How Often Should You Mow Your Lawn in Ontario? Weekly vs Bi-Weekly

One of the most common questions Kitchener-Waterloo homeowners ask is: "How often should I mow?" The answer depends on the time of year, your grass type, and what you want your lawn to look like.

The One-Third Rule

Before choosing a frequency, understand the fundamental rule of mowing: never remove more than one-third of the grass blade in a single cut. Removing more causes stress, weakens roots, and makes your lawn vulnerable to weeds, drought, and disease.

For a lawn maintained at 6-7 cm (the ideal height for KW cool-season grasses), this means you should mow when the grass reaches about 9-10 cm. How fast that happens depends entirely on the season.

Growth Rates by Season in Kitchener-Waterloo

Ontario cool-season grasses grow at different rates throughout the year:

• April - Early May (Spring start): Slow growth, 1-2 cm per week. Bi-weekly or monthly mowing is usually sufficient.
• Mid May - June (Peak spring growth): Fast growth, 3-5 cm per week. Weekly mowing is strongly recommended — bi-weekly often means cutting too much at once.
• July - August (Summer heat): Growth slows to 1-3 cm per week depending on rainfall. Bi-weekly is often fine, especially during dry spells.
• September - October (Fall recovery): Growth picks up again, 2-3 cm per week. Weekly or bi-weekly both work well.
• Late October (Season end): Growth stops. Final cut of the season.

Weekly Mowing: When It's Worth It

Weekly mowing is the gold standard for lawn health. Here's why:

• Consistently follows the one-third rule — you're never removing too much at once
• Mulched clippings decompose faster — smaller clippings break down quickly, feeding the soil
• Discourages weeds — frequent cutting prevents weeds from going to seed
• Looks better — a weekly-cut lawn looks professionally maintained year-round
• Prevents the "jungle to golf course" cycle — no dramatic swings between overgrown and freshly cut

At CutDay, our weekly plan starts at $30/visit — that's the best per-visit rate we offer because frequent, consistent mowing produces better outcomes and is easier on equipment.

Bi-Weekly Mowing: When It Works

Bi-weekly mowing can work well in these situations:

• July and August: When heat slows growth, bi-weekly keeps up
• Shaded lawns: Less sunlight means slower growth
• Budget-conscious homeowners: Bi-weekly costs roughly half of weekly over the season
• Low-traffic lawns: Properties where appearance isn't the top priority

The trade-off: during peak growth (May-June), bi-weekly usually means the grass gets too tall between cuts. Your crew has to remove more than one-third per cut, which stresses the lawn and leaves visible clumps of clippings.

Monthly Mowing: The Reality

Monthly mowing is technically available but isn't recommended for most KW lawns. During peak growth, a month between cuts means the grass can reach 15-20 cm — well beyond what a single cut can handle without scalping.

Monthly works best for properties with very low-maintenance requirements, like vacant lots or cottage properties visited occasionally.

Cost Comparison for the KW Season

Here's what a typical 26-week mowing season (mid-April through October) looks like in Kitchener-Waterloo:

• Weekly (26 cuts): ~$780 - $1,040 for the season depending on lawn size
• Bi-weekly (13 cuts): ~$455 - $585 for the season
• Monthly (6 cuts): ~$240 - $510 for the season

Weekly costs more per season but delivers significantly better lawn health and appearance. Many homeowners find that the incremental cost of going from bi-weekly to weekly is worth it for the visible improvement.

Our Recommendation for KW Homeowners

If budget allows: weekly from mid-April through October. This is what we recommend to every customer because it produces the best results and follows the one-third rule consistently.

If budget is tight: bi-weekly from mid-April through October, with weekly during May-June. Some CutDay customers switch between plans seasonally — going weekly during peak growth and bi-weekly during summer heat. We make this easy to adjust in your account.

Whatever you choose, get your instant price and see what plan fits your lawn and budget. All CutDay plans include edging, trimming, blow-off, and photo proof — no hidden add-on fees.