2021 in Colorado · Paulipedia

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The following is a list of events of the year 2021 in Colorado.

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2022 in U.S. states and territories
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March 22 — 2021 Boulder shooting: Nine civilians and a police officer are killed during a mass shooting at a King Soopers supermarket in Boulder.^[1]
March 23 — The suspect in the previous day's mass shooting at a King Soopers supermarket in Boulder, which resulted in the deaths of ten people, is charged with ten counts of murder.^[2]
April 6 — Colorado reports its first cases of the Lineage P.1 variant of SARS-CoV-2 in two people from Boulder County.^[3]
May 9 — 2021 Colorado Springs shooting: Six people are killed by a gunman in a mass shooting during a birthday party at a residence in Colorado Springs. The gunman, who committed suicide at the scene, is believed to have been a boyfriend of one of the victims.^[4]
August 2 — Denver Mayor Michael Hancock announces a COVID-19 vaccine mandate for school employees, contractors and volunteers.^[5]
November 5 — Two hyenas at Denver Zoo test positive for COVID-19, marking the first time the virus has infected that animal worldwide.^[6]
December 30 — Grass fires in Colorado, prompt the evacuation of the town of Superior and the cities of Louisville and Broomfield.^[7]

"Boulder shooting: Gunman kills 10 at King Soopers grocery store". www.bbc.com. March 23, 2021. Retrieved January 19, 2026.
Holcombe, Amir Vera,Jason Hanna,Madeline (March 23, 2021). "Suspect in Colorado grocery store shooting faces 10 counts of murder, police say". CNN. Retrieved January 19, 2026.{{cite web}}: CS1 maint: multiple names: authors list (link)
"Amp the Cause volunteers are wrapping over 20,000 presents for Holidays for Kids events". The Denver Post. November 20, 2015. Retrieved January 19, 2026.
"Colorado Springs: Gunman shoots dead six people and himself at birthday party". May 9, 2021. Retrieved January 19, 2026.
Fisher, Amber (August 2, 2021). "Vaccine Mandate In Denver: What To Know". Denver, CO Patch. Retrieved January 19, 2026.
"Hyenas at Denver Zoo test positive for COVID-19".{{cite web}}: CS1 maint: url-status (link)
Alvarado, Raja Razek,Steve Almasy,Caroll (December 30, 2021). "Hundreds of Colorado buildings lost and tens of thousands of residents told to evacuate due to fast-growing wildfires". CNN. Retrieved January 19, 2026.{{cite web}}: CS1 maint: multiple names: authors list (link)