Halloween Events 2025. There's a ton of halloween events & activities to attend in denver this year. October 3, 10, 17, 30, 2025.

From 12th october to 3rd november, to celebrate the 25th anniversary of halloween, walibi becomes ibilaw, a world of horror and vengeance. Carve the spookiest pumpkin, follow ghoulish trails and settle down for a ghost story or two.