How often should you mow your lawn? (by season and grass type)

Most Australian lawns need a weekly mow through spring and summer, tapering to every two to three weeks in autumn and monthly or less over winter — but that's a rough starting point, not the real rule. The real rule is the one-third rule: never take off more than a third of the leaf height in a single cut. Follow that, and your grass type, the weather and the season decide the schedule for you, rather than a date on a calendar.

The one-third rule: the schedule behind the schedule

The one-third rule is simple: if you keep a lawn at, say, 30mm, you mow again once it reaches around 45mm — never let it get so long that a single cut has to remove more than a third of that height. Cut deeper than that and you scalp the plant, exposing the crown (and in runner grasses like buffalo, the stolons) to sun stress, weed invasion and disease. It also shocks the plant into spending energy on leaf recovery instead of root and lateral growth.

The practical upshot is that frequency isn't fixed — it moves with how fast the grass is actually growing. A lawn putting on 15mm a week in November needs a weekly mow to obey the rule; the same lawn in July might put on 15mm in a month, so mowing weekly would mean cutting almost nothing, and mowing monthly is the better fit. Mowing more often when the grass is growing fast, and easing off when it isn't, is also what keeps a lawn thick: regular, light cuts push grass to spread sideways and fill in, while infrequent, heavy cuts do the opposite and thin it out.

Mowing frequency by season (southern Australia)

This is the general pattern for the warm-season grasses behind most lawns in Victoria and southern Australia — buffalo, couch and kikuyu. Cool-season lawns such as tall fescue follow a similar shape but stay active later into autumn and start growing again earlier in spring.

Season	Typical mowing frequency	Why
Spring (Sep–Nov)	Every 2–3 weeks in September, ramping up to weekly by November	Growth accelerates as soil warms
Summer (Dec–Feb)	Weekly, sometimes every 5 days for fast growers after rain	Peak growth of the year
Autumn (Mar–May)	Every 2–3 weeks	Growth slows as temperatures drop
Winter (Jun–Aug)	Monthly or less, only when it visibly needs it	Most lawns are close to dormant

For the month-by-month version of this, including fertilising and weed timing alongside mowing, see our Victorian lawn care calendar.

Mowing frequency by grass type

Grass type changes both the mowing height and how often you'll be back out there, because some grasses simply grow faster than others.

Grass type	Mowing height	Peak season	Cooler months
Buffalo (e.g. Sir Walter)	35–50mm	Every 7–10 days	Roughly monthly
Kikuyu	25–40mm	Weekly	Roughly monthly
Couch (green)	15–25mm	Weekly	Every 3–4 weeks, raised to 25–30mm
Tall fescue (cool-season)	40–70mm, higher in shade or summer heat	Every 5–7 days in autumn & spring	Slower through winter and the height of summer

Buffalo is the one to be most careful with — it doesn't tolerate a low, frequent scalp the way couch and kikuyu do, since cutting into the stolons stresses the plant and opens bare patches to weeds. Our buffalo grass care guide and kikuyu grass care guide go through exact heights, fertilising schedules and common problems for each. Not sure which grass you've got? Buffalo has broad, soft blades and grows via stolons across the surface; kikuyu and couch have finer blades and spread more aggressively, including under fences and into garden beds.

What throws the schedule out

Rain and growth spurts

A run of warm, wet weather can push a lawn to need mowing twice in a week even in a season where it's normally fortnightly — the one-third rule still applies, so if the grass has grown fast, it needs cutting sooner rather than waiting for "the usual day". Conversely, a dry spell without irrigation can stretch a weekly mow out to every ten days without any harm done.

Wet grass

Mowing wet grass is worth avoiding where you can. It cuts unevenly, clumps and can clog the mower deck, and driving a mower over saturated soil risks compacting it and leaving wheel ruts. If rain is forecast and you're on a schedule, mowing the day before beats mowing the day after — or just wait a few hours of sun or wind for the lawn to dry out.

Heatwaves

Hold off mowing during the worst of a heatwave if you can. Grass under heat stress is more easily damaged by cutting, and removing leaf cover takes away the shade that protects the soil and root zone. If a hot stretch drags on and the lawn genuinely needs a cut, mow early morning or evening rather than the middle of the day, and raise the cutting height a notch — a slightly taller lawn copes with heat noticeably better than one cut low.

