Wiser Workplace

California WARN Act: Mass Layoff and Plant Closure Protections

Termination & Severance 8 min read Updated 2026-03-09

Overview

The Worker Adjustment and Retraining Notification (WARN) Act is a federal law that protects employees by requiring employers to provide advance notice of mass layoffs and plant closures. California has its own WARN Act provisions that often provide greater protection than the federal statute. Together, federal and California WARN Act protections provide significant job security in situations where employers conduct mass reductions in force.

Violations of WARN Act requirements can result in substantial liability for employers and provide important remedies for affected employees.

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Federal WARN Act

The federal WARN Act, enacted in 1988 and codified at 29 U.S.C. § 2101 et seq., applies to employers with 100 or more employees. The federal act requires employers to provide employees and relevant government agencies with 60 days' written notice before implementing a mass layoff, plant closure, or other substantial reduction in force.

Federal Coverage Threshold

The federal WARN Act applies to covered employers with 100 or more employees. In calculating employee count, employers count:

  • All employees on the payroll, including part-time employees
  • Employees at all locations
  • Employees on leave (with limited exceptions)

California WARN Act

California Labor Code Section 1400 et seq. establishes a California-specific WARN Act that is often more protective than the federal law. The California WARN Act applies to employers with 75 or more employees, a lower threshold than federal law.

California Coverage Threshold

The California WARN Act applies to covered employers with 75 or more employees in the state. This lower threshold means more employers are subject to California's more stringent requirements.

Key Differences from Federal WARN

  • California threshold (75 employees) is lower than federal threshold (100 employees)
  • California WARN provides certain additional protections and remedies
  • Where both federal and California WARN apply, the more protective standard controls

Notice Requirements

Both federal and California WARN Acts require employers to provide advance written notice to affected employees and relevant government agencies.

60-Day Notice Requirement

Employers must provide at least 60 calendar days of advance written notice before a mass layoff or plant closure. The notice must be provided to:

  • Each affected employee (individually)
  • The employee's labor union representative (if applicable)
  • The State Dislocated Worker Unit
  • The local workforce investment board
  • The chief elected official of the affected municipality

Required Notice Content

Notice must include:

  • The specific date of the mass layoff, plant closure, or relocation
  • Whether the layoff is temporary or permanent
  • The job titles of affected employees
  • The specific work locations affected
  • A brief description of the assistance available to affected workers (retraining, job placement)
  • Information on how employees may submit complaints or obtain more information

What Triggers WARN

WARN Act notice is required when an employer experiences one of the following triggering events:

Plant Closure

A permanent or temporary shutdown of a single site of employment or one or more facilities at a single site, resulting in a loss of employment of 50 or more employees during any 30-day period.

Mass Layoff

A reduction in force that is not the result of a plant closure, resulting in a loss of employment of 50 or more employees during any 30-day period at a single site. For California WARN, the threshold may apply to multiple facilities.

Relocation

Under California law the definition is narrower than "any move." Labor Code section 1400.5 defines relocation as the removal of all or substantially all of the industrial or commercial operations in a covered establishment to a different location 100 miles or more away. Moving part of an operation, or moving any distance under 100 miles, does not meet the definition, and the definition carries no separate 50-employee count of its own; the 75-employee covered-establishment threshold is what brings the employer within the chapter. Relocation requires notice if:

  • The removal is of all or substantially all operations in the covered establishment, to a location 100 miles or more away (Labor Code Section 1400.5)
  • The relocation results in an actual loss of employment (employees are not offered positions at the new location within reasonable commuting distance)

Exceptions to WARN

WARN Act notice requirements are subject to limited exceptions:

Faltering Company

An employer need not provide 60 days' notice if the employer was actively seeking capital or business, and a reasonable person would have believed that capital/business would be obtained in time to preclude or postpone the mass layoff. This exception is narrowly construed and rarely applies in practice.

Unforeseeable Business Circumstances

An employer need not provide full 60 days' notice if the mass layoff or plant closure is caused by unforeseeable circumstances beyond the employer's control. However, the employer must provide notice as soon as practicable. This exception covers sudden catastrophes or events such as earthquakes, fires, or similar disasters, not economic downturns.

Natural Disaster

A temporary closure due to a natural disaster (earthquake, hurricane, etc.) may be exempt from WARN requirements. However, if the closure becomes permanent, WARN obligations apply.

