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BETTESWORTHConstruction
core aeration

How Often Should You Aerate Your Lawn—and How Many Passes Should You Make?

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There is no universal aeration schedule or fixed number of passes. Aerate according to soil compaction, traffic, turf type and growing conditions; then make enough passes to achieve roughly 20 to 40 holes per square foot, the target suggested by Iowa State University Extension.

How often should you aerate your lawn?

Use the lawn’s condition to set the schedule rather than aerating automatically every year. Compacted soil, heavy use and heavy clay generally call for more frequent core aeration than well-drained soil with little traffic. Extension recommendations differ because they address different regional conditions and lawns.

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Guidance Suggested frequency Conditions and context
Iowa State University Extension and Outreach, reviewed April 2024 Twice a year for heavy-clay or heavily used lawns; once a year for well-drained lawns with little traffic Its seasonal examples for Iowa cool-season lawns are September and April. Source
University of Maryland Extension, updated March 1, 2023 Every 1–2 years for lawns with heavy foot traffic; every 2–4 years for other home lawns Recommendations are for home lawns; aerate during active growth. Source
University of Nebraska–Lincoln Extension, April 19, 2022 At least once a year for compacted areas; twice a year may help with severe compaction Timing depends on whether the turf is cool-season or warm-season. Source
University of California Statewide IPM Program Several times a year may be appropriate for heavy clay or high-traffic lawns; little-activity lawns may not need aeration Frequency depends on soil, use and the appearance expected; aerate during active growth. Source

These are regional extension recommendations, not a single national standard. Compare your lawn’s soil, compaction, traffic and grass growth season with the conditions each recommendation describes.

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How can you tell whether your lawn needs aeration?

Look for persistent puddling or runoff, hard soil, or thin, worn paths where people, pets or equipment repeatedly travel. Heavy clay and frequent traffic increase the likelihood of compaction. Aeration is intended to relieve that compaction, so a lawn with loose, well-drained soil and little use may need it less often—or not at all, according to UC IPM.

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How many aerator passes are best?

There is no reliable pass count that suits every machine and lawn. Iowa State Extension suggests a density of about 20 to 40 holes per square foot for a properly aerated lawn. Because many machines do not make enough holes in one pass, several passes are often necessary. Check the plug spacing as you work and add passes where coverage falls short of that density. The number required depends on the equipment and its spacing, not on a universal rule.

Choose a core aerator, not a spike tool

A core aerator uses hollow tines to remove small soil plugs. Iowa State recommends core aeration, and Maryland Extension cautions that solid-tined equipment can add compaction. Spike tools are therefore not equivalent to plug-removing core aerators.

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For a small lawn, a manual core aerator may be practical; for a larger area, consider a machine or a lawn-care service. Iowa State notes that rental agencies often carry core aerators. Whichever option you use, confirm it removes cores rather than simply puncturing the soil.

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When and how should you aerate?

Choose a period of active growth

Aerate when the desirable grass is actively growing so it can recover. For cool-season lawns in Iowa, Iowa State lists September and April as favorable windows. Maryland Extension recommends fall for cool-season turf and June through July for warm-season lawns. These are regional examples, not dates that apply everywhere; local grass type and growing season matter. Avoid aerating dormant turf.

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Check soil moisture before starting

The soil should be moist enough for the tines to penetrate, but not saturated. Dry soil can limit penetration, while wet soil can plug the tines, Iowa State Extension warns. If the ground is too dry or wet, wait for more suitable conditions.

Work methodically and check coverage

  1. Identify compacted areas from puddling, hard soil or concentrated wear, and consider whether heavy clay or recurring traffic is contributing.

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  2. Use a hollow-tine core aerator sized for the lawn; do not substitute a solid-spike tool if the goal is to remove cores.

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  3. Make passes across the area, checking the hole pattern and spacing. Add passes where needed to approach Iowa State Extension’s suggested 20 to 40 holes per square foot.

  4. Stop when the area has adequate coverage; there is no fixed pass count independent of the machine and its plug spacing.

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