Museums & Zoos Free Days in Denver and Colorado

Colorado has what seems like an endless supply of museums, zoos, and other attractions. Many of them have free days throughout the year, often during their off season. I track them down for you and list them here. A trip with the family to a zoo or museum is a great way to do something fun and break the day to day monotony. The most popular free days in all of Colorado are probably the Denver zoo free days, but the various museum free days are just as enjoyable.