Asked April 8, 2019, 11:40 AM EDT
How often should we aerate & overseed?
Hennepin County Minnesota
There is no rule of thumb in this regard. The need for aeration and overeseeding varies depending upon soil conditions and the turf's general health.
The following information was prepared for Virginia residents but most of it also applies to Minnesota. What's said about how to know when aeration is needed is relevant to your question.
Some authorities discourage aeration in spring because weed seeds brought to the surface may germinate before the lawn recovers.
Overseeding does not benefit healthy turf. If it's needed (when thin and bare patches are present), overseeding after aeration is a good way to ensure good seed to soil contact.