is this too early?

So we normally close the pool between Oct 10-15. We are in Michigan. This year the pool store (they close our pool) messed up and didn't schedule my closing so they have me now scheduled close to November. this is unacceptable as I have a 100 year old oak tree that hangs over my pool and the leaves and upkeep are unbearable beyond Oct 15. they have an opening on Oct 3. I realize it's only a week earlier than we'd normally close but it is unseasonable cold right now. the weather next week looks to be warmer - 66-67, and up to possibly 69 on Oct 11. Am I ok closing? I use a tarp cover. my water is currently 65 degrees, but I just turned the heater way down in case it's periodically coming on.