Winter Lawn Care Guide: How to Keep Your Turf Healthy Through the Cold Months

Winter in Australia doesn't mean your lawn has to suffer. With the right approach, you can protect your turf through the cold months and set it up for a strong spring comeback. Here's everything you need to know about winter lawn care.

Why Winter Lawn Care Matters

Most turf varieties slow their growth significantly in winter, but that doesn't mean they stop needing attention. Neglecting your lawn during the cooler months can lead to thinning, weed invasion, disease, and a slow, patchy recovery come spring. A little effort now pays off big when the warm weather returns.

1. Adjust Your Mowing

Raise your mowing height in winter. Longer leaf blades help insulate the soil, retain moisture, and protect the crown of the plant from frost damage. Mow less frequently — your lawn is growing slower, so it doesn't need it as often. Avoid mowing wet or frosted grass, as this can damage the blades and compact the soil.

2. Fertilise Before the Cold Sets In

If you haven't already, apply a high-potassium fertiliser like ProTurf Hi K before temperatures drop. Potassium is the key nutrient for hardening turf against cold stress, disease, and wear. It strengthens cell walls and improves the plant's ability to handle frost and low temperatures.

Apply at 20–35g per m² and water in well. The controlled release formula will continue feeding your turf steadily for 2–3 months through winter.

3. Manage Weeds Early

Winter weeds like winter grass (Poa annua) and broadleaf weeds thrive in the cooler months when your turf is less competitive. The best defence is a dense, healthy lawn going into winter — but if weeds do appear, treat them early before they set seed and spread.

4. Watch Your Watering

Reduce watering frequency in winter — your lawn needs far less water when it's not actively growing. Overwatering in cold weather promotes fungal disease and root rot. Water in the morning so the lawn dries before nightfall, and avoid watering before a frost.

5. Aerate If Needed

If your soil is compacted from summer foot traffic, winter is a good time to aerate. This improves drainage, reduces waterlogging, and allows nutrients and oxygen to reach the root zone. Core aeration is ideal for heavily compacted areas.

6. Overseed Cool-Season Varieties (If Applicable)

If you have a warm-season lawn like couch or kikuyu that goes dormant and brown in winter, you can overseed with a cool-season ryegrass to keep it green through the colder months. This is common on sports fields and golf courses across southern Australia.

7. Keep Off Frosted Grass

Frost-covered turf is fragile. Walking or driving on frosted grass crushes the ice crystals inside the leaf blades, causing cell damage that shows up as brown patches. Stay off the lawn until the frost has melted naturally.

Preparing for Spring

As temperatures start to rise in late August, your lawn will begin to wake up. This is the time to apply a balanced fertiliser like ProTurf NPK or a high-nitrogen formula like ProTurf N to kickstart growth and green-up. Dethatch if needed, and resume your regular mowing schedule as growth picks up.

A well-maintained winter lawn bounces back faster, looks better, and is far more resistant to the weeds and pests that come with spring.

Browse the full range of professional turf care products at OzGrass — fast delivery Australia-wide.