Colorado is loaded with Halloween events and things to do from September through the entire month of October. The Colorado Halloween events listed here are for adults and kids. There's fun Halloween events like costume parties, masquerade balls, zombie walks runs and crawls, parades, spooky walks, haunted mines, theatre, train rides, corn mazes, boo at the zoo, haunted houses, ghost walks, trick or treat on the street, concerts and more. It's all in the name of fall and Halloween fun. See this week's Colorado Halloween events below or follow the link to below to see all upcoming Colorado Halloween events.