Published: March 26, 2024

Boulder Disaster Management will begin audible outdoor emergency warning siren testing on Monday, April 1, at 10 a.m. and 7 p.m.

Tests are conducted on the first Monday of each month from April through August. Planned tests may be canceled during severe weather events or other emergencies.

Siren tests ensure all systems and procedures are working properly during peak flood season and are meant to be audible outdoors throughout Boulder County. 

Warning sirens provide those who are outdoors and in high-risk areas with audible alerts for flash flood warnings, tornado warnings, or upon request from first responders for imminent life threats. 

In emergencies, the sirens will broadcast a voice message immediately following the siren signal to inform the public of the situation and what actions should be taken. 

CU Boulder community members may hear the siren tests from many outdoor locations on Main Campus as well as East Campus, Research Park and South Campus. The audible sirens are designed to reach people who are outdoors, not indoors. 

Are you signed up for emergency notifications?

The tests are a good reminder to all students, faculty and staff to ensure they’re signed up for alerts for both on-campus and off-campus emergencies. Visit the CU Boulder Alerts website to learn about user sign-up, how to find information in an emergency, the Guardian mobile safety app and more.

For off-campus incidents, all campus community members are highly encouraged to ensure they are signed up for Everbridge to be notified of emergencies in the city of Boulder or Boulder County. 

Everbridge alerts are sent based on current local addresses. Students and employees are strongly encouraged to verify this information is accurate in Buff Portal and MyCUInfo.