Hail History

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Hail history for Boulder, CO

Last hail within 10 milesAug 23, 20250.75 in (penny)
Hail days, last 12 monthsNone
Largest hail since 20063 in (tea cup)Jun 18, 2018
Hail days since 200650
Days with hail 1 inch or larger30
Damaging wind reports within 10 miles17

Hail has been reported within 10 miles of Boulder on 50 days since 2006. The largest stones measured 3 in (tea cup) on Jun 18, 2018. Hail is most common here in June and July.

Boulder ranks #89 for hail days among the 311 U.S. cities of 100,000 or more people. See the ranking →

Recent hail near Boulder

DateHail sizeWhereSource
Aug 23, 20250.75 in
penny		Rollinsville
1 hail report · closest 9 mi from Boulder		NOAA Storm Events
Aug 10, 20251 in
quarter		Niwot
3 hail reports · closest 6 mi from Boulder		NOAA Storm Events
Jul 11, 20251 in
quarter		Louisville, Niwot
3 hail reports · closest 6 mi from Boulder		NOAA Storm Events
Jun 17, 20251 in
quarter		Louisville
1 hail report · closest 8 mi from Boulder		NOAA Storm Events
May 18, 20251 in
quarter		Marshall
2 hail reports · closest 2 mi from Boulder		NOAA Storm Events

One row per day: the largest hail reported that day within 10 miles, the places and the number of reports.

Hail days near Boulder by year

30660708509410211121131141151162175185192022132232312452526

When hail season peaks near Boulder

Of the 50 hail days since 2006, most fell in June (15) and July (12).

JanFeb1Mar2Apr12May15Jun12Jul5Aug2Sep1OctNovDec

Largest hail storms near Boulder

Jun 18, 2018 · 3 in (tea cup) · Superior (9 mi from Boulder)

Jun 24, 2006 · 2.5 in (tennis ball) · Boulder (2 mi from Boulder)

Jul 5, 2019 · 2.5 in (tennis ball) · Louisville (8 mi from Boulder)

Jul 3, 2007 · 2 in (hen egg) · Rollins (9 mi from Boulder)

Jun 22, 2009 · 2 in (hen egg) · Crescent (9 mi from Boulder)

Damaging thunderstorm winds near Boulder

17 reports of damaging thunderstorm wind within 10 miles of Boulder since 2006, on 12 days. The strongest measured gust was 75 mph on Jul 10, 2011.

DateStrongest gustWhereSource
Jul 10, 202564 mph, measuredJefferson Co Airport
1 wind report		NOAA Storm Events
Jul 20, 202461 mph, measuredNiwot
1 wind report		NOAA Storm Events
Jul 31, 202361 mph, measuredSuperior
1 wind report		NOAA Storm Events
Jun 6, 202063 mph, measuredGold Hill, Louisville
2 wind reports		NOAA Storm Events
Jun 17, 201962 mph, measuredBoulder Airport
1 wind report		NOAA Storm Events
Aug 3, 201867 mph, measuredGold Hill, Boulder, Jefferson Co Airport
3 wind reports		NOAA Storm Events
Sep 18, 201366 mph, measuredBoulder
1 wind report		NOAA Storm Events
Jul 10, 201175 mph, measuredSuperior, Louisville
2 wind reports		NOAA Storm Events
Jun 30, 201164 mph, measuredBoulder Airport
1 wind report		NOAA Storm Events
Aug 19, 201062 mph, measuredBoulder
2 wind reports		NOAA Storm Events

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; 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

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 Boulder.

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