Many paintballers hang up their gear for the winter, but some of the more hardcore fans play all year long.  Playing in the cold, however will require you to use certain paintball equipment.  CO2 tanks tend to freeze up after shooting your marker repetitively; this causes inconsistencies in the temperature of the gas, making your paintball gun’s shooting less reliable. CO2 tanks will freeze up much faster in cold temperatures; so a better choice is to use High Pressure Air (HPA) tanks for winter-time paintballing.  HPA tanks deliver the same temperature air more consistently and your marker will shoot better.  When playing paintball in winter, it’s also important to use ‘winter formula’ paintballs.  These are made by a company called Karnage and make a huge difference in being able to play in the cold. Regular paintballs get warped, become harder to break and may fly inconsistently in cold weather.  Winter formula paintballs act like regular paintballs in normal temperatures.  Playing in winter will force you to dress warmer and heavier too - this will give you more protection for when you get hit.