We’re fortunate to have several tracks in and around the Denver area;
The Track @ Centennial (in southeast Denver)
IMI Motorsports (about 30 mins north of Denver)
Action Karting (west of Denver, at Bandimere Speedway)
SBR Motorsports (in Calhan, east of Colorado Springs…about 1hr 30min from Denver)
Grand Junction Motor Speedway (about 4 hours west of Denver, well worth the drive)
We also have a local forum…
There are several series here, and Rotax and Stock Honda are going to be the two most popular engines state-wide. The Track actually has one of the largest Rotax clubs in the whole USA, and they added a super economical (and fun!) Briggs LO206 class this year that’s been attracting 20+ entries every race (our season just ended yesterday). We also have a SKUSA region that is home to a few of the countries top Stock Honda pilots.
I don’t think there’s anywhere around here that would officially support a class for your ICC, but you see the occasional ‘outlaw’ class where (almost) anything goes.
Also, we’re at high altitude here, so be prepared to re-jet everything!
Denver (and Colorado in general) is great, you’ll like it here!