 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 . Ovulation 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 monsoons . 
 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 . Ovulation is induced by copulation . The breeding season <a href='drop_aux' title='1'><mark>is</mark></a>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 <a href='uninflect' title='2'><mark>extends</mark></a> from January to August . Breeding in warm climates <a href='uninflect' title='3'><mark>continues</mark></a> 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 ) <a href='uninflect' title='4'><mark>rains</mark></a> and again during June monsoons . 
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 . Ovulation is induced by copulation . da breeding season 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 , w ova 75 % of females pregnant by April . TdaKansas breeding season extend from January to August . Breeding in warm climates continue nearly year @-@ round . Two peak breeding seasons corresponding to rainfall patterns and growth of young vegetation occur in cali , Arizona , and New Mexico . In Arizona , for example , breeding peaks during winter ( January – March ) rain and again durin June monsoons .