West of Denver and northeast of Morrison, the Thunder Valley MX has a motocross track spread over 130 acres.
To reach Thunder Valley Motocross from the north, follow I-25 South, to I-70 West, to Colfax Exit,
Colfax West to Rooney Road, turn Left (South) 1/2 mile to track.
To reach Thunder Valley Motocross from the south, follow I-25 North, to E-470, to Morrison Road West to Rooney Road, Right (North) on Rooney Road 1 mile to Track.
Overall, Thunder Valley Motocross Park is the 77th most popular dirt bike trail of all 93 dirt biking rides in Colorado.