I am from Colorado and I am in law enforcement. Anything registered as an Off Highway Vehicle is not allowed on the roads in Colorado. This obviously includes paved roads but also gravel county roads posted as NO OHV.
The UTV is fine on the trails as long as the area is not posted as 50 inch wide or less. My prime hunting area is 50 inch or less so I am limited to an ATV.
Colorado requires an OHV permit for out of state OHVs.
Check before you head out to see what restrictions the area has in place.
http://www.staythetrail.org/index.php?option=com_k2&view=itemlist&layout=category&task=category&id=6&Itemid=155
