Hail history for Boulder County, Colorado
Every NOAA hail report filed in Boulder County since 1962, with preliminary National Weather Service reports to November 3, 2026.
Readout · Boulder County
- Last hail
- Jul 28, 2026
- 1.00 in, quarter size
- Hail days, last 5 years
- 15
- since Nov 3, 2021 · 38 reports
- Largest ever
- 3.00 in
- teacup · Jun 18, 2018
357 reports on 149 days since 1962 · #19 of 54 Colorado counties
Hail map · Boulder County
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
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What the record says about Boulder County
The latest hail report in Boulder County is from July 28, 2026, 1.00 in (quarter size). Since November 3, 2021 there have been 15 separate hail days; the biggest stones in that time were 1.75 in on May 9, 2023.
Over the 20 years 2006–2025, Boulder County logged 208 reports on 66 hail days, about 10.4 reports a year. That is 3.3 times the median Colorado county (3.1 a year) and ranks #19 of 54 Colorado counties for all-time reports. Boulder County holds 2% of all 15,580 hail reports in Colorado.
7% of reports with a size were 2 inches (hen egg) or larger, against 6% for the median Colorado county. The largest hail on record here is 3.00 in (teacup) on June 18, 2018 near 1.74 SE Superior.
Reports were up 70% in 2016–2025 (131) compared with 2006–2015 (77). The busiest year was 2018, with 45 reports on 8 days. Hail here peaks in June (36% of reports); 58% fall between April and June.
Reports a year 2006–2025 average
- Boulder County 10.4
- Median Colorado county 3.1
Hail days 2006–2025
- Boulder County 66
- Median Colorado county 41
Share 2 in or larger of sized reports
- Boulder County 7%
- Median Colorado county 6%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 1 | |||||||||||
| 2025 | 2 | 5 | 4 | 5 | 16 | ||||||||
| 2024 | 6 | 1 | 7 | ||||||||||
| 2023 | 6 | 3 | 9 | ||||||||||
| 2022 | 1 | 2 | 2 | 5 | |||||||||
| 2021 | 1 | 1 | 2 | ||||||||||
| 2020 | 1 | 1 | 2 | ||||||||||
| 2019 | 4 | 27 | 1 | 10 | 42 | ||||||||
| 2018 | 11 | 28 | 1 | 5 | 45 | ||||||||
| 2017 | 2 | 2 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 28, 2026 | 1 | 1.00 in | — |
| Aug 10, 2025 | 5 | 1.00 in | — |
| Jul 11, 2025 | 4 | 1.00 in | — |
| Jun 17, 2025 | 5 | 1.00 in | — |
| May 18, 2025 | 2 | 1.00 in | — |
| Jul 20, 2024 | 1 | 0.75 in | — |
| May 30, 2024 | 6 | 1.00 in | — |
| Jun 21, 2023 | 1 | 1.00 in | — |
| Jun 12, 2023 | 2 | 1.00 in | — |
| May 26, 2023 | 2 | 1.25 in | — |
| May 9, 2023 | 4 | 1.75 in | — |
| Oct 1, 2022 | 2 | 0.75 in | — |
| Jul 27, 2022 | 1 | 1.00 in | — |
| Jul 26, 2022 | 1 | 0.75 in | — |
| Jun 16, 2022 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 18, 2018 | 3.00 inteacup | 1.74 SE Superior | 18:31 local · NCEI |
| Jun 17, 1979 | 2.75 inbaseball | — | 17:05 local · NCEI |
| Jun 10, 1969 | 2.75 inbaseball | — | 15:22 local · NCEI |
| May 25, 1962 | 2.75 inbaseball | — | 14:30 local · NCEI |
| Jul 5, 2019 | 2.50 intennis ball | 2.14 NNE Louisville | 18:52 local · NCEI |
Sizes filed before 1996 are often rough estimates (round numbers like 7.00 or 8.00 in) without an exact spot; they are shown as NOAA filed them.
Size of every report
- Under 1 in 125 35%
- 1–2 in 207 58%
- 2 in + 24 7%
- No size 1
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jul 28, 2026 | 1.00 inquarter | 0.69 N Lyons | 13:04 local · NCEI |
| Aug 10, 2025 | 0.75 inpenny | 2.07 N Lafayette | 18:25 local · NCEI |
| Aug 10, 2025 | 0.75 inpenny | 3.45 N Lafayette | 18:20 local · NCEI |
| Aug 10, 2025 | 1.00 inquarter | 2.81 S Niwot | 18:13 local · NCEI |
| Aug 10, 2025 | 0.75 inpenny | 2.76 S Niwot | 18:10 local · NCEI |
| Aug 10, 2025 | 0.88 innickel | 2.76 S Niwot | 18:08 local · NCEI |
| Jul 11, 2025 | 0.75 inpenny | 2.14 SSW Lafayette | 17:42 local · NCEI |
| Jul 11, 2025 | 0.75 inpenny | 2.07 N Louisville | 17:29 local · NCEI |
| Jul 11, 2025 | 1.00 inquarter | 1.26 WNW Louisville | 17:27 local · NCEI |
| Jul 11, 2025 | 0.75 inpenny | 2.76 S Niwot | 17:10 local · NCEI |
| Jun 17, 2025 | 1.00 inquarter | 2.14 NNE Lafayette | 12:57 local · NCEI |
| Jun 17, 2025 | 0.75 inpenny | Lafayette | 12:52 local · NCEI |
Cities and towns in Boulder County
Smaller places with fewer than 10 reports
These places have too few reports for a page of their own, so their record lives here.
| Place | Reports | Hail days | Latest |
|---|---|---|---|
| Allenspark | 6 | 5 | Aug 16, 2015 |
| Pine Brook Hill | 6 | 5 | Jun 25, 2021 |
| Nederland | 4 | 3 | Aug 27, 2002 |
| Sugarloaf | 3 | 3 | Jul 27, 2022 |
| Superior | 3 | 3 | Jun 18, 2018 |
| Ward | 3 | 3 | May 7, 2014 |
| St. Ann Highlands | 2 | 2 | May 2, 2021 |
| Altona | 1 | 1 | May 26, 1987 |
| Bark Ranch | 1 | 1 | Aug 22, 1982 |
| Gold Hill | 1 | 1 | May 30, 2018 |
| Jamestown | 1 | 1 | Jun 7, 1975 |
| Lazy Acres | 1 | 1 | Jun 12, 1983 |
Questions about hail in Boulder County
How often does it hail in Boulder County, Colorado?
357 hail reports have been logged in Boulder County since 1962. Over the 20 years 2006–2025 that averages 10.4 reports a year. That ranks #19 of 54 Colorado counties by number of reports.
When is hail season in Boulder County?
Most reports come in June, July, May. June alone accounts for 36% of all reports.
What is the largest hail recorded in Boulder County?
3.00 in (teacup size) on June 18, 2018 near 1.74 SE Superior. 7% of reports here were 2 inches or larger.
When did it last hail in Boulder County?
The most recent report in this data is from July 28, 2026 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Boulder County had in the last five years?
15 separate days with hail reports since November 3, 2021, adding up to 38 reports. The most recent was July 28, 2026.
Where does this hail data come from?
Hail reports come from the NOAA NCEI Storm Events Database, which the National Weather Service compiles from spotter, public, law enforcement and media reports. Recent days use preliminary NWS Local Storm Reports via the Iowa Environmental Mesonet until NOAA publishes final data. Only reported hail is counted, so areas with fewer people tend to have fewer reports.