Of all 50 states in the U.S., Colorado ranks high as one of the most hail-prone states, especially during the spring and summer months. Hail season typically runs from April 15th through September 15th, however it is not unusual for March to see hail showers as well. On the eastern side of the Rocky Mountains, hail happens more frequently that any other place in all of North America.
When high winds combine with hail, the possibility for damage increases significantly. Perhaps this is why destructive hail occurs most frequently in the western Great Plains and surrounding the border of Colorado, Wyoming, and Nebraska.
According to the Department of Atmospheric Science at Colorado State University in Fort Collins, “Colorado hail storms occur most frequently in June and are most likely to be destructive in mid June. However, in parts of southeastern Colorado, including Pueblo, August is the worst hail month.”
Each summer Coloradans can expect multiple hail storms with stones measuring 1-2 inches wide. Depending on the area of the state where you reside, hail stones can greatly vary. In northeastern Colorado, hail stones with a 4.5 inch diameter have been recorded. Up in the mountains hail is also a frequent occurrence, however smaller and much softer stones are observed which rarely result in damage.