Kentucky Bluegrass Aeration Guide
Core aerate in early fall (late August through September) — this is the BEST time because KBG is entering peak growth and will recover quickly. Use a core-pulling aerator, NOT a spike aerator. Pull cores 2-3 inches deep, spaced 3-4 inches apart. Leave cores on the lawn to break down. Aeration is ESSENTIAL for KBG because its rhizome growth creates significant thatch buildup over time. Compacted soil restricts rhizome spread and reduces self-repair ability. Pair aeration with overseeding — seeds fall into the holes for ideal soil contact. Follow immediately with a fall fertilizer application. KBG lawns on clay soil should aerate annually. Sandy soil lawns can go every 2-3 years.
Frequently Asked Questions
Why is aeration especially important for KBG?
KBG's rhizomes create significant thatch. Core aeration breaks through this layer, improves water penetration, and brings soil cores to the surface that help decompose thatch naturally.
When should I aerate KBG?
Early September, before overseeding. Make two passes in perpendicular directions for best results. The holes provide perfect seed-to-soil contact for KBG overseeding.
How often should I aerate KBG?
Annually for most KBG lawns. KBG's rhizome growth creates more thatch than fescue, so consistent annual aeration is more important. Clay soils may benefit from twice-yearly aeration.
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