enver has seen its share of high-profile events over the years. There have been NCAA basketball championships, an MLB All-Star Game and more than a few final stages of major cycling tours.

But the 60-foot wall of ice in Civic Center Park that served as the venue of a major international ice climbing competition February 23–24 was a first. And it wasn’t just a first for Denver: It was a first for North America.

Denver played host to the final stop on the Ice Climbing World Cup tour. Athletes in the International Climbing and Mountaineering Federation (UIAA) event competed in two disciplines at the doorstep of the Colorado State Capitol and Denver city government headquarters, while a winter festival that featured axe throwing, an ice maze and human curling entertained visitors at the free event.

A free winter festival near the climbing walls kept fans and spectators entertained. The event included a human curling demonstration that was a hit with kids. Photograph: Jason Gewirtz

The American Alpine Club, based in nearby Golden, Colorado, served as the local organizing committee. The AAC is the UIAA’s recognized U.S. federation for ice sports in the United States and saw the event as an opportunity to increase exposure to new people. “The sport is gaining popularity but not with the general public,” said Vickie Hormuth, the AAC’s director of strategic partnerships. “Part of the reason to bring it to Denver was to introduce the sport to an entirely new demographic.”

The United States has hosted three other World Cup events on the tour in the past few years, including two in Bozeman, Montana, and one in Durango, Colorado. The finals, however, had never previously been staged in North America. The AAC did not organize those previous events, turning them instead over to local clubs. But the organization, which was founded in 1902, made it clear to UIAA that it intended to organize this event in Denver. To back its effort, the club reached out to Visit Denver, the Denver Sports Commission and the city of Denver, which provided their backing as well. “Part of our application process was letting the UIAA know that we wanted to run this event ourselves,” Hormuth said. “We are really interested in growing the audience for this sport.”

The American Alpine Club based in Golden, Colorado, served as the local organizing committee. Photograph: Jason Gewirtz

The event comes at a key time for the sport of climbing. The traditional form of the sport will be on the program at the 2020 Olympic Summer Games in Tokyo and Hormuth said there is hope interest in that version will translate into interest in ice climbing as well. UIAA is also working to get ice climbing on the program for the 2026 Winter Games in Beijing. “Part of what we want to do is gain visibility for the sport in general but also so we can gain visibility for people who may want to join the USA climbing team,” Hormuth said.

As for the 60-foot walls built for the Denver competition, there was a first there, too.

Competitors faced off in the sport’s two disciplines: speed and lead. Speed is pretty much what you would imagine, with the goal to be the fastest to the top of the wall of ice using ropes fastened to the top of the wall. The lead discipline, however, was not performed on ice, although it required athletes to use the same tools of ice climbing to ascend. Lead is a more technical discipline where climbers use crampons with spikes to gain footing as they ascend the wall using specialized ice tools that they can hook into holds as they go. The discipline requires balance and precision with participants being awarded points for how far they advance in seven and a half minutes. Once up the wall, they also have to navigate cubes and other shapes before ascending to the very top of the structure. The plywood surfaces allowed organizers to build an even more technical course than they could have on ice.

Lead climbing required athletes to use ice climbing tools to navigate a series of different-shaped objects before making it to the top. Photograph: Jason Gewirtz

For the speed discipline, though, an ice wall like the one used in Denver had never previously been built in the United States. While the temperatures in Denver are cold in the winter, they were not cold enough to spray a standing wall with water to make it freeze. So instead, a technique was used to “grow” ice on the ground using a frame to surround the shape, similar to how a hockey rink is frozen. Coils were placed within the structure with cooling liquid, powered by a chiller. The structure was then lifted from the ground to the air to form a vertical wall. From there a slow drip of water kept the freeze going, 24 hours a day for three days. To be safe, the climbing surface faced north to keep the coldest possible conditions.

For speed climbing, organizers used a special technique to grow ice on the ground and lift it to create a vertical wall for competition. Photograph: UIAA/Levi Harrell

Hormuth said the AAC is hopeful the formula used for the competition will be successful. “I think we could continue it here,” she said of the downtown Denver location, which drew an estimated 12,000 people on its first day of competition. “But you never know down the line. Once we understand how we can make this easy to put on, it could be cool to tour around the United States.”

Organizers said 12,000 people attended the first day of competition, which may have been a record for ice climbing attendance. Photograph: Jason Gewirtz