For cool season grass varieties, such as bluegrass and fescue, the fall is the most preferred time of the year to aerate a lawn, beginning in early September all the way up until the ground freezes. In the spring, prior to a pre-emergent application, is another excellent time of year to aerate. You want to avoid any other times of the year as the holes created by an aerator will break down a pre-emergent barrier, applied in early spring, allowing weeds to germinate. As for warm season grass varieties such as zoysia or bermuda grass, June is the ideal time to aerate a lawn as this is the peak growing time of the year for these type of grasses.
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