Hail HistoryHome › Colorado › Boulder County
Hail history for Boulder County, CO
209 hail reports in Boulder County since 2006 on 67 days. The largest stones measured 3 in (tea cup) on Jun 18, 2018.
Cities in Boulder County
- Boulder
50 hail days - Longmont
54 hail days - Lafayette
71 hail days - Erie
71 hail days - Louisville
69 hail days - Superior
68 hail days - Gunbarrel
60 hail days - Niwot
62 hail days
Recent hail in Boulder County
| Date | Hail size | Where |
|---|---|---|
| Jul 28, 2026 | 1 in quarter | Lyons 1 hail report |
| Aug 10, 2025 | 1 in quarter | Niwot, Lafayette 5 hail reports |
| Jul 11, 2025 | 1 in quarter | Louisville, Niwot, Lafayette 4 hail reports |
| Jun 17, 2025 | 1 in quarter | Louisville, Lafayette 5 hail reports |
| May 18, 2025 | 1 in quarter | Marshall 2 hail reports |
One row per day: the largest hail reported in the county that day, the places and the number of reports.
Hail days in Boulder County by year
When hail season peaks in Boulder County
Damaging thunderstorm winds in Boulder County
21 reports of damaging thunderstorm wind in Boulder County since 2006, on 16 days. The strongest measured gust was 75 mph on Jul 10, 2011.
| Date | Strongest gust | Where |
|---|---|---|
| Jul 28, 2026 | 55 mph, measured | Pinewood Springs 1 wind report |
| Jul 20, 2024 | 61 mph, measured | Niwot 1 wind report |
| Jul 31, 2023 | 61 mph, measured | Superior 1 wind report |
| Jun 6, 2020 | 63 mph, measured | Gold Hill, Louisville 2 wind reports |
| Jun 28, 2019 | 58 mph, measured | Longmont Muni Airport 1 wind report |
| Jun 17, 2019 | 62 mph, measured | Boulder Airport 1 wind report |
| Aug 3, 2018 | 67 mph, measured | Gold Hill, Boulder 2 wind reports |
| Aug 4, 2017 | 70 mph, estimated | Niwot 1 wind report |
| Mar 30, 2014 | 72 mph, measured | Longmont 1 wind report |
| Sep 18, 2013 | 66 mph, measured | Boulder 1 wind report |
Severe thunderstorm wind means gusts of 58 mph or more, or wind that caused damage. Measured gusts come from weather stations; estimated ones from spotters and damage surveys.
Filing a roof or car hail claim?
Insurers ask for the date of loss. The dates on this page are when hail was reported near Boulder County; hail can hit one street and miss the next, so a report is not proof of damage at your address. A licensed roofer or your insurance adjuster can inspect the roof. Many policies set a time limit for filing a claim — check yours.
Data: NOAA NCEI Storm Events Database (final records through Jun 30, 2026) and National Weather Service Local Storm Reports (preliminary, since then).