MORRISON, Colo. (CBS4) – It’s the first-of-its-kind and concert organizers hope it becomes a tradition — the “Winter on the Rocks” concert.

It was the first-ever winter show at Red Rocks. More than 9,000 tickets were sold.

“I think it’s kind of crazy, actually, but it’s fun,” concert goer Kristin Paulis said.

Heaters were used on stage to keep the performers warm and the instruments in tune. Port-a-potties were brought in to make of for the restrooms that are shut down until spring.

Costs for a winter concert are 20 to 25 percent higher than a similar summertime show.

“I can’t believe it’s taken them this long to do this,” a concert goer said.

The credit for the winter concert goes to music promoter Chuck Morris.

“We’ve been sold out since last Monday,” Morris said.

A Denver-based ski company and Sam Warren with Icelantic also deserve credit for the concert. Icelantic is part of the Snow Sports Trade Show in its third year at the Colorado Convention Center. It’s not open to the public, but it attracts about 20,000 people.

“I grew up in Evergreen, Colorado, graduated high school on the stage at Red Rocks,” Warren said. “Being able to open this up and create history here has been a dream come true.”

Along with the cold beer there was hot chocolate with marshmallow vodka. Despite the cold temperatures, people seemed quite prepared.

“We will evaluate it after this is all over, but I’d bet the farm we’re going to have another one,” Morris said.

Red Rocks is open all year long as a park, but does typically close down in the winter for concerts. There only concern was that if there was a big snow storm on or the day before or concert day. It would have made it hard for crews to get the equipment into the venue.