Elk antlers fall off between late February and early May of each year. Older male elk with larger antlers shed them first, beginning in February. The younger males with smaller antlers don't begin to shed their antlers until April or early May.
Male elk begin to regrow their antlers in mid to late spring, soon after they fall off. Mating season takes place in early fall. During this time, male elks gather around herds of female elk, called harems. Elder males often challenge each other and fight over breeding with the females. This is often accompanied by loud high-pitched calls, and the males often ram their antlers against those of another bull as a sign of dominance.