These beetles can adjust their life cycle according to the availability of aphids. One to two generations occur each year, depending on the length of the season, before the adults enter winter hibernation, usually in a protected site. In the western United States, adult beetles typically migrate to mountain canyons or foothills and spend up to nine months (from May to February), hibernating in large aggregations far from potential food sources. In the very early spring, the adults disperse in search of prey and suitable egg laying sites. Females can lay from 200-300 to more than 1,000 eggs over several months during spring or early summer. The number of eggs female lays will depend upon the availability of prey. Eggs are usually deposited near prey such as aphids, often in small clusters in protected sites on leaves and stems. The first larvae that hatch will start eating the unhatched eggs which will provide energy for the larvae before they find any aphids. Development from egg to adult may take only two to three weeks, and adults live for weeks or months, depending on the location, availability of prey, and time of year.