The 2024 Colorado 9/11 Memorial Stair Climb took place at Red Rocks Park and Amphitheatre in Morrison on Sept. 11, 2024. Related Articles Colorado News | A 9/11 anniversary tradition is handed down to a new generation Colorado News | Letters: Why accept a plea deal in 9/11 case? “From newborns to — I think our oldest climber ever was in his late 80s — there are a lot of firefighters, a lot of police officers, the military and also just a lot of people from the community that want to come spend the day with us,” said organizer and West Metro firefighter Shawn Duncan. The Colorado 9/11 Stair Climb is in its 15th year.