Hail HistoryHome › Colorado › Boulder County › Niwot
Hail history for Niwot, CO
Hail has been reported within 10 miles of Niwot on 62 days since 2006. The largest stones measured 2.5 in (tennis ball) on Jul 5, 2019. Hail is most common here in June and May.
Recent hail near Niwot
| Date | Hail size | Where |
|---|---|---|
| Aug 10, 2025 | 1 in quarter | Niwot, Lafayette 5 hail reports · closest 3 mi from Niwot |
| Jul 11, 2025 | 1 in quarter | Louisville, Niwot 3 hail reports · closest 3 mi from Niwot |
| Jun 17, 2025 | 1 in quarter | Louisville, Lafayette, Erie 6 hail reports · closest 7 mi from Niwot |
| May 18, 2025 | 1 in quarter | Marshall 1 hail report · closest 10 mi from Niwot |
| May 14, 2025 | 1.25 in half dollar | Erie, Frederick 5 hail reports · closest 7 mi from Niwot |
One row per day: the largest hail reported that day within 10 miles, the places and the number of reports.
Hail days near Niwot by year
When hail season peaks near Niwot
Of the 62 hail days since 2006, most fell in June (19) and May (15).
Largest hail storms near Niwot
Jun 24, 2006 · 2.5 in (tennis ball) · Boulder (10 mi from Niwot)
Jun 4, 2015 · 2.5 in (tennis ball) · Lyons (10 mi from Niwot)
Jun 18, 2018 · 2.5 in (tennis ball) · Lafayette (7 mi from Niwot)
Jul 5, 2019 · 2.5 in (tennis ball) · Louisville (7 mi from Niwot)
May 22, 2008 · 2 in (hen egg) · Liberty (7 mi from Niwot)
Tornadoes within 10 miles of Niwot
| Date | Rating | Where |
|---|---|---|
| Aug 3, 2013 | EF0 | Erie 7 mi from Niwot |
Damaging thunderstorm winds near Niwot
20 reports of damaging thunderstorm wind within 10 miles of Niwot since 2006, on 15 days. The strongest measured gust was 72 mph on Mar 30, 2014.
| Date | Strongest gust | Where |
|---|---|---|
| Jul 20, 2024 | 61 mph, measured | Niwot 1 wind report |
| Jul 31, 2023 | 61 mph, measured | Superior 1 wind report |
| Jun 6, 2020 | 60 mph, estimated | Louisville 1 wind report |
| Jun 28, 2019 | 58 mph, measured | Longmont Muni Airport 1 wind report |
| Jun 17, 2019 | 62 mph, measured | Boulder Airport 1 wind report |
| Jul 25, 2018 | 81 mph, estimated | Erie 2 wind reports |
| Aug 4, 2017 | 70 mph, estimated | Niwot 1 wind report |
| Mar 30, 2014 | 72 mph, measured | Longmont, Erie 2 wind reports |
| Sep 18, 2013 | 66 mph, measured | Boulder 1 wind report |
| Aug 3, 2013 | 68 mph, measured | Erie 2 wind reports |
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 Niwot; 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.
Nearby cities
- Thornton
69 hail days - Westminster
70 hail days - Arvada
81 hail days - Denver
99 hail days - Lakewood
87 hail days - Aurora
89 hail days - Greeley
54 hail days - Fort Collins
56 hail days
Data: NOAA NCEI Storm Events Database (final records through Jun 30, 2026) and National Weather Service Local Storm Reports (preliminary, since then). Distances are measured from the center of Niwot.
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