Question...can you put Vaseline on combs and wattles to PREVENT frostbite or wait and see....
Vaseline will not PREVENT frostbite. If you have dampness in your coop and freezing temperatures, wattles and combs will freeze. The Vaseline is a simply barrier to that happening. If you do use it, try and make sure the combs/wattles are dry before you apply it, otherwise they will freeze.