South of Fort Collins near Milliken, the Two Rivers Racing area has a motocross track and a peewee 50cc track. The motocross track is known as one of the more technical tracks around with large doubles and triples.
Directions: Half way between Cheyenne WY (I-80) and Denver, CO (I-70), ON I-25 North of Denver, take Exit 252, go east 5 miles on Hiway 60 (thru Johnstown, CO) to County Rd 19, turn right and go 1/2 mile+. Track is on the right. All paved roads coming in. Graveled, level parking lot.
Note: Colorado residents must register their off-highway vehicle with the Colorado State Parks (303) 866-3437. Non-residents are not required to register in Colorado, if they are registered in their home states. All off-highway vehicles must have an approved muffler and spark arrester. These requirements are subject to change so make sure to contact the Colorado State Parks prior to using your off-highway vehicle.
Overall, Two Rivers Motocross Track is the 71st most popular dirt bike trail of all 93 dirt biking rides in Colorado.