Sep 10, 2021 - News

Colorado events honoring the 20th anniversary of 9/11

Participants seen during the 2017 Colorado 9/11 Memorial Stair Climb at Red Rocks Park and Amphitheater. Photo: RJ Sangosti/The Denver Post via Getty Images

Colorado will memorialize the nearly 3,000 people who lost their lives in the 9/11 attacks, including United Flight 93 Capt. Jason Dahl of Littleton.

What's happening: Across the state, flags will be lowered to half-staff in honor of the people who died in the Sept. 11 attacks.

Friday: Lakewood will display 2,996 American flags — one for each life lost — outside Leprino Hall at the Centennial Institute. The memorial will run through Saturday.

Saturday: The 2021 Colorado 9/11 Memorial Stair Climb event will take place at Red Rocks Park and Amphitheatre. The opening ceremony begins at 8:46am, when the first plane crashed into the North Twin Tower. Event registration is full.

  • The 9/11 Heroes Run 5k will kick off at 9am at Great Lawn Park and is open to runners and walkers of all ages. Day-of registration is $40.
  • 343 firefighters will meet at 1801 California St. to honor the 343 firefighters who died on Sept. 11. The event is exclusive to firefighters.
  • 9News will air a special report called "Remember the Sky: 20 Years after 9/11" at 6pm featuring Coloradans who were on the ground in New York City.
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