I'm in North East Adams County(IL) and Tuesday(Oct. 18) night my 8yr old and I sat in a ground blind watching a cut corn field with LOTS of volunteer corn coming up and saw 19 deer. 2 were 2.5yr old bucks that chased some does out of a draw then started fighting each other rather seriously!! Not just tinkling the horns but all out fighting...So yes I would say this cold snap has some pre-rut activity starting!!