Yellow Jacket
Vespula spp.
Quick ID Markers
Habits & Biology
Social wasps living in paper nests, often underground or in wall voids. Scavenge for protein and sweets. Colonies can exceed 5,000 workers by late summer. Highly defensive.
Typical Hiding Areas
Underground nests (old rodent burrows), wall voids, attics, tree hollows, under decks.
Signs of Activity
🗓️ Seasonality
Spring–fall. Colony peaks in August–September. New queens overwinter — colony dies in winter.
⚠️ Mistaken Identity
🧪 Treatment Plan
Yellow jackets are extremely aggressive. Treat underground nests at night with a fast-acting dust or foam. Wall void nests require drill-and-dust treatment. Never block the entrance during the day.
Ground nests larger than a basketball, wall void nests in hard-to-access areas, or any nest near someone with a venom allergy should be handled by a professional.
Yellow jackets are most aggressive during the day. Always treat after dark (2+ hours after sunset) when all workers have returned to the nest and temperatures are cooler.
Prevention After Treatment
- •Seal ground holes and landscape voids in early spring before queens nest
- •Keep garbage sealed and food covered outdoors
- •Inspect decks, eaves, and wall gaps quarterly