For most years we try to be done with aerification by April 15 and October 15. The reason for this is our grass needs to be actively growing for it to heal quickly. If we get frost the grass almost stops growing completely leaving the holes open for long periods of time. One season it lasted from October through April without the ability to grow over the holes. (We did not do a spring aerification.) They were filled with sand but the grass did not cover the holes. On other seasons the holes were closed in 7 days, recovery just depends on the weather and growing conditions.
Spring: Skipped due to mechanical issues with one aerifier. We may spot aerify locations throughout the season.
Fall: Not determined at this time 2015 was October 7, 8, 9 Punching holes… Filling in the holes (October 12-16)
Tees: Before Memorial day and After Labor day (Will have no affect on play)
Fairways: Mid March-May when weather is co-operative. Fall Mid October through November