How to Aerate and Overseed Your Lawn in Late Spring for a Dense, Healthy Turf
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Aeration and overseeding give your lawn a solid boost. People who do this say timing hinges on soil temperature, not the air. Warm-season grasses thrive when soil hits 65 to 70°F in late spring to early summer. Cool-season types prefer cooler soil between 50 and 65°F in late summer to early fall. Do this once a year for best results.
What you need
Steps
- Mow the lawn shorter than usual. Water it one to two days beforehand so the ground is workable. Mark any sprinkler heads or shallow utility lines, then clear away debris.
- Run a core (hollow-tine) aerator over the lawn to pull plugs. This loosens compaction and creates space for seeds. Core aeration works best for getting good seed-to-soil contact.
- Spread grass seed right after aerating. Getting seed into those holes immediately helps it touch the soil where it needs to grow.
- Water lightly and often to keep seeds moist. Leave the soil plugs in place. Wait to mow until new growth appears, skip weed killer, and keep foot traffic down while the grass establishes.
Why it works
Soil temperature and timing details
Soil temperature drives germination and root growth, so check that before you start. Warm-season grasses like soil between 65 and 70°F; cool-season grasses prefer 50 to 65°F. Avoiding frost, peak heat, or drought reduces stress on new grass. Sources differ slightly on exact months. LawnStarter suggests late spring to early summer generally, while Lawn Love specifies May to July for warm-season grasses. Both align on the soil temperature requirement. Aerating and overseeding once a year is sufficient for most lawns.
Related on Landscaping Bible: How to Winterize Your Lawn with Late-Fall Fertilizer, Overseeding and Aeration in October for a Thicker Spring Lawn, Mulch Leaves to Feed Your Lawn and Garden, Build a Lasagna Garden in a Raised Bed.
If it goes wrong
Professional help
Timing can be tricky. Services like LawnStarter and Lawn Love offer professional help to ensure the work happens at the right time.
