Blacktails in this area will typically start the pre-rut towards the end of Oct. Mature bucks are the first to do so. Once a doe is ready to be bred she will stay in heat for about 24 hrs. If she is not bred and as many as 40% aren't she will come back into heat in 27-28 days later for a second rut. The bucks in my area were going crazy the last weekend of elk season, and then had cooled off by late buck.