How Often to Cut Grass in Quebec: A Monthly Guide
It sounds like a simple question — how often should I mow my lawn? — but the answer changes completely depending on the time of year. Mowing the same way every week from May to October is one of the most common mistakes Quebec homeowners make, and it shows: lawns that are cut too often during stress periods thin out, and lawns that are neglected during peak growth turn into a jungle that's hard on the mower and hard on the grass.
Here's how to dial in your mowing frequency month by month for Vaudreuil-Dorion, Saint-Lazare, and the surrounding Quebec region.
The One Rule That Never Changes: The One-Third Rule
Before we get into the monthly breakdown, one principle applies in every month of the season: never remove more than one-third of the grass blade in a single mowing session. Cut more than that and you stress the plant, expose the crowns to sun and heat, and trigger a stress response that diverts energy away from root growth.
If your lawn gets ahead of you (vacation, a rainy week, a busy stretch), resist the temptation to whack it all the way down in one cut. Drop it in two or three sessions over a week, lowering the deck slightly each time.
For grass type guidance and ideal mowing heights by variety, [link to article #5] covers Kentucky bluegrass, fescue, and ryegrass — the most common turf species in Vaudreuil-Soulanges lawns.
May: Every 10–14 Days as the Lawn Establishes
May is a transition month. The lawn is waking up and building root mass, but it's not yet in full growth mode. The first cut shouldn't happen until the soil is firm and soil temperature has reached 10°C — typically around May 10–18 in most West Island and Vaudreuil-Dorion years. [link to article #2] explains exactly when to take that first cut and why timing matters.
Once you've done your first mow, let the lawn recover for 10–14 days before mowing again. The grass is still putting significant energy into root development, and cutting too frequently in May prevents it from building the deep roots it needs to survive the summer. Keep the blade high — 7–8 cm minimum.
- Frequency: Every 10–14 days
- Blade height: 7–8 cm
- What to watch: Soil firmness, spring repairs, overseeding of bare patches
June: Weekly — This Is Peak Growth Season
By June, the lawn has made the full transition to active growth. Cool, moist June weather in Vaudreuil-Soulanges is perfect for grass — it's growing fast, and weekly mowing is generally the right rhythm. Skip a week and you'll find yourself violating the one-third rule trying to catch up.
Keep the blade at 7–8 cm. You can drop to 6.5 cm if you prefer a shorter lawn, but going lower than that in Quebec is not recommended — it leaves the crowns too exposed and makes the lawn more vulnerable to the summer heat that typically arrives in late June and July.
- Frequency: Weekly (every 6–8 days)
- Blade height: 7–8 cm
- What to watch: Fertilizer timing [link to article #6], first signs of chinch bugs or crabgrass [link to article #7]
July: Adjust Based on Heat and Rain
July is where many Quebec lawns show their weakness — particularly during hot, dry stretches when the grass goes semi-dormant to conserve moisture. In Vaudreuil-Dorion summers, we often see periods of 30°C+ temperatures with minimal rain, and the lawn responds by slowing growth dramatically.
Raise your mowing height in July. Setting the deck 1–2 cm higher than your June height (so 8–9 cm) does several important things:
- Taller grass shades the soil, reducing evaporation
- Longer blades photosynthesize more efficiently under heat stress
- Deeper shade inhibits crabgrass germination and establishment
Reduce mowing frequency when growth slows. In a hot, dry July, you may only need to mow every 10–14 days. Don't mow just because it's Saturday — look at the lawn and apply the one-third test. If it hasn't grown enough to justify cutting, skip the week.
Note: If your municipality has summer watering restriction bylaws in effect (Vaudreuil-Dorion and surrounding municipalities periodically implement odd/even watering schedules during dry spells), follow those rules and let the lawn go slightly dormant rather than overwatering. Dormant grass is not dead grass — it recovers when rain returns.
