After months of regular use through spring and summer, the soil beneath a lawn often becomes compacted, particularly across paths worn by frequent footsteps or areas where furniture has stood for weeks at a time. Compacted soil holds less air and drains less freely, which gradually weakens the grass above it, even when watering and feeding continue as normal. Aerating the lawn in late summer helps loosen the soil again, right when the grass still has time to recover before the colder months arrive.
How to aerate effectively
A garden fork pushed straight down into the lawn at regular intervals across the whole area is often enough for a smaller garden, creating channels that let air, water and nutrients reach the roots more easily. For larger lawns, a hollow-tine aerator removes small plugs of soil rather than simply pushing the fork in, which relieves compaction more thoroughly across a wider area. Either method works best on soil that is neither bone dry nor waterlogged, so choosing a day after light rain often gives the best results.
Once the lawn has been aerated, brushing a thin layer of sharp sand or fine soil into the holes helps keep them open for longer, rather than letting the surrounding soil simply close back over them within a few days. This light top-dressing also helps level out any minor unevenness that has built up across the lawn over the summer months.
Areas that see the heaviest use, such as paths worn between the patio and the shed, usually benefit from extra attention during aerating, since compaction tends to be worst exactly where feet pass most often. Giving these spots a slightly denser pattern of holes helps them recover more evenly alongside the rest of the lawn.
With the soil loosened before autumn properly sets in, the lawn has a much better chance to build strong roots ahead of the colder, wetter months to come. A single aerating session in late summer often makes a noticeable difference to how the whole lawn copes with the seasons ahead.
