Halloween in Denver has always been bigger than pumpkin patches and trick-or-treating. For adults, it’s a chance to escape the everyday, dress up, and dive into a night of mystery, music, and mayhem. While the Mile High City has no shortage of haunted houses and seasonal events, one party has consistently redefined what a Halloween celebration can be: Coloween.

For nearly two decades, Coloween has grown into the largest and most iconic adult Halloween party in Colorado. From its early days in smaller venues to its evolution into a full-scale immersive experience, the event has attracted thousands of partygoers each year—cementing its place as a must-attend night for anyone looking to celebrate Halloween in Denver at the highest level.

As Coloween celebrates its 20th year, it’s making its boldest move yet by relocating to Bounce Empire, a jaw-dropping entertainment complex in Lafayette, Colorado. With more than 50 rides, attractions, and interactive experiences under one roof, Bounce Empire brings an entirely new dimension to Coloween. Together, they’re creating a Halloween experience unlike anything Denver has ever seen.

Halloween in Denver: More Than Haunted Houses

Denver has a well-earned reputation as a Halloween destination. From elaborate haunted houses like 13th Floor to neighborhood block parties and masquerade balls, the city offers something for every type of Halloween fan. But for adults looking for a mix of costumes, cocktails, and unforgettable energy, nothing compares to the Coloween experience.

While many events focus strictly on scares, Coloween has always leaned into immersive entertainment. It’s not just about ghosts and goblins—it’s about creating an alternate world where guests can step into their fantasies, dance until dawn, and connect with thousands of others doing the same. This distinction has kept Coloween ahead of the curve while other parties come and go.

The History of Coloween

Coloween began in Denver in the early 2000s as a boutique event for a few hundred people. Its founders wanted to create something different from the standard nightclub Halloween party. They envisioned a large-scale immersive event that combined the production value of a music festival with the creativity of a costume ball.

Over the years, Coloween scaled up dramatically. Past venues have included historic hotels, sprawling ballrooms, and converted warehouses. Each year, the event pushed production further: larger stages, elaborate themed environments, interactive performers, and Colorado’s most competitive costume contest.

By the mid-2010s, Coloween was drawing more than 4,000 attendees annually, making it the largest and most immersive adult Halloween party in Denver. Guests returned year after year because Coloween was more than just a party—it was a tradition. For many, it became as essential as carving pumpkins or visiting a haunted house.

Themes That Defined a Legacy

A hallmark of Coloween’s success has always been its annual theme. Every year, the event reinvents itself with a new creative concept that shapes décor, performances, and even the crowd’s costumes.

• Haunted Mansion Vibes turned Denver’s ballrooms into ghostly estates.

• Carnival of the Damned brought circus freaks, fire breathers, and sideshow thrills.

• Welcome to the Jungle (2024) transformed Coloween into a neon-drenched rainforest, complete with immersive greenery, performers, and jungle beats.

And now, for 2025, the theme is written into the venue itself: the Fun House. Bounce Empire becomes a twisted carnival of lights, slides, and surreal spaces where nothing feels ordinary. Guests aren’t just spectators — they’re part of the show.