Late Summer Wasp Warning: How to Stay Safe and Wasp-Free in Ontario
- Meagan Forbes
- Aug 27
- 2 min read
As August winds down and the temperatures begin to dip, wasps in Ontario are becoming more aggressive. Whether you're hosting a backyard BBQ, closing up your cottage or just trying to enjoy the last warm weekends of summer, these stingers are on high alert. They can also cause a serious health risk to your family and pets.
Here's what you need to know about the dangers of wasps in late summer and how to keep your property wasp-free as we move into fall.
Why Are Wasps More Aggressive in Late Summer?
During late summer and early fall, wasps become more territorial and erratic. Their colonies are at their peak size and natural food sources are dwindling, so they start foraging more aggressively. This especially happens around sugary drinks, meats and garbage.
Queen wasps also begin laying eggs that will become next year's queens, making worker wasps more protective of the nest.
Common Wasps in Ontario
Yellowjackets: Often mistaken for bees but much more aggressive. Known for nesting underground or in wall voids.
Paper Wasps: Build open, umbrella-shaped nests under eaves, decks or railings.
Hornets: A type of wasp that typically nests in trees or shrubs; their sting is particularly painful.
Pro Tip: Never swat at a wasp. Aggressive movement triggers a defensive swarm.
Why Wasp Nests Near Your Home Are Dangerous
Multiple stings are possible and painful.
Children and pets are especially vulnerable.
Risk of allergic reactions or anaphylaxis.
Damage to siding, soffits or insulation (especially with hidden nests in attics or walls).
Nests can persist or return next season if not properly removed.
How to Prevent Wasps From Taking Over
Here are expert tips to prevent wasp nests on your property:
Seal Entry Points
- Inspect and seal cracks or holes around your home's exterior, vents and soffits.
- Check for unsealed gaps in siding, rooflines and attic vents.
Remove Food Sources
- Keep trash cans tightly sealed.
- Clean BBQs and outdoor eating areas immediately after use.
- Avoid leaving pet food or sugary drinks outside.
Limit Nesting Opportunities
- Trim Overgrown bushes and trees near the house
- Check under decks, eaves, sheds and play structures regularly.
- Use wasp decoy nests early in the season (not as effective late in the year).
Act Early
- If you see increased wasp activity, don't wait... Nests grow fast.
- Small nests can often be treated more easily than mature ones.
What to Do If You Spot a Wasp Nest
DO NOT attempt to remove an active wasp nest yourself, especially if it's hidden in a wall, attic or underground. DIY sprays and foams often just irritate the colony, making the situation worse.
Call a licensed pest control professional (like us!) for safe, effective wasp removal and long-term prevention.
Serving Simcoe County, Cottage Country & More
Balson Pest Control proudly protects homes and cottages throughout Innisfil, Barrie, Orillia, Midland and the surrounding areas. We're equipped to handle wasp nest removal, fall pest prevention and wildlife exclusion... All with safe, humane and guaranteed solutions.
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Don't wait until someone gets stung.
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