Why Mowing Timing Matters
Most people mow their lawn when it looks too long. That's a reasonable instinct, but there's more to it than length alone. Mowing at the wrong time of year — or too frequently, or too short — stresses the grass, weakens the root system, and invites weeds and disease to take hold.
Understanding the seasonal rhythm of your lawn lets you work with the grass rather than against it.
Spring: Start Gently
As temperatures begin to climb and grass starts actively growing again, resist the urge to dive straight in with the mower. The soil is often still soft and wet from winter, and heavy mowing machinery can compact and damage it.
- Wait until grass reaches around 5–7cm before the first cut of the year.
- Set your mower blade high for the first few cuts — aim to remove no more than one-third of the blade length at a time.
- Check for moss and thatch before mowing; scarifying in early spring can help the lawn breathe.
- Early spring is also a good time to overseed bare patches.
Summer: Regular Maintenance Mode
Summer is peak growing season for most grass varieties, and regular mowing keeps the lawn looking its best. However, summer also brings heat stress risks.
- Mow once or twice a week during vigorous growth periods.
- Raise your blade height during dry spells. Longer grass shades the soil, retains moisture, and copes with heat far better than a closely cropped lawn.
- Avoid mowing during the hottest part of the day — early morning or evening is preferable.
- Leave grass clippings on the lawn during dry weather; they act as a natural mulch and return nutrients to the soil.
Autumn: Slow Down and Prepare
As temperatures drop, grass growth slows. Autumn mowing is about transition — keeping the lawn tidy while preparing it for winter dormancy.
- Gradually reduce mowing frequency from weekly to fortnightly.
- Begin raising the blade height to leave grass slightly longer heading into winter.
- Clear fallen leaves promptly — a thick layer left on the lawn blocks light and encourages disease.
- Late autumn is an excellent time for aeration and top-dressing to improve drainage.
Winter: Hands Off (Mostly)
In most temperate climates, lawn mowing stops entirely during winter. Grass is either dormant or growing so slowly that cutting is unnecessary and potentially harmful.
- Avoid walking on frost-covered grass — the frozen blades break easily and leave lasting bare patches.
- If you get an unusually mild spell and the grass has grown noticeably, a single light trim on a dry day is fine.
- Use winter to service your mower — clean the deck, sharpen the blade, and change the oil.
The One-Third Rule: Always Apply It
Whatever the season, follow the one-third rule: never remove more than one-third of the grass blade in a single cut. Cutting too aggressively scalps the lawn, stresses the plant, and allows weeds to establish in weakened areas.
Ideal Mowing Heights by Season
| Season | Recommended Height | Frequency |
|---|---|---|
| Early Spring | 4–5cm | Every 2 weeks |
| Late Spring / Summer | 3–4cm | Weekly or twice weekly |
| Hot dry spells | 5–6cm | Reduce as needed |
| Autumn | 4–5cm | Fortnightly |
| Winter | 5cm+ | Rarely or not at all |
Final Tip: Keep Your Blade Sharp
A blunt mower blade tears grass rather than cutting it cleanly. Torn grass is more susceptible to disease and takes on a dull, yellowish hue. Sharpen your mower blade at least once a season — ideally at the start of spring — for cleaner cuts and a healthier lawn.