As of current information, two Colorado municipalities enforce breed-specific bans on pit bulls (typically defined as American Pit Bull Terriers, American Staffordshire Terriers, Staffordshire Bull Terriers, and mixes):
Other cities may have restrictions (mandatory sterilization, microchipping, liability insurance) rather than outright bans. State law prohibits breed-specific legislation for dogs unless it was enacted before 2004 (grandfathered). Always verify with local animal control for the latest ordinances.