Melbourne summer can push residential lawns hard. Stretches of 38 to 42 degree days, low rainfall, strong northerly winds, and water restrictions all combine to create conditions that stress warm-season lawns even when they are in good condition going into the season. The good news is that most summer lawn damage is preventable with a few decisions made before and during the hot period. This guide covers what to do before, during, and after Melbourne's extreme heat to keep your lawn in the best possible shape. For advice on recovering a lawn that has already been through a rough summer, see our guide on reviving a neglected Melbourne lawn.
What to do before Melbourne summer arrives
Aerate and top-dress in spring
A lawn entering summer with compacted soil will struggle significantly in heat and dry conditions. Core aeration in late spring (September to October) opens up the soil profile and allows water to penetrate more deeply rather than running off. A follow-up top-dressing with a sandy loam mix improves long-term drainage. Lawns that have been aerated before summer consistently perform better in extreme heat than those that have not. See our guide on lawn aeration and top-dressing in Melbourne for how it works.
Raise the mowing height before the heat arrives
Longer grass shades the soil surface, reduces moisture loss, and keeps the root zone cooler. Before the first serious summer heat, raise the mowing height to the upper end of your grass type's recommended range. For buffalo grass, that means 50 mm or above. For couch, 30 mm. The extra length makes a measurable difference to soil temperature and moisture retention during extreme heat events.
Apply a slow-release fertiliser in early spring
A lawn that has been fed going into summer has the energy reserves to cope with heat stress better than a nutrient-depleted one. Apply a balanced slow-release fertiliser in September or October. Avoid high-nitrogen fertilisers in the lead-up to and during summer heat — they push lush soft growth that scorches badly in extreme conditions.
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What to do during Melbourne summer heat
Watering: deep and infrequent, not shallow and daily
The most common watering mistake in Melbourne summer is shallow, frequent watering. Daily light watering keeps the surface moist but encourages roots to stay near the surface where they are most vulnerable to heat. Deep, infrequent watering — 2 to 3 times per week, watering enough to penetrate 15 to 20 cm into the soil — encourages deep root development and builds genuine drought resilience.
Water in the early morning where possible (before 9 am under Melbourne's typical water restrictions). Evening watering leaves the lawn wet overnight, which is a risk factor for fungal disease in warm conditions.
Do not mow in the peak heat
Mowing is a stress event for grass — it removes leaf material, creates wound sites on every blade, and forces the plant to redirect energy into regrowth. In extreme heat, this added stress on an already-stressed plant can cause visible deterioration. Avoid mowing on days forecast above 35 degrees. If the lawn needs mowing and a hot spell is forecast, mow in the morning or wait until the heat breaks.
Leave clippings on in dry conditions
During Melbourne's dry summer periods, mulch mowing — returning the clippings to the lawn — provides a light surface mulch that helps retain soil moisture. In dry conditions, this is more useful than catching and removing the clippings. For the full context on this decision, see our guide on whether to catch or mulch lawn clippings.
After a Melbourne heatwave: what to do
After a significant heat event, assess the lawn carefully. Brown or straw-coloured patches are normal and often indicate dormancy rather than death — the tug test applies here (see our guide on fixing dead patches). Resume watering as soon as possible. Do not fertilise immediately after a heatwave — the lawn needs to recover its stability before being pushed into growth. Give it 2 to 3 weeks and resume feeding once it is showing signs of recovery.
FAQ: Protecting your lawn in Melbourne summer
How often should I water my lawn in Melbourne summer?
Under Melbourne Water restrictions (always check the current rules at melbournewater.com.au), residential watering is typically permitted on alternate days before 10 am or after 4 pm. Watering 2 to 3 times per week, deeply enough to reach 15 to 20 cm below the surface, is more effective than daily shallow watering.
What lawn grass survives Melbourne summer best?
Buffalo grass (particularly Sir Walter variety) is widely regarded as Melbourne's best all-rounder for heat and drought tolerance. Couch grass is very drought-hardy once established. For a full comparison, see our guide on the best grass types for Melbourne lawns.
Should I fertilise my lawn in summer in Melbourne?
Light applications of a slow-release, balanced fertiliser in early summer (November) support growth through the season. Avoid fertilising during extreme heat — stressed grass cannot use fertiliser efficiently and nitrogen burn is a real risk in hot, dry conditions. Resume feeding in late February as temperatures begin to ease.
Is it normal for a Melbourne lawn to go brown in summer?
Yes, for some grass types. Couch and some buffalo varieties enter partial dormancy during extreme heat and drought, turning straw-brown. This is a survival mechanism, not death. The lawn typically recovers quickly once watering resumes and temperatures drop. If patches remain brown well into autumn, investigate further.
