Fifty for 150: Columbine High School is site of mass shooting in 1999

The mass shooting at Columbine High School on Aug. 20, 1999, became the largest school shooting in history at the time.

By: Lindsey Toomer

Outlets: Colorado Newsline

Published: June 8, 2026

Words: 585

Last Updated: 3 weeks, 2 days ago

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The massacre at Columbine High School on April 20, 1999, became the largest school shooting in U.S. history at the time. It left 12 students, one teacher and both gunmen dead.

This story is part of Colorado at 150. Each Fifty for 150 story focuses on an event that helped define Colorado over 150 years of statehood. Newsline is publishing one Fifty for 150 story every weekday in reverse …

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