When it's cold enough, skin can freeze, resulting in frostbite. Frostbite not only is painful but can result in loss of fingers and toes, even arms and legs, so it's best to prevent frostbite in the first place. Recognize that by venturing out into the cold, you are risking frostbite. Stay mindful of the risk. Keep a close eye on the weather wherever you go into the wilderness, and adjust your plans as necessary to avoid the risk of frostbite.
Frostbite can strike in any season, especially in the high country.
Make sure you have clothing that will not lose its insulating properties when wet. Dehydration is a predisposing condition for frostbite and hypothermia. Eat plenty of food, especially carbohydrates, which are quick to digest and easy for your metabolism to turn into heat. Eat small amounts frequently rather than large amounts infrequently. Set a reasonable pace when engaging in vigorous activities.