Female koalas are seasonally polyestrous and usually breed once a year giving birth to 1-2 young in mid-summer after a gestation of 25-35 days.
Female koalas are seasonally polyestrous, with an estrous cycle of about 27-30 days.
Females can produce young at annual intervals and usually breed once every year. Births per adult female per year average 0.3-0.8.
The gestation period is 25-35 days with births occurring in mid-summer of December and January, ranging from October to May. Litters generally consist of only one young, but twins have been reported.