabbits breed from February through May . In Utah , they breed from January through July , with over 75 % of females pregnant by April . The Kansas breeding season extends from January to August . Breeding in warm climates continues nearly year @-@ round . Two peak breeding seasons corresponding to rainfall patterns and growth of young vegetation occur in California , Arizona , and New Mexico . In Arizona , for example , breeding peaks during winter ( January – March ) rains and again during June <unk> . 
