The fundamental difference between spring and autumn care is what you want from the grass. In spring you push it into growth; in autumn you're preparing it for dormancy β strengthening roots and resilience rather than leaf.
The last cut: when and how high
The final cut goes on roughly four weeks before the first sustained frosts β usually late October or November, depending on the weather. Height is what matters: leave the grass at 4β5 cm.
Why not shorter and why not longer? Grass cut short goes into winter with weakened roots and takes frost full on. Left long, it flattens under snow, sweats, and in spring you find patches of snow mould.
Autumn feed: potassium, not nitrogen
This is the classic autumn mistake β using up what's left of the spring feed. Spring mixes are rich in nitrogen, which drives leafy growth; in autumn that means soft, sappy blades that the first frost scorches.
Autumn feed therefore has a high potassium content. It doesn't push growth but firms up plant tissue and improves frost hardiness β the grass goes into winter tougher. Apply it by mid-October at the latest so the grass has time to take it up.
Leaves: clear them, but put them to use
Leaves have to come off the lawn. Under a continuous layer the grass gets no light, moisture is trapped, and within a few weeks you have a bare yellow patch that moss colonises by spring.
You don't have to cart them away, though. If the layer isn't thick, run a mulching mower over it β the shredded leaves drop between the blades of grass and break down as a feed. Thicker layers should be raked up and used as mulch on beds or added to the compost.
Overseeding and aeration
- Overseed bare patches β early September beats spring for this: the soil is warm, rainfall reliable, and weeds aren't competing so aggressively. By October it's too late, the seed won't establish.
- Scarifying β thatch removal is mainly a spring job, but a light scarify in September helps where thatch is heavy. Not in October or November, though: the lawn wouldn't recover before winter.
- Aeration β worth doing any time through autumn on compacted lawns; even just spiking the surface with a fork improves air movement to the roots.
What to avoid in autumn
- Nitrogen feed β see above: soft grass and scorched blades.
- Walking on frozen grass β frozen blades snap, and footprints show as brown marks well into spring.
- A final cut on wet grass β the mower tears rather than cuts, and damaged tissue is an open door to fungal disease.
- Leaving leaves until spring β the lawn always loses that one.
Frequently asked questions
When should I cut the lawn for the last time?
About four weeks before the first sustained frosts, typically in late October or November. Leave the grass 4β5 cm high β shorter and it enters winter with weak roots; longer and it mats under snow, inviting snow mould.
Do I really need to feed the lawn in autumn?
It isn't compulsory, but it's one of the most effective things you can do for it. A high-potassium autumn feed improves frost hardiness and the lawn comes through to spring markedly thicker. Apply it by mid-October, and never reach for the spring nitrogen feed instead.
Do I have to rake leaves off the lawn?
Yes β a continuous layer will smother the grass within weeks. A thin layer needn't be carted away though: run a mulching mower over it and the shredded leaves break down in place as a feed. Only thicker layers need removing.