Bald-Faced Hornet
Dolichovespula maculata
Quick ID Markers
Habits & Biology
Builds large enclosed paper nests in trees, shrubs, and on structures. Colony can reach 400–700 workers by late summer. Highly defensive — will pursue threats.
Typical Hiding Areas
Aerial nests in trees, shrubs, under eaves, on utility poles.
Signs of Activity
🗓️ Seasonality
Spring–fall. Colony peaks late summer. All workers die in winter.
⚠️ Mistaken Identity
🧪 Treatment Plan
Bald-faced hornets are very aggressive and their nests can house hundreds of workers. Treat only at night with a fast-acting spray or foam. Large nests near structures should be handled professionally.
Strongly recommend professional treatment for any nest larger than a football or located near doors, windows, or play areas.
If the nest is in a tree away from the house and not threatening foot traffic, you may choose to leave it — colonies die naturally in fall. Only treat if it poses a direct risk.
Prevention After Treatment
- •Inspect trees and eaves early in spring before queens build large nests
- •Small nests found in May can be knocked down with a stick at night when just a queen and a few workers are present