If there is a doe that needs breeding, a buck doesn't care what time of year it is. Saw a doe that was unbred or didn't take just last week and a 4 point muley was dipping his wick. Does won't let a buck mount them if they aren't ready.
In more temperate and more gradual photoperiod environments, the deer breed throughout the course of months and not in a fast/furious week or two. Here though, I think it's most likely yearling does or does that missed a dose last month.