Switzerland-Wide Siren Test - the Siren Howls: How to React Correctly in an Emergency

Schweizer Radio und Fernsehen (SRF)

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Once a year, the sirens sound Swiss-wide, a test for the emergency. The most important facts for all cases.

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On February 4, 2026, the sirens wailing in Switzerland – because the Federal Office for People's Protection carries out the siren test. What you need to know about the test alarm.

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Around 5000 sirens are crying this Wednesday throughout Switzerland. This annual test is to show if the sirens are reliably alarming.

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The traditional sirens test will take place on Wednesday, February 4, and around 5000 sirens will sound throughout Switzerland between 1:30 p.m. and 4:30 p.m. This will also be an opportunity to check the delivery of messages via the Alertswiss app.