pac boots are the wrong direction to be going. if you are going to South Dakota i think you said in Nov it will be cold by so cal standards but not ice station zebra. keep in mind you are walking all day so a good quality set of waterproof boots will do just fine. Good boots with a water resistant chap or pant will make hunting very comfortable.
fall back position is the hot hands toe warmer heat packs, i used them with my solomon gtx boots in a tree stand with temps hitting zero and they were comfy.
the single most important thing is that they be very very very very waterproof and you keep water from getting in the top. if your pants let melting snow down the top of your boot you will be OUT in no time. I have been wearing the same pare of Filsons chaps for like 20 years now. I keep them waxed and they work in snow or heat and no matter how wet a field is my legs stay dry