# WARN — US federal employment law thresholds by employee count

For WARN, full name is Worker Adjustment and Retraining Notification (WARN) Act; employee threshold is 100; requirement is you are required to provide a 60-day advance written notice to affected employees; counting note is part-time and temporary employees are included in the head-count calculation, verified against its source on 2026-08-04.

- **Law:** WARN
- **Full name:** Worker Adjustment and Retraining Notification (WARN) Act
- **Employee threshold:** 100
- **Requirement:** you are required to provide a 60-day advance written notice to affected employees
- **Counting note:** part-time and temporary employees are included in the head-count calculation

## What the source says

> Worker Adjustment and Retraining Notification (WARN) Act Per the <https://www.dol.gov/general/topic/termination/plantclosings> Worker Adjustment and Retraining Notification (WARN) Act , if your plant closes or you have a mass layoff, you are required to provide a 60-day advance written notice to affected employees.

## Source

- https://stratus.hr/resources/federal-law-breakdown-how-many-employees

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [US federal employment law thresholds by employee count](https://referencesource.org/regulatory-threshold-triggers/).