1. Colorado became a state on March 15, 1876. This date is celebrated as Colorado Day, and has been since 1907.

2. The first ski resort in Colorado, Arapahoe Basin, opened on March 15, 1946. It has since become one of the most popular ski destinations in the state.

3. On March 15, 1913, the city of Denver experienced its worst blizzard on record. Known as the Great Blizzard of 1913, it brought 45 inches of snow and caused extensive damage throughout the city.

4. The historic Stanley Hotel in Estes Park opened its doors on March 15, 1909. The hotel, which served as the inspiration for Stephen King's "The Shining," is renowned for its lavish architecture and mountain views.

5. On March 15, 1937, the city of Pueblo suffered a devastating flood that claimed over 100 lives and caused millions in damages. The flood, which was caused by heavy rainfall and the collapse of the town's levees, remains one of the worst natural disasters in Colorado history.