- Frequency: Weekly in cool, rainy periods; every 10–14 days during heat waves
- Blade height: 8–9 cm (raise from June setting)
- What to watch: Drought stress (blue-grey tint, footprint test), chinch bug damage
August: Recovery Mode Begins
Late August typically brings cooler nights and often some rain back to the Vaudreuil region, and the lawn starts to recover from summer stress. This is a great time for overseeding thin areas and for your late-summer fertilizer application — [link to article #6] has timing details.
Mowing frequency picks back up toward weekly as the grass resumes active growth. Begin gradually lowering the mowing height back toward 7–8 cm if you raised it in July — do it over two or three cuts, not all at once.
- Frequency: Every 7–10 days, trending toward weekly by month end
- Blade height: 7–8 cm (gradually bringing down from July height)
- What to watch: Recovery from summer thin spots, grub damage appearing in late August [link to article #7]
September: Back to Weekly — The Fall Growth Window
September is arguably the best month of the Quebec growing season. Temperatures are ideal, there's usually reasonable rainfall, and the lawn puts on impressive growth. Weekly mowing returns and the grass is responding vigorously.
This is also prime time for lawn care tasks that complement mowing:
- Aeration [link to article #13] — fall is the best window in Quebec
- Overseeding thin or damaged areas
- Fall fertilizer application with a winterizer product
Keep blade height at 7–8 cm. The temptation is to start cutting shorter as you head toward fall, but taller going into dormancy is better for the plant.
- Frequency: Weekly
- Blade height: 7–8 cm
- What to watch: Aeration and overseeding window, fall fertilizer timing
October: Final Cuts Before Dormancy
October is about preparation, not aesthetics. The lawn is slowing down and you're mowing less frequently — but the last two or three cuts of the season matter. The goal is to leave the lawn at 6–7 cm going into winter. This is a specific height chosen for good reasons:
- Too long (over 9 cm): risks matting under snow, creating ideal conditions for snow mould
- Too short (under 5 cm): exposes crowns to freeze-thaw cycles and desiccation
Start lowering your mowing height gradually in early October, bringing the lawn down to 6–7 cm over two or three cuts. Take your last cut when the grass stops growing — typically late October in Vaudreuil-Dorion and the West Island, though a warm fall can push that into early November.
Don't wait for the first freeze to take your last cut. A frozen lawn should not be mowed.
- Frequency: Every 10–14 days, reducing to as-needed
- Blade height: 7–8 cm early, finishing at 6–7 cm for final cuts
- What to watch: Leaf removal [link to article #12] before snow, fall cleanup [link to article #4], final fertilizer (winterizer) timing
Frequently Asked Questions
Is it bad to mow wet grass? Yes, for a few reasons: wet clippings clump together and smother the turf; the mower can tear blades rather than cut them cleanly; and wet soil is more easily compacted by mower wheels. If possible, wait until the surface moisture has dried even if the forecast shows rain later.
Should I bag clippings or leave them? Leave them whenever the grass isn't excessively long. Grass clippings decompose quickly and return valuable nitrogen to the soil — some estimates put the fertilizer value of returned clippings at 25–30% of annual nitrogen needs. The only time to bag is when you've let the grass get too long and the clippings would smother the turf below.
My lawn looks brown in July. Should I still mow it? A blue-grey or brownish tinge in July is usually a sign of drought semi-dormancy, not death. Dormant grass doesn't need to be mowed — it's not growing. Check with the one-third test: if the grass hasn't grown enough to warrant cutting, skip the mow. Resume mowing normally when rain returns and the grass greens back up.
Mowing frequency is one of those things that looks simple but has a real impact on lawn health over time. If you'd like consistent, properly timed grass cutting all season without thinking about it, GrassKing serves Vaudreuil-Dorion, Saint-Lazare, Hudson, Île-Perrot, Pincourt, and surrounding communities with regular grass cutting schedules tailored to the Quebec growing season. Get in touch to set up your seasonal service.
Questions about this topic? Call us directly — Ralph: 514-607-6933 — Tim: 438-378-4078