How to Aerate Your Lawn

What you'll need

• Core aerator (manual or rental)
• Garden hose
• Lawn mower
• Flags or markers

The steps

1. 1

   Water the lawn the day before

   Run your sprinklers or hose the lawn thoroughly the day before you plan to aerate. The soil should be moist but not muddy. Dry, hard soil resists the aerator tines and produces shallow or broken plugs. If it rained in the last day or two, you can skip this step.

2. 2

   Mow the lawn short

   Cut the grass shorter than usual, about half your normal mowing height. This makes it easier for the aerator tines to penetrate the soil and gives you a clear view of the ground surface. Bag the clippings so they do not interfere with the aerator.

3. 3

   Mark sprinkler heads and buried utilities

   Walk the yard and place flags or markers on every sprinkler head, valve box, shallow irrigation line, and any buried utility you know about. A core aerator will punch holes 2 to 3 inches deep. Hitting a sprinkler head or shallow pipe is an expensive mistake. Call 811 if you are unsure where utility lines run.

4. 4

   Run the aerator in two passes at right angles

   Make your first pass across the entire lawn in parallel rows, overlapping each pass slightly. Then make a second pass perpendicular to the first. Two passes at right angles ensure even coverage and break up compaction in both directions. Focus extra attention on high-traffic areas like paths and play zones.

5. 5

   Leave the soil cores on the lawn

   The small plugs of soil the aerator pulls out should stay on the surface. They break down in one to two weeks and return nutrients and microorganisms to the soil. Do not rake them up. If the appearance bothers you, run over them with a mower after a few days to break them apart faster.

6. 6

   Overseed and fertilize after aerating

   Right after aeration is the best time to overseed thin spots and apply fertilizer. The holes give seeds direct soil contact and let fertilizer reach the root zone instead of sitting on the surface. Spread seed first, then fertilizer, according to the product rates on the bag.

7. 7

   Water well for the next two weeks

   Keep the lawn consistently moist for 10 to 14 days after aerating. This helps new seed germinate and lets the soil settle around the aeration holes. Water lightly once or twice a day rather than one heavy soaking.

Frequently asked questions

What is the difference between core aeration and spike aeration?

Core aeration removes small plugs of soil, which relieves compaction by creating space for air, water, and roots. Spike aeration just pokes holes that can actually compress the soil around each hole, making compaction worse. Core aeration is the better method for almost every lawn.

How often should I aerate my lawn?

Once a year is enough for most lawns. Heavy clay soil or lawns with high foot traffic may benefit from twice a year. Sandy soil that drains well on its own may only need aeration every two to three years.

When is the best time of year to aerate?

Aerate during the active growing season for your grass type. For cool-season grasses like fescue, bluegrass, and ryegrass, that means early fall. For warm-season grasses like bermuda, zoysia, and St. Augustine, aerate in late spring or early summer. Aerating during dormancy stresses the lawn without giving it time to recover.

Can I aerate a wet lawn?

Moist soil is ideal. Soggy or waterlogged soil is not. If you can squeeze a handful of soil and water drips out, it is too wet. The aerator will clog, the tines will tear the turf instead of cutting clean plugs, and you will compact the soil further by walking and pushing equipment on it. Wait a day or two for it to dry out.

Products you'll need

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