California Code, Vehicle Code - VEH § 38020

Except as otherwise provided in this division, a person shall not operate or leave standing an off-highway motor vehicle subject to identification under this code that is not registered under the provisions of Division 3 (commencing with Section 4000), unless it is identified under the provisions of this chapter. A violation of this section is an infraction. Riding in violation of seasons established by Section 2412(f) and 2415 of Title 13 of the California Code of Regulations constitutes a violation of this section. This section shall not apply to the operation, transportation, or leaving standing of an off-highway vehicle pursuant to a valid special permit.