Yellowing lawn
A lawn that turns yellow or pale is telling you something: hunger, too much or too little water, mowing too low, pests, or simply winter dormancy.
Also called: Yellow lawn, Lawn going yellow, Pale lawn
Short answer
A yellow lawn can mean hunger, too much or too little water, mowing too low, shade, pests such as lawn grubs, disease, or simply winter dormancy. Check the season and soil moisture first, then mowing height and the roots. Feed at the label rate only if the lawn is actively growing and nothing else explains the colour.
Overview
Yellowing has many causes, and the right fix depends on which one you have. Work through the checks below before buying anything: a lawn that’s yellow because it’s waterlogged won’t be helped by more fertiliser.
Symptoms
- Leaves turning pale green to yellow, across the lawn or in patches
Possible causes
- Hunger: the lawn needs feeding (nitrogen is the usual one)
- Waterlogged soil or poor drainage, which starves roots of air
- Mowing too low (scalping)
- Armyworm or lawn grubs damaging leaves or roots
- Dry, water-repellent soil
- Warm-season grasses going dormant as weather cools
Work out the cause
Think about when you last fed the lawn. A lawn that hasn't been fed in the growing season often pales off first.
Check soil moisture a few centimetres down. Soggy days after watering points to drainage; dry points to watering or water repellence.
Look at the mowing height. Did yellowing start after a low mow?
Look for caterpillars at dusk, and lift turf in patches to check for grubs.
In autumn and winter, some yellowing of warm-season grasses is normal.
How to fix it
- Feed at the label rate while the lawn is actively growing.
- Improve drainage and water deeply and less often.
- Raise the mowing height and follow the one-third rule.
- Treat pests only once you've confirmed them.
Popular questions about yellowing lawn
Guides
- application guideHow to apply granular lawn fertiliser
- application guideApplying liquid fertiliser
- GuideThe complete guide to buffalo lawns
- GuideGrowing grass in shade: what works, what doesn't and what to do instead
- irrigation guideHow much water does a lawn need?
- GuideLawn care for pet owners: urine patches, wear and safe products
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Sources
- Healthy Lawns: cutting off one-third of the grass blade, UC Statewide IPM Program, University of CaliforniaThe one-third mowing rule. Accessed 4 October 2026.