Penalties for Violations

Employers who fail to provide required WARN Act notice face substantial penalties and liability:

Back Pay and Benefits

An employee who was not given required notice may recover back pay at the higher of their average regular rate over the last three years or their final rate, plus the value of benefits they would have received. The period is capped twice over. Liability runs for the period of the violation up to a maximum of 60 days, or one-half the number of days the employee was employed, whichever is smaller (Labor Code Section 1402(b); 29 U.S.C. Section 2104(a)). That second cap is easy to miss and controls for anyone with under four months of service: an employee of 60 days is limited to 30 days of back pay, not 60. The amount is also reduced by wages the employer paid for the violation period and by voluntary payments it was not legally obliged to make.

Civil Penalty

Labor Code Section 1403 provides a civil penalty of not more than $500 for each day of the violation, but the employer avoids it entirely by paying employees what it owes under Section 1402 within three weeks of ordering the action. The federal analogue, 29 U.S.C. Section 2104(a)(3), carries the same $500-per-day figure and the same three-week escape, but applies only where the violation is with respect to a unit of local government. Neither statute provides liquidated damages.

Attorney's Fees and Costs

A fee award is discretionary, not automatic. Labor Code Section 1404 says the court "may award reasonable attorney's fees as part of costs to any plaintiff who prevails." The federal provision, 29 U.S.C. Section 2104(a)(6), is broader in one respect that cuts against employees: it lets the court in its discretion allow a fee to the prevailing party, not only a prevailing plaintiff.

No Criminal Penalties

Neither the California WARN Act nor the federal WARN Act provides for criminal penalties. The federal statute goes further and states that the remedies it lists "shall be the exclusive remedies for any violation of this chapter," and that a federal court has no authority to enjoin a plant closing or mass layoff (29 U.S.C. Section 2104(b)). A court may also reduce liability where the employer proves the violation was in good faith and it had reasonable grounds to believe its conduct was lawful.

Employee Remedies

Employees affected by a WARN Act violation have several available remedies:

Individual Lawsuits

Employees may bring individual lawsuits against the employer for failure to provide required notice. Claims include:

  • Back pay for up to 60 days, or one-half the days employed, whichever is smaller
  • Continuation of fringe benefits
  • Interest on unpaid compensation
  • Attorney's fees and costs

Class Action Lawsuits

WARN Act cases are frequently brought as class actions on behalf of all affected employees. Class actions allow for efficient recovery and maximum pressure on employers.

Administrative Complaints

Employees may file complaints with the U.S. Department of Labor (for federal WARN) or California Department of Industrial Relations (for California WARN).

Who to Sue

WARN Act violations create liability for the employer entity and may create personal liability in some circumstances:

Employer Liability

The primary defendant in a WARN Act suit is the employer. The employer is liable regardless of whether individual executives or managers had knowledge of or authorized the violation.

Individual Personal Liability

In limited circumstances, individual officers or agents may be held personally liable, though such liability is less common in WARN Act cases compared to wage and hour cases.

Best Practices for Employees

Employees facing potential layoffs or plant closures should consider:

  • Seeking written notice of any mass reduction in force from the employer
  • Documenting the date when notice was received (or when the reduction occurred without notice)
  • Gathering information about the number of employees affected and the timeline of events
  • Consulting with an employment attorney if notice was not provided or was insufficient
  • Understanding that failure to provide notice creates employer liability, not employee fault
  • Exploring potential claims for other violations that may accompany mass layoffs (age discrimination, retaliation, etc.)

Conclusion

The WARN Act, both federal and California versions, provides critical protections for employees facing mass layoffs and plant closures. Employers who fail to provide required notice expose themselves to significant liability. If you believe your employer failed to provide required WARN Act notice, consult with a qualified employment attorney to understand your rights and potential remedies.

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See also: disability and age discrimination.

Important Disclaimer: This guide is for general informational and educational purposes only and does not constitute legal advice. No attorney-client relationship is created by reading this guide. Employment law changes often and every situation is different. If you need legal advice about your specific situation, please consult a qualified California employment attorney. About the legal citations on this page. Statutory and case citations are given so you can find and read the underlying law yourself, and they are offered for reference only. Verify any citation you intend to rely on against the official source: leginfo.legislature.ca.gov for California statutes, and the official reporters or the courts' own published opinions for cases. Codes are amended and cases are reviewed, depublished, or distinguished, so a citation that was accurate when this page was written may not be current. A summary of a provision is never a substitute for its text, and nothing here should be relied on without independent verification.
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