When soil becomes compacted, it can be harder for water and creatures to get through, which in turn can stunt grass growth. Aeration gives the grass easier access to air and water and allows for deeper and stronger root growth. Lawn care service providers aerate a lawn by using lawn care equipment called a core aerator that pulls plugs of soil out of compacted soil to loosen it up and stimulate growth.
Soil aeration is recommended at least once a year. The timing of that annual aeration varies depending on the type of grass and climate. For example:
Early SPRING or FALL are the best times to aerate cool season grasses.
SUMMER is the ideal time for aerating warm season grasses.
The key is to aerate during active growth times. Aerating before overseeding can improve the effectiveness of the overseeding efforts.