When should you stop cutting grass in Ontario? Learn the right time for your last mow, how short to cut before winter, and how to avoid snow mold.
Every fall, Ontario homeowners face the same question: is it time to put the mower away, or does the lawn need one more cut? It's a more important decision than it seems. The last mow of the season has a bigger effect on how your lawn looks next spring than any other cut of the year.
Stop too early and your grass heads into winter long, which invites problems under the snow. Cut too short too suddenly and you weaken the roots right before the hardest season. Here's how to time it right.
Start mowing when the grass is growing again and the ground is firm enough to walk on, which in most of Ontario means mid to late April. If your footprints sink into the lawn, it's too soft and wet to mow. And if the grass is green and clearly taller than it was last week, it's ready for its first cut.
Keep the first mow of the season on the higher side. A gentle first trim cleans up the winter growth without stressing grass that's still rebuilding its roots. If leaves and debris are left over from fall, clear them first with a spring cleanup.
Stop mowing when daytime temperatures stay consistently below 10°C, because that's when grass stops growing. In the Toronto area and along the lakeshore, that usually happens in late October or early November. Further north, it often comes a week or two sooner.
The simple rule is to keep mowing as long as the grass keeps growing. A warm fall can stretch the season into November, and there's nothing wrong with a late-season mow if your lawn needs it. The bigger mistake is putting the mower away in early October and sending the lawn into winter too long.
For the final cut of the season, bring your lawn down to about 5 to 6 cm, shorter than the 8 cm you'd keep it in summer. Don't do it all at once, though. Lower the height gradually over the last two or three mows so no single cut removes more than a third of the blade.
Long grass flops over under the snow and stays matted and damp for months. Grass cut too short enters winter with weakened roots. The 5 to 6 cm range gives your lawn the best odds of coming out of winter healthy.
The main reason the final cut matters is a lawn disease called snow mold. It's a fungus that grows under snow cover, and long, matted grass creates exactly the damp conditions it loves. It shows up in March as grey-white crusty patches across the lawn.
Mild cases of snow mold recover on their own once the lawn dries out. Bad cases mean raking and overseeding in spring, all of which could have been prevented by one last mow in late October. Long grass under snow also shelters voles, which carve winding trails through lawns over the winter.
The last mow and leaf cleanup go hand in hand, because you can't properly cut a lawn that's buried in leaves. A light scattering can simply be mowed over and mulched into the grass. But once leaves cover most of the lawn, they need to come off before the final cut, since a thick layer left over winter smothers the grass and doubles your snow mold risk.
That's why a proper fall cleanup includes both: leaves removed from the lawn and garden beds, then a final mow at winter height.
The last cut of the season is the one homeowners most often skip. The weather is cold, the mower has been put away, and the lawn doesn't look like it's growing much. At LocalStudent, our local students handle fall cleanups and final mows across Ontario, so your lawn goes into winter short, clean, and set up for a healthy spring.
We offer quality lawn mowing and leaf cleanup services in the following locations:
Ajax, Aurora, Barrie, Brampton, Burlington, Cambridge, Etobicoke, Guelph, Hamilton, Kingston, Kitchener, London, Markham, Mississauga, Newmarket, North York, Oakville, Oshawa, Ottawa, Pickering, Richmond Hill, Scarborough, Thornhill, Toronto, Vaughan, Waterloo, and Whitby.
Contact LocalStudent for a free quote today, and finish your lawn season the right way!
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