This event is a four-day run of hail from May 30 to June 2, 1991, recorded in Adams, Arapahoe, Denver, Douglas, Jefferson and Weld counties. NCEI holds 23 reports in the Front Range counties, with stones up to 2.5 inches (tennis ball).
RMIIA does not name a city for it. The dates come from a 2009 Claims Journal article citing RMIIA, which gives $100 million in insured losses; RMIIA's own table lists the event as June 1991 at $238 million in 2025 dollars.
Hail history for the counties hit
- Denver metro hail history
- Weld County: see the full Colorado table
Significant Colorado storms around 1991
- July 11, 1990: hail to 2.75 in., $625 million (1990 dollars) insured
- October 1, 1994: hail to 2 in., $225 million (1994 dollars) insured
- May 22, 1996: hail to 2 in., $122 million (1996 dollars) insured
- August 11, 1997: hail to 2 in., $128 million (1997 dollars) insured
- The full Colorado storm table
Sources: Colorado Storms Cost $350 Million in Insured Damage (citing RMIIA) (Claims Journal, 2009-07-27); Catastrophe Facts & Statistics (RMIIA); NOAA NCEI Storm Events Database (NOAA National Centers for Environmental Information).
