The federal Worker Adjustment and Retraining Notification Act (WARN Act), administered by the U.S. Department of Labor, generally requires employers of a certain size to give workers 60 days of advance written notice before a "plant closing" or "mass layoff." Where an employer skipped notice — or shortened it without a valid exception — the statute generally provides affected workers up to 60 days of back pay and benefits. Whether and how much applies depends on your situation, and the rules and figures below can change.
WARN is one of the few federal worker-protection statutes with a clear, money-on-the-table remedy. It is also one of the most commonly violated, because the 60-day clock cuts against the way layoffs are usually planned. Understanding how WARN works lets many people check what they were generally owed and act before the deadlines close.
This is the federal floor. Several states — including California, New York, Illinois, and New Jersey — have stronger "mini-WARN" laws that generally lower the employer-size threshold, lengthen the notice period, or add severance on top. Where a state law is stronger, it typically controls — so your state may differ.
When does federal WARN apply?
The DOL explains that federal WARN generally applies to employers with 100 or more full-time employees (or 100+ employees who together work at least 4,000 hours per week excluding overtime). Coverage is typically assessed at the corporate parent level — separately-incorporated subsidiaries can be aggregated where the parent runs them as a single operation. How this plays out depends on the specific corporate structure.
Under WARN, 60 days notice is generally required for either of two triggering events at a single site of employment:
- Plant closing. A permanent or temporary shutdown of a single site (or one or more facilities or operating units within a site) that results in employment loss for 50 or more full-time employees during any 30-day period.
- Mass layoff. An employment loss at a single site of either (a) 500 or more full-time employees, or (b) 50 to 499 full-time employees if they make up at least 33% of the active full-time workforce at that site, during any 30-day period.
Under the statute, "employment loss" generally includes terminations other than for cause, layoffs exceeding 6 months, and reductions in hours of more than 50% in each month of any 6-month period. Voluntary departures, retirements, and discharges for cause typically do not count.
The 30-day window can be aggregated. Where an employer staggers separations to stay under the threshold (for example, three rolling waves of 20 layoffs in 90 days), WARN's 90-day aggregation rule may still pull them into the count if the layoffs are reasonably viewed as part of a single course of action — though how a court treats this depends on the facts.
What must the notice include?
The DOL says WARN notice generally must be in writing and delivered to each affected worker (or their union representative), the state's dislocated worker unit, and the chief elected official of the local government where the closing or layoff will occur. The notice is typically required to state:
- Whether the action is permanent or temporary
- The expected date of the first separation and a schedule for subsequent separations
- Whether bumping rights apply
- The name and phone number of a company official to contact for additional information
A vague all-hands email saying "we expect headcount reductions" is generally not treated as WARN notice. The notice typically has to identify the specific layoff or closing.
What exceptions are recognized?
Under WARN, three narrow exceptions generally let an employer shorten (not eliminate) the 60-day notice:
- Faltering company. An employer actively seeking capital or business that, if obtained, would let it avoid or postpone the closing, and that reasonably and in good faith believed advance notice would have precluded the financing. Limited to plant closings — not mass layoffs.
- Unforeseeable business circumstances. A sudden, dramatic, and unexpected condition outside the employer's control (a major contract cancellation, a sudden government shutdown, the start of a strike at a major supplier). The pandemic-era cases are still being litigated; courts have been split.
- Natural disaster. A flood, earthquake, drought, storm, or similar event.
Even where an exception applies, the statute generally still requires the employer to give as much notice as is practicable and to include a brief statement of the basis for the reduced notice. Courts typically treat "we needed to act quickly" alone as not qualifying.
What are you owed for a WARN violation?
Where an employer is found to have violated WARN, the statute generally provides for recovery of:
- Back pay at your normal rate for each day of violation, up to 60 days (or half the days you worked for that employer, whichever is less)
- Benefits, including the cost of any medical expenses that would have been covered under an employee benefit plan during the violation period
- Attorneys' fees for prevailing plaintiffs
- A civil penalty (paid to the local government, not to you) of up to $500 per day for the violation period
Mass-layoff WARN cases are commonly litigated as class actions in federal court. Under the statute, employers can generally offset back-pay damages by any voluntary payments (severance not legally required) and by any wages paid during the violation period. What you might actually recover depends on the specifics of your situation.
Which states have mini-WARN laws?
Many states have their own WARN-style statutes that generally go further than the federal floor. Where state law is stronger, it typically controls — these rules vary by state and continue to change, so your state may differ.
