Short answer: Many Northern Ontario lawns need cutting every 7 to 14 days while they are actively growing. Spring growth may demand the shorter end of that range; heat or drought can slow growth enough to extend it. The deciding rule is to remove no more than one-third of the blade in a single cut.
The one-third rule is more useful than the calendar
Choose a healthy target height, then mow before the grass is more than one-third taller than that target. For example, the University of Minnesota notes that a 3-inch lawn should be cut before it exceeds about 4.5 inches. Removing too much leaf at once can scalp the lawn, expose soil to heat and make recovery harder.
Ontario turf guidance recommends a roughly 4 to 6 cm mowing range for home lawns. In practice, a somewhat taller setting is often useful during summer stress, and the correct height also depends on grass type and site conditions.
A practical seasonal guide
| Seasonal condition | What usually happens | How to respond |
|---|---|---|
| Cool, wet spring | Growth can be fast once the ground firms up. | Check weekly and mow when the one-third threshold is near. |
| Early summer | Growth is often steady with normal rainfall. | A 7 to 14 day rhythm works for many residential lawns. |
| Hot or dry spell | Growth slows and turf is easily stressed. | Raise the mowing height and extend the interval if the grass has not grown enough. |
| Late summer rain | Growth may accelerate again. | Shorten the interval only if needed to stay within the one-third rule. |
| Fall | Growth slows as temperatures fall. | Continue while growth continues; stop once it has effectively ended. |
Should every lawn be cut weekly?
No. A weekly appointment is easy to remember, but the grass does not grow by appointment. Penn State Extension recommends basing mowing frequency on growth; spring conditions can require more frequent mowing, while drought may pause mowing until growth resumes.
On the other hand, letting a fast-growing lawn go too long and then cutting it very short is not a good trade. If a scheduled service interval regularly pushes the lawn beyond the one-third limit, the cutting frequency or target height should change.
Our Sault Ste. Marie schedule
2 Brothers Lawn Care currently provides 12 scheduled cuts every other Saturday from May through one final cut in early October. That schedule suits the residential route and keeps pricing predictable. We monitor conditions, use an appropriate seasonal height and do not force a cut on saturated turf. Homeowners with unusually fast growth, irrigation or highly fertilized turf may need a different frequency.
Three habits that improve every cut
- Keep the blade sharp. A clean cut loses less moisture and looks better than a torn edge.
- Change direction. Alternating patterns reduces repeated wheel tracks and encourages upright growth.
- Leave fine clippings. Small clippings return nutrients and normally do not cause thatch.
Need a dependable local schedule?
See what is included in our regular lawn care service, review 2026 package pricing, or request a free quote.