Denver Trick Or Treat 2025. The denver zoo’s longstanding tradition “boo at the zoo” was replaced by “wild fall” last year and it looks like the new event is still going strong in 2022. The harvest hoot offers games, crafts, the rocky mountain mini train, and a monster carnival.

The denver zoo’s longstanding tradition “boo at the zoo” was replaced by “wild fall” last year and it looks like the new event is still going strong in 2022. Find or share your towns time today.