Clover Mites in Calgary: Why They Invade and How to Get Rid of Them
Quick answer: Clover mites are tiny plant-feeding mites that live in the lawn and garden beds next to your house. They migrate in the hundreds onto warm walls each spring and fall, then wander inside through window tracks, weep holes and foundation gaps. They do not bite and they cause no damage to the house, but breaking the link between the lawn and the wall is what stops the invasion.
What clover mites are
Clover mites are mites, not insects. They are roughly the size of a pinhead and reddish-brown, which is why they look like moving red grit or dust. They feed on grass, clover, lawn weeds and nearby plants. They do not feed on people, pets, furniture or the structure of your home.
The two migration windows in Calgary
Clover mites move in two predictable waves:
| Season | What triggers it | |---|---| | March to May | Turf wakes up and mites move out of the lawn onto the house | | September to October | Cool nights and drying soil push them toward warm foundations and sunny walls | | Warm chinook days in winter | Smaller flushes appear on south and west-facing walls |
The pattern is always the same: cool nights, warm sunny days, and mites walking upward and inward until they find a way in.
Why they show up on walls and windowsills by the hundreds
Because that is where they collect. Clover mites climb the sunniest side of the house, gather in window frames and sills, and move through the first gap they find: window tracks, weep holes, door thresholds, vent openings and foundation cracks. Once inside and away from their food, they dry out and die within a few days.
Do clover mites bite?
No. Clover mites do not bite, sting or feed on blood, and they do not carry disease. Some people notice mild irritation or itching after brushing against a large number of them, but that is mechanical irritation, not a bite.
Why the red stains show up
When clover mites are crushed they leave a red-brown mark. That is what stains walls, sills, curtains and light-coloured furniture. The practical fix is to wipe rather than squash: a damp cloth with mild soapy water removes them without leaving pigment behind.
How to get rid of clover mites
1. Create a vegetation-free margin
This is the most effective long-term step. Keep a 12 to 18 inch strip of gravel, stone or paving between the lawn and the foundation. Where grass, clover or dense ground cover touches the wall, mites walk straight from the lawn onto the siding.
2. Seal the entry points
Clean and seal window tracks, caulk foundation cracks, fit door sweeps, and check weep holes and vents. Mites do not force their way in, they walk through the first opening available.
3. Manage the turf beside the house
Keep grass short at the wall, avoid over-watering beds against the foundation, and pull clover and creeping weeds out of the soil margin. Bare soil or gravel holds far fewer mites than thick turf.
4. Wash instead of crushing indoors
Vacuum or wipe sills, frames and curtains with soapy water. Avoid pressing mites into painted surfaces or fabric.
5. Treat the exterior barrier
For repeated invasions, a professional exterior treatment of the foundation wall, the soil margin and the adjacent turf stops the migration in days. Treating the wall alone is usually not enough, because the mites keep arriving from the lawn.
What clover mite treatment costs in Calgary
Clover mite treatment starts at $300. The price depends on how much exterior wall and turf margin has to be treated, how many window tracks, weep holes and thresholds need sealing, and whether the property has both a spring and a fall migration, in which case both visits are quoted together. See our clover mite control Calgary page, our earwig control Calgary page for the other garden insect that invades Calgary homes, or pest control prices Calgary for every service price.
Preventing next season's invasion
- Gravel or stone strip along the foundation, kept clear of grass
- Grass and ground cover trimmed back from the siding
- Window tracks cleaned and sealed each spring
- Weep holes and vents screened
- Turf margin treated in early spring and again in early fall on problem properties
When to call Calgary Pest Guard
Call (825) 760-5364 if clover mites are getting inside rather than just appearing on the outside wall, if they are staining curtains and sills, or if the migration happens every year. We treat the exterior barrier, seal the entry points and mark out the vegetation-free margin that ends the cycle. Licensed, insured, and every treatment is guaranteed.