Hail in Boulder, CO
Since January 2025, radar estimated hail within 5 miles of Boulder on 7 days. The biggest estimate: 1 in or larger (quarter), on Thu, Jul 9, 2026. Hail was reported to the National Weather Service within 10 miles on 4 days.
Still loading: radar estimates go back to Wed, Oct 14, 2020, and the earlier years are being added.
By year: 2026: 3 · 2025: 4
Every hail day
- Fri, Jul 24, 2026
Radar estimate within 5 miles: 0.75 in or larger (penny)
No hail reported within 10 miles.
- Thu, Jul 9, 2026
Radar estimate within 5 miles: 1 in or larger (quarter)
No hail reported within 10 miles.
- Sun, Jun 21, 2026
Radar estimate within 5 miles: 0.75 in or larger (penny)
No hail reported within 10 miles.
- Sun, Aug 10, 2025
Radar estimate within 5 miles: 1 in or larger (quarter)
Reported within 10 miles- 1 in, 6.6 mi NE (3 S Niwot, CO)
- Fri, Jul 11, 2025
Radar estimate within 5 miles: 1 in or larger (quarter)
Reported within 10 miles- 1 in, 6.6 mi E (1 NNW Louisville, CO)
- Tue, Jun 17, 2025
Radar estimate within 5 miles: 1 in or larger (quarter)
Reported within 10 miles- 1 in, 7.5 mi E (2 WNW Lafayette, CO)
- Sun, May 18, 2025
Radar estimate within 5 miles: 1 in or larger (quarter)
Reported within 10 miles- 1 in, 2.5 mi S (3 NNW Marshall, CO)
Measured from Boulder's centre: radar estimates within 5 miles, reports within 10. Radar estimates come from NOAA's MRMS estimated hail size (MESH), the largest hail the radar estimates aloft on a ~1 km grid. They often run larger than the hail that reached the ground, and they aren't an observation at any address. Reports are what people reported to the National Weather Service. Neither is proof of damage or an official record for an insurance claim.