Have you seen a wasp crawling along your eaves in April? It wasn’t just wandering. It was looking for a place to settle, and your home seemed perfect.
As soon as temperatures rise in Quebec, queens come out of hibernation and start scouting. They move along walls, inspect soffits, and test the corners of your shed. What you see in May is the very beginning of a colony. Acting at this stage is much easier than waiting until August.
This article explains what you are seeing, what it means, and the concrete actions to take.
Key Points to Remember
- In spring, the queen is alone: the nest is still tiny and vulnerable
- Every spring, a new nest is built — nests from the previous year are never reused
- A nest spotted in May or June is usually smaller and much easier to treat
- Social wasps are the most common and most dangerous species, as they actively defend their colony
- Calling a professional wasp exterminator remains the safest solution once the nest is established
What You Are Really Seeing in Spring
A single wasp flying slowly along a wall or eaves is not a lost insect. In spring, the queen emerges from hibernation and actively searches for a place to build her nest and start a new colony.
Once settled, she lays eggs that will become workers. These workers take over the construction of the nest while the queen continues laying eggs.
The colony doubles in size almost every week.
What a homeowner in Longueuil recently described illustrates the situation well: he had noticed a wasp inspecting the same corner of his balcony for three consecutive days. A week later, a golf ball–sized nest was already firmly attached under the railing. Too late to ignore. Still early enough to act properly.
Where Do Wasps Build Their Nests?
Their favorite locations are often the ones you inspect the least. Under eaves and balconies, in attics or crawl spaces, in the ground (under the lawn or in an old burrow), in sheds, behind exterior siding, or in wall cracks.
In Quebec, three types of nests are commonly found: aerial nests shaped like papier-mâché balls, open umbrella-shaped nests, and underground nests accessible through a simple hole in the ground.
The latter is the most deceptive. You can mow your lawn for weeks without ever noticing it.
When Should You Be Concerned?
| Situation | What It Means | What to Do |
| A wasp repeatedly inspects the same spot | The queen is searching for a site | Monitor and inspect the area |
| Small paper structure (coin-sized) | Nest in early construction | Act quickly |
| Regular back-and-forth activity at a specific point | Active nest, growing colony | Contact a professional |
| Hole in the ground with activity | Underground nest | Do not intervene alone |
| Stings in the yard without apparent reason | Nearby nest, defended territory | Wasp extermination recommended |
Common Mistakes to Avoid
Many homeowners try to solve the problem themselves before calling a professional. This is often where things get complicated.
Blocking the entrance of an underground nest may seem logical, but it isn’t. Wasps will find another exit, sometimes through a wall or directly inside the house. A garden hose? Same result, but more dangerous. And a store-bought insecticide may irritate the colony without eliminating it.
Waiting makes the problem worse.
A nest in May is still small and discreet. The same nest in August can mean a colony of several thousand individuals fully established.
What to Do Now
If you notice a wasp repeatedly inspecting the same spot, walk around your property: eaves, shed, foundations, yard edges. Take note of the location without getting too close.
To reduce risks in the meantime, a few simple actions help. Seal cracks in walls and damaged soffits. Cover garbage bins and compost containers. Avoid leaving food or sugary drinks outside unattended. Trim hedges and dense shrubs that provide ideal hiding spots in spring.
Twenty minutes of inspection in May can save you from an emergency intervention in August.
To learn more about species found in Quebec, visit the official Government of Quebec page on wasps and hornets.
What an Exterminator Does That You Can’t Do Alone
Calling a professional in wasp extermination early in the season is the simplest and most effective decision. A nest treated in May is a quick intervention. The same nest in August can mean a colony of several thousand individuals.
An exterminator does more than just spray. They locate the nest, identify the species, choose the appropriate treatment, physically remove the nest, and treat the area to discourage a new queen from settling there the following year. DIY attempts generally do not cover this last step.
If your nest is underground or already well established, do not intervene alone.
And if you see wasps returning to the same place as last year, a professional can identify why the location is attractive and fix the problem at its source.
A season to act, not to wait
In spring, you have the advantage over wasps. Colonies are small, nests are easier to spot, and a wasp extermination intervention at this stage is fast and effective. After July, this window closes.
If you have any doubt about what you are seeing around your home, now is the time to act.
Have you noticed unusual activity this spring? The team at Solution Cimex can assess the situation and recommend the best option.
Contact us for any questions!