Lawn Care Calendar UK – DIY Guide
A UK lawn care calendar tells you exactly what to do each month — from winter rest and early spring feeding through to autumn scarifying and aeration. Follow the seasonal schedule and your lawn stays green, thick, and healthy all year without guesswork.
Kick Off Spring Recovery (March–April)
Once soil temperature reaches around 7–8 °C consistently — usually mid-March in the south, early April further north — the grass begins active growth. Give the lawn its first mow of the year with blades set high (40–50 mm), removing no more than one-third of the leaf length. Apply a spring lawn fertiliser with a higher nitrogen content to kickstart growth, using a spreader for even coverage. If moss has built up over winter, apply an iron sulphate-based moss killer and allow it to blacken before raking out. Bare or thin patches respond well to overseeding at this time — our guide on how to seed a bare lawn covers everything you need.
Feed, Weed, and Maintain Through Early Summer (May–June)
Increase mowing frequency to once or twice a week as growth accelerates, lowering blades gradually to your target cutting height — 25–35 mm for a family lawn, 10–15 mm for a fine ornamental lawn. Apply a combined feed and selective weedkiller in May when weeds are actively growing and soil is moist — never when rain is forecast within 48 hours. If you prefer to treat weeds separately, our full walkthrough on how to feed and weed a lawn explains timing and application in detail. Edge the lawn monthly with a half-moon iron for clean definition.
Water and Watch Through High Summer (July–August)
Raise your mowing height slightly in hot, dry spells — longer grass shades the soil and retains moisture more effectively. Water deeply and infrequently: 20–25 mm once or twice per week is more beneficial than light daily watering, which encourages shallow roots. Early morning is the best time to water, reducing evaporation and fungal risk. If the lawn turns straw-coloured in a drought, do not panic — established lawns recover quickly once rain returns. Avoid applying nitrogen-heavy fertilisers in peak summer heat as this stresses drought-weakened turf.
Renovate in Autumn (September–October)
Autumn is the single most important maintenance window for UK lawns. Scarify first to remove the thatch layer — dead grass and organic debris that blocks air and water — then aerate with hollow tines or a garden fork pushed 100–150 mm deep at 150 mm intervals. Brush a mixture of topdressing compost and sharp sand into the aeration holes to improve drainage and root depth. Apply an autumn fertiliser with low nitrogen and higher potassium and phosphorus to harden the grass ahead of winter. Overseed thin areas immediately after scarifying while the soil is still warm; address any drainage issues before the ground closes in.
Prepare for Winter Rest (November)
Lower your final mow of the year to around 30–35 mm — not shorter, as very short grass is more vulnerable to frost and disease. Clear fallen leaves regularly using a rake or leaf blower; a thick leaf layer smothers grass and creates ideal conditions for fungal disease. Apply a final autumn fertiliser if not already done in October. Clean and store your mower with fuel stabiliser or drained carburettor, and store fertilisers in a cool, dry place away from frost. Your lawn is now ready to rest until temperatures rise again in spring.
Frequently Asked Questions
When should I do my first mow of the year in the UK?
When soil temperature consistently reaches 7–8 °C and the grass is visibly growing — typically mid-March in southern England and early to mid-April in Scotland and northern England. Check the forecast and avoid mowing if frost is expected within 48 hours.
How often should I water my lawn in summer?
Water deeply once or twice a week rather than lightly every day — aim for 20–25 mm per session to encourage deep root growth. Early morning watering reduces evaporation loss and lowers the risk of fungal problems caused by grass sitting wet overnight.
Do I need to scarify every year?
Most UK lawns benefit from annual scarifying in September or October to remove thatch. If your lawn feels spongy underfoot or drains poorly, thatch is the likely culprit and scarifying will make an immediate difference to grass density and colour.
Can I repair bare patches at any time of year?
The best windows for overseeding are mid-spring (April) and early autumn (September) when soil is warm and moisture is reliable. Avoid midsummer heat and mid-winter frosts — seed will fail to germinate in either extreme. Our guide on how to seed a bare lawn covers the full process.
What is the difference between spring and autumn lawn fertiliser?
Spring feeds are high in nitrogen to push green leafy growth as the lawn wakes up. Autumn feeds contain lower nitrogen and more potassium and phosphorus, which harden the grass, strengthen roots, and improve cold and disease resistance heading into winter. Using the wrong feed in the wrong season actively damages your lawn.
Soil temperature is a far more reliable trigger for lawn tasks than the calendar date — a cheap soil thermometer takes the guesswork out of when to start feeding and overseeding. In the UK, the same date can mean frozen ground in Yorkshire and actively growing grass in Cornwall.
Sources
- RHS — Lawn Care Through the Year — rhs.org.uk
- Which? — How to Care for Your Lawn — which.co.uk
- RHS — Lawn Feeding — rhs.org.uk
This guide is for general information only. Always work safely and follow manufacturer instructions. DIYnut accepts no liability for injury or damage arising from DIY work.
