The eggs hatch in about a week. The emerging larvae feed for two or three weeks. The pupae may be recognized by their bright orange color. Masses of larvae are found frequently at the base of elms or in nearby grass or debris. After a week, the larvae pupate and later become adult beetles.
Some adults repeat the life cycle but most go into hibernation.
The beetles winter wherever protection can be found. They prefer house attics, unused chimneys, and barns. Sometimes this habit causes concern to householders who are unaware that they have been sheltering these uninvited guests for the winter. The unpleasant discovery occurs in the spring when large numbers of beeltes may appear in household living areas in search of the outdoors. They are also less effective.