To prevent water pipes from freezing in cold weather, insulate your pipes, especially those in unheated areas like crawl spaces, garages, and attics. Keep cabinet doors open to allow warm air to circulate around the pipes. Let faucets drip slightly when temperatures are below freezing to keep water moving. Seal any gaps or cracks in walls and windows to prevent cold air from entering. Consider installing heat tape or a pipe heating system for added protection. Regularly check and maintain your pipes to catch any potential issues early.