C.R.S. § 42-12-402

A collector may store one or more motor vehicles or motor vehicle parts on the collector’s property if the vehicle, motor vehicle part, and storage area are maintained so as to not constitute a health hazard, a safety hazard, or a fire hazard; are screened from ordinary public view by means of a solid fence, trees, shrubbery, or other appropriate means; and are kept free of weeds, trash, and objectionable items.