The emergency siren system is an all-hazard warning system used to alert citizens who are outdoors to potential danger. More than thirty outdoor warning sirens are in place across Boulder County.
The same signal is used whether the emergency is a flood, tornado or other disaster. If you hear a siren, tune to a local TV or radio station for further information.
The outdoor warning sirens are sounded only in the event of an emergency or during pre-announced tests. The sirens are tested May-September on the first Monday of each month at 10:00 am and 7:00 pm.
ACTUAL EMERGENCIES - sirens sound for five minutes
TESTS - sirens sound for two minutes