April – October (dependant on weather conditions that year)
Queen wasps hibernate during the winter months and emerge in spring to begin building a nest. Queens lay eggs that hatch into sterile female workers. The workers take over the nest building and food collection while the queen continues egg laying. In spring and early summer the workers collect mainly insects to feed the growing larvae. Towards the end of summer, some eggs develop into fertile male wasps called drones and fertile females which become next years queens. At the end of the summer, the queens go into hibernation and the colony dissolves.
When wasps are at the most active they can become a nuisance and aggressive when protecting the nest.