I also have to ask what your boots are made of, but if they are leather, i would highly suggest Snow Seal. i have tried it all, ok, almost all, i havent used Bear fat, and it works the best. googel snow seal and you will get the company and its adds.
I would also suggest that your feet, and what you wear on them, can make or break your outdoor expierences. i spend all day on my feet for work and then spend most of my spare time hiking, hunting, or any other outdoor thing i can find time for. i am not sure of the current count but i own between 40 and 50 pairs of boots, (boots use to be a nickname i aquired in one of my offices) everything from light hikers to winter pack boots.
lets say you bought one pair of boots for early season; warmish weather, one for midseason; say a 600 gram insulation equivalent and a late season boot (pac style) it would be one of the best investments you could possible expense. ok, so most of you are thinking, thats a lot of money in boots, and i agree. i most often use a pair of Cabela's Mountain Hunters with 400 grams of insulation. i sweat a little in the warm weather and use artic shield over boots in the cold.
all of this said, a good pair of insulated rubber boots are fantatic for all seasons when it comes to whitetail hunting.
man, my fingers hurt from all that typing. good luck.