ENEOS 150

The eNEOS 150 is a ARCA Menards Series West race first held in 1995 at Colorado National Speedway. The ARCA Menards Series West has raced at Colorado 17 times since 1995 with Chris Eggleston with three wins is the driver with the most-series wins at the track.

CNS hosted the NASCAR Craftsman Truck Series during its first three seasons, 1995 through 1997. The 1995 Total Petroleum 200 featured a last lap battle where Butch Miller edged out Mike Skinner by .001 second for his only series win. This is listed as the closest finish in series history, although the video replay of the race may dispute that measurement. The 1996 Colorado 200 saw Skinner dominate leading the final 220 laps and beat Miller by .7 seconds. Ron Hornaday, Jr. won the final race in 1997.

For the 1998 season, Colorado was dropped from the schedule in favor of Pikes Peak International Raceway in Colorado Springs, which hosted the series until 2002.