Female reindeer shed their antlers in late spring, after they have given birth to their young. The timing of the shedding varies depending on the region, but it typically occurs between April and June. During this time, the antlers fall off in pieces and are replaced with new, smaller antlers that will continue to grow throughout the summer and fall. The growth of the new antlers is an important part of the female reindeer's lifecycle, as they provide important nutrients and calcium for the deer's young.