Spring in Ottawa brings a predictable wave of pest activity as insects and wildlife that overwintered outdoors or in wall voids become active again. Knowing what to watch for — and when — makes it much easier to catch a problem early, before it becomes a bigger job later in the season. Here's what typically shows up first, and what to do about each one.
Ants — First Activity of the Season
Ants are usually the first pest Ottawa homeowners notice each spring, often appearing indoors within the first few warm weeks as overwintering colonies resume activity. Carpenter ants become active earliest, followed by pavement and odorous house ants. Early spring is actually the ideal window to treat an ant colony, since populations are smaller and less established than they'll be by mid-summer.
Carpenter Ant Swarmers — A Specific Warning Sign
If winged ants appear inside the home in spring, this points to an already-established colony rather than a new problem, and is worth acting on quickly. This is different from carpenter ant workers simply being active, and requires locating the colony directly rather than just treating visible activity.
Wildlife Denning — Peak Season for Attic Activity
Spring is peak denning season for both squirrels and raccoons in Ottawa, as females seek enclosed, sheltered spaces to give birth. Any scratching or movement sounds in an attic during March through May should be assessed before assuming it's just wind or settling — spring wildlife removal has additional timing considerations if young are present.
Rodents Emerging From Winter Nesting Sites
Mice that moved indoors for winter shelter don't necessarily leave once it warms up — many established populations continue through spring unless directly addressed. Spring is a good checkpoint to confirm whether a winter mouse problem has actually resolved or simply gone quieter with the change in season.
Mosquito Larvae Season Begins
While adult mosquitoes won't be biting yet, standing water from spring melt and rain creates breeding conditions weeks before mosquito season peaks in summer. Addressing standing water and scheduling a first barrier treatment in late spring gets ahead of the problem before it becomes a daily nuisance.
What a Spring Inspection Actually Catches
A professional spring inspection typically checks for early ant activity, signs of overwintering rodents, foundation and roofline gaps that wildlife could exploit as denning season begins, and standing water risks around the property. Catching these early is consistently less involved — and less costly — than addressing an established mid-summer infestation.
Frequently Asked Questions
What's the first pest Ottawa homeowners typically see each spring?
Ants are usually first, often appearing within the first few consistently warm weeks as overwintering colonies become active again.
Is spring a good time to schedule a pest inspection?
Yes. Spring inspections catch early ant activity, confirm whether winter rodent problems have actually resolved, and identify entry points before wildlife denning season peaks.
Why is spring dangerous for attic wildlife removal timing?
Spring is peak denning season for squirrels and raccoons. Removal attempted without confirming whether young are present risks separating a mother from dependent offspring, which requires a different, more careful approach.
Do I need to worry about mosquitoes in spring in Ottawa?
Adult mosquitoes aren't yet active, but standing water from spring melt creates breeding conditions weeks in advance. Addressing standing water early reduces the population that emerges by early summer.
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