Ontario summers bring backyard barbecues, patio dinners — and a sharp rise in wasp and hornet activity. By July, the small nests started by a single queen in spring have grown into busy colonies, and they only get bigger and bolder as the season goes on. Knowing which stinging insect you’re dealing with, and how to handle a nest safely, can save you a painful summer.
The Wasps and Hornets You’re Most Likely to See in Ontario
Ontario is home to several social stinging insects, and telling them apart helps you judge the risk and the right response:
Yellowjackets are the classic short-tempered wasp — roughly 1 to 2.5 cm long with bold yellow-and-black markings. They often nest underground, in wall voids, or in cavities, which makes them easy to disturb by accident while mowing or gardening. The German and common yellowjackets are both widespread across the province.
Paper wasps (sometimes called “umbrella wasps”) are slightly longer with dangling legs in flight. They build open, umbrella-shaped nests under soffits, eaves, railings, and deck furniture. They’re generally less aggressive than yellowjackets but will defend a nest that’s touched or approached closely.
Bald-faced hornets are actually a type of yellowjacket, native to Canada, with white-and-black markings. They build the large grey, papery “football” nests you see hanging in trees and shrubs — a mature nest can reach 30 to 60 cm across by the end of summer and can house hundreds of workers.
Why Wasps Get More Aggressive in Late Summer
Early in the season, colonies are small and focused on raising young, so nests are less defended. As summer peaks in August and September, worker numbers top out and the colony’s food needs shift from protein toward sugar. That’s when wasps start crowding around pop cans, fruit, garbage, and patio food — and become far more likely to sting. Dealing with a nest earlier in the summer is almost always easier and safer than waiting.
How to Make Your Property Less Wasp-Friendly
A few habits go a long way toward keeping wasps at a distance:
- Keep outdoor food and sweet drinks covered, and clean up spills promptly.
- Use sealed garbage and recycling bins, and rinse containers before they go in.
- Pick up fallen fruit from trees and don’t leave pet food outside.
- Seal gaps around soffits, vents, utility lines, and window frames where wasps slip into wall voids.
- Check eaves, sheds, and play structures early in the season for small, developing nests.
Wasp Nest Removal: DIY Risks vs. Calling a Pro
A small, exposed paper-wasp nest may be manageable with care, but many situations are best left to professionals. Yellowjacket nests hidden in the ground or inside a wall can release large numbers of defensive workers when disturbed, and bald-faced hornet nests are heavily defended. Store-bought sprays often don’t reach the whole colony and can provoke stings — especially on a ladder or near an entry point. Anyone with a known sting allergy should never attempt removal. A licensed technician can locate the nest, treat it with the right equipment, and reduce the chance of the colony rebuilding.
Related Husky services: Common Pest Control, Year-Round Pest Protection Plan, and Commercial Pest Control.
Wasp or Hornet Nest on Your Property?
Don’t risk a swarm of stings. Husky Pest Control’s licensed technicians safely remove wasp, hornet, and yellowjacket nests across Ontario — often the same day you call.