◆ NIWOT, CO HAIL HISTORY · BOULDER COUNTY
Niwot, CO hail history & hail map
Niwot, Colorado has had 34 hail events in the past 5 years, with hail up to 1.25″ (Half Dollar). Most recent: Aug 27, 2026. Free hail map, storm dates and NWS/CoCoRaHS reports.
✓ Data compiled by a degreed meteorologist from NOAA & NWS sources
34Hail events in the past 5 years
1.25″Largest recorded hail · Half Dollar
1.00″Largest ground report (within 3 mi)
1.25″Largest radar-estimated hail
Radar hail swaths (NOAA MRMS MESH) in the past 5 years over Niwot, shaded by hail size; blue dots are ground reports.
Recent hail storm dates in Niwot
| Date | Peak hail | Sources |
|---|---|---|
| Aug 27, 2026 | 0.38″ Small | 1 ground report (max 0.38″) |
| May 29, 2026 | 0.10″ Small | 1 ground report (max 0.10″) |
| Sep 13, 2025 | 0.25″ Small | 1 ground report (max 0.25″) |
| Aug 11, 2025 | 1.00″ Quarter | Radar 1.00″ · 3 ground reports (max 1.00″) |
| Aug 10, 2025 | 0.88″ Nickel | 3 ground reports (max 0.88″) |
| Jul 12, 2025 | 0.75″ Penny | 1 ground report (max 0.75″) |
| Jul 11, 2025 | 0.75″ Penny | 2 ground reports (max 0.75″) |
| Jul 10, 2025 | 0.38″ Small | 1 ground report (max 0.38″) |
| Jun 18, 2025 | 0.25″ Small | 1 ground report (max 0.25″) |
| Jun 17, 2025 | 0.38″ Small | 1 ground report (max 0.38″) |
| May 18, 2025 | 0.38″ Small | 1 ground report (max 0.38″) |
| Apr 1, 2025 | 0.25″ Small | 1 ground report (max 0.25″) |
| Mar 29, 2025 | 0.25″ Small | 1 ground report (max 0.25″) |
| Aug 19, 2024 | 0.25″ Small | 1 ground report (max 0.25″) |
| Aug 14, 2024 | 0.38″ Small | 1 ground report (max 0.38″) |
| Jun 8, 2024 | 0.75″ Penny | 1 ground report (max 0.75″) |
| May 31, 2024 | 1.00″ Quarter | 3 ground reports (max 1.00″) |
| May 30, 2024 | 0.62″ Small | 4 ground reports (max 0.62″) |
| May 12, 2024 | 0.38″ Small | 2 ground reports (max 0.38″) |
| Apr 27, 2024 | 0.38″ Small | 1 ground report (max 0.38″) |
| Apr 26, 2024 | 0.50″ Small | 2 ground reports (max 0.50″) |
| Mar 24, 2024 | 0.25″ Small | 1 ground report (max 0.25″) |
| Jul 21, 2023 | 0.25″ Small | 1 ground report (max 0.25″) |
| Jul 6, 2023 | 0.38″ Small | 1 ground report (max 0.38″) |
| Jul 5, 2023 | 0.38″ Small | 1 ground report (max 0.38″) |
| May 28, 2023 | 1.00″ Quarter | 3 ground reports (max 1.00″) |
| May 26, 2023 | 0.38″ Small | 1 ground report (max 0.38″) |
| May 18, 2023 | 0.10″ Small | 1 ground report (max 0.10″) |
| May 10, 2023 | 1.00″ Quarter | 1 ground report (max 1.00″) |
| May 9, 2023 | 1.00″ Quarter | 1 ground report (max 1.00″) |
More Colorado hail history
All Colorado cities & hail days →
Events count days with NOAA MRMS radar hail over Niwot (40.060, -105.160) or an NWS / CoCoRaHS hail report within 3 miles. Data window: NOAA MRMS radar hail swaths Oct 2021 – Nov 2026; NWS / NCEI Storm Events reports Nov 2024 – Jul 2026; CoCoRaHS volunteer reports Oct 2021 – present. Radar hail sizes are estimates, not ground truth; hail at any single address can differ.