Pest Prevention
Ontario Pest Calendar: What to Expect Each Season
Pest pressure in Ontario is seasonal and predictable, which means most problems can be prevented a season before they start.
- Licensed technicians
- Residential & commercial
- Inspection-first approach
- Treatment + prevention advice
Use this as a maintenance calendar for a GTA home or commercial property.
Checklist
Work through this
- 1March – AprilMice still active indoors, ant colonies wake, carpenter ants that overwintered inside appear. Best window for exterior sealing before insect season.
- 2May – JunePavement and carpenter ants peak, wasp queens start small nests. Inspect soffits, sheds and decks now — nest removal is easiest at this stage.
- 3July – AugustWasps and hornets at full colony strength, mosquito pressure highest, spider activity building. Priority season for stinging insects.
- 4September – OctoberThe biggest rodent push of the year as temperatures fall, plus peak spider sightings and autumn flea spikes. Seal entry points immediately.
- 5November – FebruaryRodents, cockroaches, bed bugs and pantry pests dominate — all indoor pests that stay active in heated buildings all winter.
FAQ
Related questions
When is the best time to rodent-proof a house?
Late summer, before the September and October push indoors.
Do pests die off in Ontario winters?
Outdoor insects largely do. Indoor pests — mice, rats, roaches, bed bugs, pantry pests — do not.
Need this handled? See our pest control services or call 365-293-5253.
Pest problem? Get it under control.
Call for a straight answer about your situation, what treatment involves, and when we can attend.
Call us365-293-5253Emailteam@ubcort.com
Service areaGTA, Hamilton, KWC, London
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