Thanks - The info on the Colorado Parks & Wildlife page is confusing.An OHV is an "off highway vehicle", so if you're licensed for the road you should be good. This is a way to tax things like SXS, dirt bikes, and quads which otherwise would be not taxed (e.g. no annual registration).
Colorado OHV Permit requirements:
All OHVs and motor vehicles (including motorcycles) that display a valid Colorado license plate must also display a current Colorado OHV use permit sticker when operated on designated OHV trails in Colorado.