Anti-freeze or drain?
yeah the correct mixture of anti freeze and purified water is best IMO. And hurry up with your garage space thing lol. And also add some fuel additive to you tank to keep moisture out of there as well. if possible also pull carb off and store it inside drained and bagged. Just suggestions not law lol! I simply go home to Florida and enjoy the sun and driving my toys all year round. Colorado is already getting to cold for me!