My rut follows yours.
I start hunting in early Sept.
I rarely see a fawn in spots, here, from stand.
I'm sure there are circumstances where a doe can be bred in any month. HIGHLY uncommon.....but not unheard of. I'd say it's WAY (understatement)more common for a this year's fawn to get BRED than it is for it to have spots in December.
I could be all wrong, though.
that would be the end of July
That would mean she was bred the END of January.