Central Ontario summers are beautiful — and brutal. From the baking heat of July to the stretch of dry weeks that can follow, lawns across the region take a serious beating between June and August. The good news is that with the right preparation in spring, your lawn can not only survive the summer, but thrive through it.
Start With Your Soil
Everything begins underground. Compacted soil — common after a long Ontario winter — prevents water and nutrients from reaching grass roots. Aerating your lawn in late May or early June allows air, moisture, and fertilizer to penetrate deeply. Follow aeration with a top dressing of compost to improve moisture retention. Healthy soil holds water longer, which becomes critical when the rains stop and temperatures climb.
Feed Smart, Not Heavy
Many homeowners make the mistake of applying heavy nitrogen fertilizer heading into summer. This pushes rapid top growth — exactly what you don’t want during a drought. Instead, apply a slow-release, balanced fertilizer in late spring. This feeds the root system steadily without forcing the plant to produce more leaf than it can sustain without water. Well-rooted grass goes dormant gracefully and recovers faster when rain returns.
Raise Your Mowing Height
Once summer heat arrives, raise your mower deck to three inches or higher. Taller grass shades the soil beneath it, reducing evaporation and keeping roots cooler. It also develops deeper root systems, giving the grass greater access to sub-surface moisture. Avoid cutting more than one-third of the blade at any single mowing — stressed grass cut too short in heat goes into shock quickly.
Water Deeply and Infrequently
If you water, do it right. Light, frequent watering encourages shallow roots that are highly vulnerable to drought. Instead, water deeply once or twice per week — enough to penetrate four to six inches into the soil. Water early in the morning to minimize evaporation and reduce the risk of fungal disease. A rain gauge or soil moisture probe takes the guesswork out of the equation.
Let It Rest
Finally, accept that dormancy is not death. Cool-season grasses like Kentucky bluegrass and fescue — the workhorses of central Ontario lawns — naturally go dormant and turn brown during extended drought. This is a survival mechanism, not a failure. Avoid heavy traffic on dormant turf, hold off on fertilizing, and resist the urge to overwater. When fall rains arrive, your lawn will green up again on its own.
Preparation is everything. A little work in spring means your lawn enters summer resilient, rooted, and ready.
