Cal. Unemp. Ins. Code § 704.1
(a) Notwithstanding any other provision of this division, the director may terminate any elective coverage agreement under this article if he or she finds that any of the following conditions exist:
(3) The regular trade, business, or occupation of the employing unit or self-employed individual is seasonal in its operations.
This paragraph shall not apply to any public entity.
(b) The director shall give to the employing unit, or to the self-employed individual, a written notice pursuant to Section 1206 of the director’s termination of the elective coverage agreement under this section. The date of termination may be the end of the calendar quarter immediately preceding the existence of any condition specified in subdivision (a), or the end of any subsequent calendar quarter thereafter, as determined by the director.
Any termination of elective coverage shall not affect the liability of the employing unit or self-employed individual for any contributions due, owing, and unpaid to the department.