The monthly emergency siren testing has been CANCELLED for May 4 due to current weather conditions. If you do hear a siren, you should assume it is NOT a test
Typically, the audible siren tests will occur twice on each testing day, at 10 a.m. and 7 p.m., on April 6, May 4, June 1, July 6 and Aug. 3. Should Boulder County experience severe weather during one of the planned audible tests, the siren tests for that day may be cancelled.