California — Cal-WARN
- Threshold: 75 or more employees (excluding those who have worked fewer than 6 months in the last 12).
- Trigger: mass layoff (50+ employees in 30 days), plant closing, or relocation (single site moving 100+ miles).
- Notice: 60 days.
- No "unforeseeable business circumstances" exception. California rejected the federal exception; only "physical calamity" and an actively-seeking-capital faltering-company carve-out apply.
New York — NY WARN Act
- Threshold: 50 or more full-time employees.
- Trigger: mass layoff (25+ employees if they make up 33% of the workforce, or 250+ regardless), plant closing (25+ employees), or relocation (more than 50 miles).
- Notice: 90 days (50% longer than federal).
- Penalties: back pay and benefits for the violation period, plus a state civil penalty.
New Jersey — NJ WARN Act (Millville Dallas Airmotive Act, as amended)
- Threshold: 100 or more employees (full-time and part-time combined, after the 2023 amendments).
- Trigger: mass layoff (50+ employees in 30 days, regardless of percentage), termination of operations, or transfer of operations.
- Notice: 90 days.
- Mandatory severance: the NJ statute generally provides 1 week of pay per year of service, with an additional 4 weeks owed if notice is short. New Jersey is generally regarded as the only state that requires severance as a baseline for mass layoffs, regardless of whether notice was given.
Illinois — IL WARN Act
- Threshold: 75 or more full-time employees, OR 75 employees who together work 4,000 hours per week.
- Trigger: mass layoff (25+ employees if 33% of the workforce, or 250+ regardless) or plant closing (25+ employees in 30 days).
- Notice: 60 days.
Maine — Severance Pay When Employer Relocates
Maine does not have a notice statute, but its severance law generally requires employers of 100+ at a single facility that relocate operations more than 100 miles to pay 1 week of severance per year of service to each affected employee. Layoffs that are not relocations are generally not covered.
Hawaii — Dislocated Workers Act
- Threshold: 50 or more employees.
- Notice: 60 days for closings, partial closings, or relocations.
- Supplemental severance: if notice is shortened, the employer owes the difference between the wages paid during the shortened notice and the wages that would have been paid during the full 60 days.
Wisconsin — Business Closing and Mass Layoff Notification Law
- Threshold: 50 or more employees.
- Trigger: business closing (25+ employees) or mass layoff (25% of the workforce or 25 employees, whichever is greater, with a 500-employee cap).
- Notice: 60 days.
Tennessee — Plant Closings and Reductions in Operations
- Threshold: 50 to 99 full-time employees (filling a gap the federal WARN floor leaves).
- Trigger: plant closing or mass layoff affecting 50 or more employees within a 3-month period.
- Notice: 60 days (modeled on federal WARN).
Roughly half of US states have no mini-WARN statute. In those states, federal WARN is generally the only notice floor and typically applies only where an employer has 100 or more employees.
What should you do if you think your employer violated WARN?
- Many people save every document about the layoff — the WARN notice (if any), the date it was issued, internal memos, the layoff date itself, and any communications about timing.
- A common step is to compare the dates. It often helps to count calendar days — not business days — between the notice date and your last day of work. Less than 60 (or 90 in NY/NJ; less than the applicable state period) is something many people treat as a red flag worth a closer look.
- Some people check whether the company crossed a threshold. Looking at the total separations at your site across a rolling 30-day window can be informative — WARN violations often hide in staggered layoffs that the company structured to stay below the trigger.
- Many people consult an employment attorney. WARN cases are frequently brought as class actions and are usually taken on contingency. The 2-year statute of limitations generally runs from the date of the violation, so timing can matter.
- People often file for unemployment promptly. WARN recovery generally does not delay unemployment eligibility, so filing early tends to preserve benefits while a WARN claim plays out — though your state's unemployment rules may differ.
Where a layoff affected enough people, coordinated representation is already common. Other employees at your site are often seeing the same gap, and the plaintiff-side employment bar tends to move quickly on these.
Official sources
Because thresholds, notice periods, and figures can change, many people confirm the current rules at the source for their situation:
- Legal Information Institute (Cornell Law) — 29 U.S. Code Chapter 23: Worker Adjustment and Retraining Notification (federal WARN Act)
- California Employment Development Department — Worker Adjustment and Retraining Notification (Cal-WARN)
- New York State Department of Labor — Worker Adjustment and Retraining Notification (NY WARN Act)
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