How often should you mow in Cairns? Wet season, dry season and mowing after rain

There is no fixed number of days that suits every lawn. The honest rule is to mow before the grass has grown so far that one cut would take off more than a third of the leaf (see the one-third rule below). What changes through the year is how quickly a Cairns lawn reaches that point, and the rainfall record gives a clear picture of when growth peaks. These are the Bureau of Meteorology's long-term means for the Cairns Aero station, with the interval each season usually calls for.

• December to March, the wet season proper: December averages 193.8mm and January, February and March each average more than 400mm (404.8mm, 437.5mm and 422.1mm), with around 16 rain days a month from January to March and a mean maximum between 30.7C and 31.5C. A fortnightly cut is the realistic minimum. A lawn kept short may need a weekly cut at the peak to stay inside the one-third rule.
• April and May, the tail of the wet: April still averages 201.8mm across 14.5 rain days and 9am humidity sits at 78%, so April usually stays on the wet-season interval. May drops to 92.0mm and growth starts to ease.
• June to September, the dry: each month averages under 50mm (45.5mm, 33.2mm, 26.5mm and 34.1mm) with about 5 to 7 rain days and mean maximums of 25.9C to 28.2C. A lawn that is not watered slows noticeably, and some stretch to three weeks between cuts. A watered lawn keeps growing, so it may still want a fortnightly cut.
• October and November, the build-up: rain stays low (47.2mm and 87.9mm) while mean maximums climb to 29.7C and 30.8C. Expect growth to pick up as the first storms arrive, and have a regular round in place before December rather than after it.

Across the year Cairns averages 2,025.5mm of rain, and about four-fifths of it falls between December and April. That concentration is why a lawn that looked tidy on a monthly cut in August can be a clearing job by February.

Queensland's Environmental Protection Act 1994 sets a default noise standard for regulated devices, a group that includes lawn mowers, line trimmers, mulchers, leaf blowers, generators, compressors and power tools. Under it, a regulated device must not make any audible noise at a neighbouring building at these times:

• Monday to Saturday: before 7am and after 7pm.
• Sundays and public holidays: before 8am and after 7pm.

Local councils can set their own standards by local law, and the default applies where they have not. Cairns Regional Council's noise page lists regulated devices, including power tools, generators and lawn mowers, with no audible noise allowed from 7pm to 7am Monday to Saturday and from 7pm to 8am on Sundays and public holidays, which matches the state default. Council says power tool noise complaints are generally dealt with by Council, and it notes that noise inside the permitted times can still be a nuisance if it is excessive.

In practice, the early-morning cut that avoids the midday heat has to wait until 7am, or 8am on a Sunday. Council's table makes no exception for contractors, so the same hours apply whether you or a mowing service is pushing the mower.

You can, but it does the lawn no favours. Lawn Solutions Australia sets out the problems. A mower struggles to cut wet grass cleanly, so the leaf tears and bruises instead of being sliced, which stresses the plant. Wet clippings clump together and sit on the surface, blocking air and light and creating the conditions fungal diseases such as brown spot like. After rain the blades also lie flatter under the weight of water, so the cut comes out uneven.

The ground matters as much as the grass. Saturated soil lets the mower wheels sink and leave ruts that throw out the lawn level, and in bad cases the mower bogs and rips up turf. There is also the operator: wet grass on a slope with a spinning blade underneath is a slipping risk. In a Cairns wet season, when rain falls on roughly every second day from January to March, the temptation to mow between showers is real, so it pays to know what dry enough looks like.

There is no set number of hours, because it depends on how heavy the rain was, how much sun and wind the yard gets and how well the soil drains. A light overnight shower on a sunny, breezy block may be gone by mid-morning. A heavy February downpour on low, shaded or clay ground can leave a lawn too soft to mow for a day or more. Check the lawn itself rather than the clock.

1. 1Look at the blades. They should be standing up again, not lying flat and glossy with water.
2. 2Walk across it. Your shoes should come away without being soaked, and there should be no squelch or water rising around your foot.
3. 3Check the low spots and shaded corners. These are the last parts to dry and the most likely to rut.
4. 4Run a hand through the grass. If it comes away wet, the clippings will clump. Give it longer.

If the grass passes the first three checks but is still a little damp, cutting at a slightly higher setting with a sharp blade reduces the tearing. If the ground itself is soft, wait. A lawn cut a day late recovers. Ruts from a mower on saturated soil stay until they are levelled.

The one-third rule says to take no more than a third of the leaf height off in any one mow. Lawn Solutions Australia traces it to 1955 research at the US Department of Agriculture, which found that removing more than half of the top growth stopped root growth for an average of 11 days. Keep more of the leaf and the roots keep growing.

It also gives you a simple way to set your interval. If you cut at 40mm, the lawn is due before it passes about 60mm, because cutting 60mm back to 40mm takes off a third. When the wet season is putting that much growth on in a week, the lawn needs a weekly cut to stay inside the rule. When it takes three weeks, a three-week interval is fine.

If a run of wet weather has already let the grass get away, do not try to bring it back in one pass. Raise the mower, take off a third, and step it down over the next few cuts. On a block that has gone well past a standard mow, such as a rental left between tenancies or a yard left through a wet season, that recovery can take hours rather than minutes, which is where a one-off clear followed by a regular round saves the lawn from being scalped.

Each grass variety has its own recommended height, so the first step is knowing what your lawn is. Lawn Solutions Australia's general advice is to mow a little shorter through the warmer months and a little longer through the cooler ones, while keeping to the one-third rule. For a Cairns lawn that means the growing season is also the season that punishes a missed cut, because a lawn kept short has less leaf to spare.

Trisim mulch mows, cutting the clippings finely so they fall back to the root zone rather than being bagged. Regular cuts suit that approach because the clippings stay small, and the same reasoning applies to anyone mowing their own lawn: short, frequent cuts on dry grass leave less for the lawn to digest than one heavy cut on a wet day. If you manage a rental, our rental yard maintenance calendar sets the mowing round alongside the other seasonal yard jobs.

We mow across the Cairns suburbs, including Redlynch, Kewarra Beach, Bayview Heights and Mooroobool. Each suburb page covers what the wet season means for lawns in that part of town.