The honest answer is: it changes through the season, and the lawn — not the calendar — should decide. Here’s the month-by-month reality for Guelph.
The rule that decides everything
Never remove more than one-third of the grass blade in a single cut. That rule, plus how fast your grass is growing, dictates frequency. Cut a 4.5-inch lawn to 3 inches and you’re perfect; let it hit 6 inches and every option is bad — scalp it or cut it twice.
May–June: weekly, non-negotiable
Peak growth in Guelph. Grass can grow an inch or more a week, so weekly mowing is the only schedule that stays inside the one-third rule. Biweekly cutting in June is why so many lawns look ragged and stressed by July.
July–August: let the lawn vote
In a wet summer, weekly continues. In a dry spell, growth slows or the lawn goes dormant — and mowing dormant grass damages it. We proactively tell clients to skip weeks when the lawn doesn’t need cutting, which is easy to do when nobody’s locked into a contract.
September–October: weekly again, then taper
Cool-season grass surges again in fall. Keep weekly cuts through September, then taper with growth until the final cut — our fall checklist covers that last-cut height.
Our weekly mowing service is built around exactly this rhythm, from $27.50 per cut with trimming and blowdown included.