Hail history by city

Radar-indicated hail history for 15 Colorado cities, year by year, from NOAA MRMS. Free.

Demo data

Days with radar-indicated hail in the archive, per city.
City	Days with an event	Peak class	Population
Pueblo, CO	54	moderate	111,876
Colorado Springs, CO	30	light	478,961
Castle Rock, CO	29	moderate	73,158
Centennial, CO	28	light	108,418
Aurora, CO	27	moderate	386,261
Parker, CO	27	moderate	58,512
Greeley, CO	20	light	108,795
Denver, CO	19	moderate	715,522
Fort Collins, CO	19	light	169,810
Littleton, CO	19	light	45,652
Lakewood, CO	15	light	155,984
Thornton, CO	14	moderate	141,867
Boulder, CO	12	light	108,250
Westminster, CO	10	light	116,317
Arvada, CO	8	light	124,402

The honest Colorado caveat

The Denver metro is where this method performs worst in the entire country: radar misses roughly 1 in 4 ground-confirmed events. No shading here is not proof that no hail fell.