Winter lawn care: what to do (and what to skip)

Winter is the season most people get wrong — not by doing too little, but by doing too much. Half the panic-driven jobs people take on in the cold either waste your time or actively harm the lawn. Good winter lawn care is mostly about restraint: knowing what your grass is doing under there, keeping off it at the wrong moments, and saving your energy for spring. This guide walks you through both warm-season and cool-season lawns so you can relax through the cold months and come out the other side with a healthier lawn than the neighbours who fussed all winter.

First, work out what your grass is actually doing

Everything about winter care hinges on grass type, so start here.

Warm-season grasses — buffalo (St Augustine), couch (Bermuda), kikuyu, zoysia — evolved for heat. When soil temperatures drop below roughly 10°C, they slow right down and go dormant: growth stops, and the leaves fade to straw-brown or purple-brown.

Cool-season grasses — perennial ryegrass, tall fescue, Kentucky bluegrass — keep going in the cold. They'll slow down and may pale slightly, but they stay noticeably greener and keep growing enough that you can't just walk away for three months.

The key insight: a brown warm-season lawn in winter is not a dead lawn — it's a sleeping one. Dormancy is a survival strategy, not a distress signal. The worst thing you can do is treat it like an emergency.

Warm-season lawns: mostly, leave them alone

If your buffalo or couch has gone the colour of a cardboard box, that's exactly what it's supposed to do. The crown and roots are alive and waiting for warmth. Your job is to not get in the way.

Mowing

• Cut way back on frequency. Dormant grass barely grows, so you might go a month or more between mows. Some people don't mow at all through the coldest stretch.
• Raise the blade a notch. A slightly longer leaf (say 30–40mm for couch, a bit higher for buffalo) captures more of the weak winter sun and protects the crown.
• Never mow when frost is on the grass or the lawn is soggy. More on frost below — it matters.

Fertiliser — skip it

Don't feed a dormant warm-season lawn. It can't use nitrogen it isn't growing to absorb, so most of it just leaches away or, worse, feeds winter weeds instead of your grass. Save your fertiliser for when soil temperatures climb back above 15°C in spring. (If you want to do one useful thing, a soil-conditioning product with potassium in late autumn can improve cold and disease tolerance going into winter — but that's an autumn job, not a winter one.)

Watering

Cut right back. Cool air and low evaporation mean the lawn needs very little, and overwatering a dormant lawn invites fungal problems. Only water if you've had a genuinely dry, windy spell.

Winter weeds

This is the one active job worth doing. While your grass sleeps, cool-season weeds wake up — winter grass (Poa annua), bindii, clover, capeweed and creeping oxalis all thrive in the gap. Handle them like this:

• Pull bindii before it seeds. Those spiky burrs in spring come from a plant you could've pulled or sprayed now, while it's small.
• Spot-spray broadleaf weeds with a selective herbicide (look for dicamba or an MCPA/dicamba blend) on a mild, still day. Check the label lists your grass type — some warm-season grasses are fussy.
• For Poa annua, hand-weed small patches; for bigger invasions, a pre-emergent applied in late autumn is the real fix for next year.

Cool-season lawns: tick over, don't push

Ryegrass and fescue stay in the game all winter, so you can't fully switch off — but you're still dialling everything down.

Mowing

• Mow occasionally, on a dry day. Growth is slow, so maybe once every 2–4 weeks. Only cut when the grass is genuinely dry and no frost is present.
• Don't scalp it. Keep it on the longer side (around 40–50mm). Longer leaves photosynthesise better in low light and shade out weeds.

Feeding — light and optional

Cool-season lawns can take a light winter feed because they're still growing, but keep it gentle. Choose a slow-release, low-nitrogen fertiliser, or one marketed as a winter/cold-season blend with a higher potassium ratio to support root health and cold tolerance. Avoid heavy quick-release nitrogen — it forces soft, lush growth that's vulnerable to frost and disease.

The rest

Watering needs are minimal, same as warm-season. Winter weeds are less of a problem because the turf stays dense, but spot-treat anything that pops through on a mild day.

Frost care: the rule that applies to everyone

Frost is where good intentions do real damage, regardless of grass type.

When grass freezes, the water inside each leaf cell turns to ice crystals. Walk across it, mow it, or let the dog tear around on it, and those crystals rupture the cell walls. The result is the classic frozen footprint — a trail of blackened, dead leaf blades that shows up as brown marks a day or two later and can linger for weeks.

• Stay off frosty lawns entirely until the frost has melted and the grass is dry — usually mid-to-late morning once the sun's been on it.
• No mowing, no play, no wheelbarrows across a white lawn. Reroute foot traffic if you have to.
• Don't try to "help" by watering off the frost in the early morning unless you know what you're doing — you can make it worse.

Winter jobs at a glance

Frequently asked questions

Should I fertilise my lawn in winter?

For warm-season lawns (buffalo, couch, kikuyu), no — they're dormant and can't use the nutrients, so it's wasted and often feeds weeds. Cool-season lawns can take a light, slow-release, low-nitrogen feed since they're still growing, but it's optional.

Why has my lawn gone brown in winter — is it dead?

If it's a warm-season grass, it's almost certainly dormant, not dead. The leaves brown off to conserve energy while the crown and roots stay alive, and it'll green up again as soil temperatures rise in spring.

Can I walk on my lawn when it's frosty?

No. Frozen grass blades are brittle, and foot traffic ruptures the frozen cells, leaving brown "frost footprints" that can take weeks to recover. Wait until the frost has melted and the grass is dry, usually late morning.

How often should I mow in winter?

Warm-season lawns may need no mowing at all, or once a month at most. Cool-season lawns tick over slowly — expect once every 2–4 weeks, always on a dry, frost-free day, and keep the blade high.

When do I start feeding and fertilising again?

Wait until soil temperatures climb back above about 15°C in spring and you see active green growth returning. That's the signal your lawn can actually use the nutrients you give it.

How Lawnova takes the guesswork out of winter

Lawnova reads your grass type, your region and your local conditions, then tells you exactly what to do each week — including when to genuinely do nothing. No more panic-fertilising a dormant lawn or mowing off a frost. You get a simple, season-aware plan that flips automatically whether you're in the northern or southern hemisphere, so the advice always matches what your grass is really doing.

Get your free Lawnova plan

Rest easy this winter — the best-looking lawns in spring belong to the people who knew when to leave well alone.