Sometimes you can go to Nov 10th or so and some years you can be frosted on Oct 1. If you are out in the sticks you will never see end of October. But there hasn't been a killing frost in the southern part of central pa before Oct 20th in 10 years.
Stick to 56 to 80 day (8-10 week) finishers. I think the 60 day mark outside in central Pa is Oct 1 so Oct 5 is 9 weeks (64 days) and Oct 12 is 10 weeks/70 days. Yeah I know Oct 19 is 11 weeks but you usually need some extra time. Especially if a cold, wet Oct comes along.
Good luck and stay out of my spots whoever you are. LOL!