When I lived on Long Island, the golf courses taylored their conditioning from Memorial day to Labor Day, that's when the Hamptons were the busiest. All aerification took place before and after those holidays. As with a lot of courses in the north, in many cases, aerification takes place in the fall. I would certainly check before committing to play, BUT there are some great courses on the east end that I wouldnt pass up playing even if theyre were aerified.