Shade

Grass in part-shade grows more slowly than the same lawn in full sun, so shaded areas typically need less frequent mowing — but should be cut a little higher, not lower, since extra leaf surface helps a shaded plant capture what light it does get.

Signs you've got the frequency wrong

A lawn mowed too infrequently starts looking patchy and thin after each cut, because so much leaf is removed at once that the plant is left recovering rather than growing. It's also more prone to weeds moving into the bare ground that a hard scalp exposes. On the other end, a lawn mowed too short too often — chasing a "neat" look by dropping the deck lower rather than mowing more frequently at the right height — thins out for the same underlying reason: not enough leaf left to photosynthesise and recover between cuts. If a lawn has already been let go and needs a bigger tidy-up than routine mowing, that first cut is a different job — our lawn mowing cost guide covers why an overgrown one-off mow costs more than staying on a regular schedule.

A few practical signs the interval needs adjusting, in either direction:

• Scalping needed to fix it — if every mow means cutting the lawn back hard just to get it under control, too much growth has accumulated between cuts.
• Clippings smothering the lawn — thick clumps sitting on top of the grass after mowing are a sign the interval between cuts was too long, not a sign of a mower problem.
• Yellow or brown striping after a cut — mowing off more than a third of the blade at once shocks the grass; the discolouration often shows within a day or two.
• Weeds establishing in bare or thin patches — a lawn mown too infrequently (or too short) thins out and gives weeds like bindii and clover room to get started.

What height should you actually cut it to?

Height and frequency work together — the one-third rule only works if you know your lawn's target height in the first place. As a rough guide, buffalo sits happiest around 35–45mm, kikuyu at 25–40mm, and couch a little shorter again. Cutting too short (scalping) between mows to "get ahead" does more harm than good: it stresses the crown, lets more sunlight reach weed seeds in the soil, and usually means more frequent watering just to stop the lawn browning off. For exact heights across every common Australian lawn type, including zoysia and tall fescue, see our lawn mowing height guide.

What times can you legally mow in Victoria?

Worth knowing before you fire up the mower on a weekend morning: under Victoria's Environment Protection (Residential Noise) Regulations 2021, lawn mowers and similar garden power equipment are restricted to 7am–8pm on weekdays and 9am–8pm on weekends and public holidays. Mowing outside those hours is the most common source of noise complaints between neighbours, so it's worth working to them even if your own council doesn't actively enforce it.

Should you leave the clippings on the lawn?

If you're mowing on a sensible schedule and following the one-third rule, yes — leave them. Fine clippings from a properly timed mow break down within a couple of weeks and return nitrogen and other nutrients to the soil, acting like a light, slow-release feed. The exception is an overgrown lawn: long, clumped clippings sitting on top of the grass will smother and yellow it, so rake or catch those off rather than leaving them.

Frequently asked questions

Is it bad to mow your lawn too often?

Not if you're following the one-third rule — mowing often is fine, and actually encourages a denser lawn, as long as each cut removes no more than a third of the leaf height. What's bad is mowing too short too often, which stresses the plant rather than thickening it.

Should you mow before or after it rains?

After, once the lawn has dried out. Wet grass cuts unevenly, clumps and clogs the mower, and can leave wheel ruts in saturated soil. If rain is forecast and you're on a schedule, mowing the day before is the better order.

Is it okay to mow in a heatwave?

Better to hold off during the worst of it. If a hot spell stretches on and the lawn genuinely needs a cut, mow early morning or evening, raise the height a notch, and skip it on the worst days.

Does mowing more often make your lawn thicker?

Yes, within reason. Frequent mowing that follows the one-third rule encourages grass to spread sideways rather than just upward, filling in bare patches and crowding out weeds. Mowing rarely and taking off a big chunk each time does the opposite.

What times can I legally mow my lawn in Victoria?

Under Victoria's residential noise regulations, mowers and similar garden power equipment shouldn't be used before 7am or after 8pm on weekdays, or before 9am or after 8pm on weekends and public holidays. If you're unsure, your local shire can confirm how it applies in your area — and if you'd rather not think about timing at all, our regular mowing service handles the whole schedule for you.