Mark,
There’s a bunch of different series in CO.
The Colorado Junior Karting Club (CJKC) that Rick mentioned is basically a regional series. It visits 4 out of the 5 tracks in CO, plus a temporary circuit in the parking lot of the Littleton Home depot, and runs the Comer K80 engine.
The Colorado Sprint Championships (CSC) is also a regional series and visits 3 tracks. The difference is the CSC runs classes for all ages whereas the CJKC is for kids only. The CSC uses the Rotax MiniMax or Honda engines.
CRE Motorsports, near Colorado Springs, would be the closest track to you. They have a series that runs at CRE only. You can run either the Comer K80 or the Rotax MiniMax there.
The Track at Centennial and IMI do a “club series” which bounces between the two tracks. You can run the Rotax MiniMax or the Honda engine packages there.
So, there’s lots of choices. Like Greg said, give us a call at the shop and we’d be happy to go into detail on any questions you might have. 1-800-608-3457
For what it’s worth, I recently heard about a small track in Albuquerque that’s apparently running races now. I don’t remember the name of it, but it might be worth looking into.