Originally Posted by Glenn Lawn Care
Aerate and apply water!
Good answer Glenn.
Definitely aerate. It will allow the water to permeate deeper into the soil, and loosen up the hard compacted surface. Allowing the grass roots to grow deeper into cooler/moister soil... De-Thatching helps also but works best if done a couple months before aerating..
Not to mention this will amplify the effects of any crabgrass prevention program you my already have.