WARN Act Requirements in California: Advance Layoff Notice Rules

The Worker Adjustment and Retraining Notification Act (WARN Act), 29 U.S.C. § 2101 et seq., is a federal law requiring employers to provide written notice of plant closings and mass layoffs. It applies to private employers with 100 or more full-time employees on the payroll during the previous 12 months, within 75 miles of the affected site. A 'mass layoff' occurs when 50 or more employees lose employment within any 30-day period; a 'plant closing' occurs when a facility or substantial portion of an employer's operations cease, resulting in 50 or more job losses.

The law requires employers to provide 60 days' written notice to affected employees (or their representatives), the local workforce agency, and the chief elected official of the affected municipality. The notice must include the date of the layoff or closing, the expected duration, and the worker's rights under the law. Covered employers must provide this notice unless there are narrow exceptions (temporary closure, unforeseeable business circumstances, or natural disasters).

The WARN Act is enforced by the Department of Labor (DOL) and through private litigation. Employees can recover 60 days of back pay and benefits, plus court costs and attorney's fees. The DOL may also pursue penalties. Violations include failure to provide notice, providing notice less than 60 days in advance, or failure to continue health insurance coverage during the notice period.

California enforces the federal WARN Act but does not impose requirements stricter than or separate from federal law. California Labor Code Section 230 et seq. incorporates the WARN Act's requirements; there is no California-specific plant-closing notification statute with more expansive coverage. This means California employers are subject only to the federal WARN Act threshold (100+ employees) and federal notice requirements (60 days for 50+ job losses).

Unlike some states that have enacted state-level plant-closing laws with lower thresholds, California has not created a parallel state-only notice requirement. Therefore, an employer with 50–99 employees in California must comply with WARN Act notice requirements only if the employer meets the 100-employee federal threshold. An employer with 50–99 employees in California is not required to provide advance notice under state law alone.

California does, however, have strong wrongful termination and retaliation protections (Labor Code § 2870 et seq.) that may apply to individual terminations or layoffs that violate public policy, such as retaliation for jury duty, military service, or refusing to commit an illegal act. These protections are independent of WARN Act requirements and may provide remedies in cases where a layoff is motivated by retaliation.

California also applies the federal WARN Act's calculation rules: the 100-employee threshold looks at full-time and part-time employees combined, counted during the past 12 months. California courts have consistently interpreted and enforced the WARN Act with no material deviation from federal interpretation. Remedies under the WARN Act—60 days of back pay and benefits, plus attorney's fees—are the primary remedies available to California workers.

The WARN Act contains narrow exceptions to the 60-day notice requirement. A temporary layoff or closure, expected to last less than 6 months, does not trigger WARN Act notice if the employer reasonably believes the closure is temporary. Unforeseeable business circumstances—such as a major customer loss, unexpected strike, or sudden economic downturn—may reduce the notice period if the employer proves the circumstances were unforeseeable and the employer exercised due diligence. Natural disasters, weather events, or extraordinary events beyond the employer's control may also provide an exception.

However, these exceptions are interpreted narrowly. An employer cannot claim 'unforeseeable circumstances' for a market downturn, slowdown in demand, or routine business fluctuations. The employer bears the burden of proving the circumstances were truly unforeseeable and that reasonable efforts were made to provide notice despite the circumstances.

Additionally, certain small layoffs fall outside WARN Act coverage: reductions affecting fewer than 50 employees at a single site, even if spread over time, are not subject to WARN Act notice. Temporary workers, independent contractors, and workers outside the 75-mile radius of the affected site are not counted toward the 50-employee threshold. At-will employment does not provide an exception; employers cannot avoid WARN Act notice by citing at-will employment status. Union employees and employees covered by a collective bargaining agreement are fully covered by WARN Act requirements, though the notice may be given to union representatives rather than individual workers.

Step 1: Document the mass layoff. Keep records of all affected employees, their job titles, departments, rates of pay, hire dates, and the effective date of job loss. Document whether the layoff meets the 50-employee threshold and occurs within a 30-day period at a single site. Save all written communications from the employer about the closure or reduction, including emails, memos, and notices. Record the date you received notice (or the date you learned of the layoff if no notice was given) and the exact language used.

Step 2: Request internal review or appeal (if applicable). Some employers have internal procedures for challenging layoff decisions or requesting reconsideration. While not required by law, filing an internal grievance creates documentation of your complaint and shows you attempted to resolve the issue. Communicate in writing with HR or management expressing your concern that WARN Act notice was not provided. Keep copies of all correspondence.

Step 3: File a complaint with the appropriate agency. You have three options: (1) file a complaint with the U.S. Department of Labor, Wage and Hour Division at www.dol.gov or contact the DOL regional office serving California (San Francisco Regional Office: 415-625-2660); (2) file a complaint with the California Labor Commissioner at www.dir.ca.gov/dlse or contact the nearest local labor commissioner office; or (3) file a private civil lawsuit in California state or federal court. For a DOL complaint, provide the employer's name and address, the number of affected employees, the date of the layoff, and documentation that notice was not provided. For a California Labor Commissioner complaint, provide the same information plus your name, address, and contact information.

Step 4: Understand the investigation process. If you file with the DOL, the agency will investigate the employer's compliance. The investigation typically takes 30–60 days. The DOL will contact the employer, review payroll records, and interview affected workers. You may be asked to provide additional documentation. If the DOL finds a violation, it may pursue penalties or refer the case for private litigation. If you file a private lawsuit, your attorney will issue discovery requests to the employer, obtain payroll records, and may depose company officials. Litigation typically takes 1–2 years unless the parties settle.

Step 5: Consult an employment attorney. WARN Act violations are complex and require legal expertise. Consult an attorney who specializes in employment law and wage claims in California. Many attorneys work on a contingency fee basis (paid only if you win) for WARN Act cases. An attorney can evaluate whether your case meets the 50-employee threshold, negotiate a settlement, or pursue litigation. Contact the California State Bar Lawyer Referral Service at www.calbar.ca.gov or a local employment law clinic for a referral.