The 2022 Colorado 9/11 Memorial Stair Climb took place at Red Rocks Park and Amphitheatre in Morrison on Sept. 11, 2022. The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by the militant Islamic extremist network al-Qaeda against the United States on Tuesday, September 11, 2001. A total of 2996 people died in the attacks 21 years ago. Participants made 9 laps to simulate the 110-story climb that firefighters had to endure while climbing up the World Trade Center towers in New York City to try to save people. The funds raised during the event, through donations and participation fees, go to support the families of those firefighters who died on 9/11.