The rules and regulationis for riding your ATV in Oregon are pretty lax compared to a lot of other States. The Department of Motor Vehicles does not issue any registration for ATVs, including permits, for all-terrain vehicles or other vehicles not manufactured for use on public roads. The Oregon Parks and Recreation Department for information about riding ATVs and purchasing permits for the purposes of riding on publicly managed lands.
It is optional in Oregon to title your ATV with DMV, but it is not required by Oregon law at the time of this writing.
The youngest a child can ride their ATV on publicly managed lands is 12-yrs of age with adult supervision. A safety course certificate is not required but is considered a good idea for anyone who allows their children to ride ATVs in the National Forest Areas and other publicly owned ATV trail riding areas.
If you are going to ride your ATV on any publicly managed lands, you need to make sure that you have your noise muffler and spark arrestor in place prior to riding on any publicly owned lands in Oregon. A DOT approved helmet and you must use a red flag if you are riding your ATV in sandy conditions and if you have a chain on your ATV, you must have a chain-guard installed.
A permit to ride your ATV must be purchased from the Forest Department prior to riding on any publicly owned lands. The fee to ride is $10 at the time of this writing. Always verify with the State Land Management Bureau what the latest rules and regulations for riding on any publicly owned lands in the State of Oregon.