20 C.F.R. § 655.6 : Employees' Benefits — EMPLOYMENT AND TRAINING ADMINISTRATION, DEPARTMENT OF LABOR — TEMPORARY EMPLOYMENT OF FOREIGN WORKERS IN THE UNITED STATES — LABOR CERTIFICATION PROCESS FOR TEMPORARY NON-AGRICULTURAL EMPLOYMENT IN THE UNITED STATES (H-2B WORKERS) — Temporary need

(a) An employer seeking certification under this subpart must establish that its need for non-agricultural services or labor is temporary, regardless of whether the underlying job is permanent or temporary.
(b) The employer's need is considered temporary if justified to the CO as one of the following: A one-time occurrence; a seasonal need; a peakload need; or an intermittent need, as defined by DHS regulations. Except where the employer's need is based on a one-time occurrence, the CO will deny a request for an H-2B Registration or an Application for Temporary Employment Certification where the employer has a need lasting more than 9 months.
(c) A job contractor will only be permitted to seek certification if it can demonstrate through documentation its own temporary need, not that of its employer-client(s). A job contractor will only be permitted to file applications based on a seasonal need or a one-time occurrence.
(d) Nothing in this paragraph (d) is intended to limit the authority of the Secretary of Homeland Security, in the course of adjudicating an H-2B petition, to make the final determination as to whether a prospective H-2B employer's need is temporary in nature.

20 C.F.R. §655.6