Hail history for Gunbarrel, Colorado
NOAA hail reports in and within about 5 km (3 miles) of Gunbarrel since 1977, with preliminary reports to November 3, 2026.
Readout · Gunbarrel
- Last hail
- Aug 10, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 2
- since Nov 3, 2021 · 4 reports
- Largest ever
- 2.50 in
- tennis ball · Jun 13, 1977
14 reports on 11 days since 1977 · #153 of 183 Colorado places
Hail map · Gunbarrel
- Under 1 in
- 1–1.75 in
- 1.75–2.5 in
- 2.5–4 in
- 4 in +
- No size
For homeowners
Roof damage after hail? Get a free inspection
Hail bruises shingles and cracks seals in ways you can't see from the ground, and most insurers set a claim deadline after the storm. The latest hail report in Gunbarrel is from August 10, 2025. A local roofer can check and document it at no cost.
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What the record says about Gunbarrel
The latest hail report in and around Gunbarrel is from August 10, 2025, 1.00 in (quarter size). Since November 3, 2021 there have been 2 separate hail days; the biggest stones in that time were 1.00 in on August 10, 2025.
Over the 20 years 2006–2025, Gunbarrel logged 8 reports on 6 hail days, about 0.4 reports a year. That is about half the median Colorado town on this site (0.8 a year) and ranks #153 of 183 Colorado cities and towns on this site for all-time reports. Gunbarrel accounts for 4% of the 357 reports filed in Boulder County.
14% of reports with a size were 2 inches (hen egg) or larger, against 8% for the median Colorado town on this site. The largest hail on record here is 2.50 in (tennis ball) on June 13, 1977.
Reports were up 67% in 2016–2025 (5) compared with 2006–2015 (3). The busiest year was 2025, with 4 reports on 2 days. Hail here peaks in August (36% of reports); 36% fall between April and June.
Reports a year 2006–2025 average
- Gunbarrel 0.4
- Boulder County 10.4
- Median Colorado town on this site 0.8
Hail days 2006–2025
- Gunbarrel 6
- Boulder County 66
- Median Colorado town on this site 11
Share 2 in or larger of sized reports
- Gunbarrel 14%
- Boulder County 7%
- Median Colorado town on this site 8%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 1 | 3 | 4 | ||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 0 | ||||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 0 | ||||||||||||
| 2019 | 1 | 1 | |||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Aug 10, 2025 | 3 | 1.00 in | — |
| Jul 11, 2025 | 1 | 0.75 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jun 13, 1977 | 2.50 intennis ball | — | Boulder | 16:20 local · NCEI |
| Aug 10, 2004 | 2.00 inhen egg | 10 N Hudson | Weld | 15:10 local · NCEI |
| Jul 5, 2019 | 1.50 inping pong ball | 2.98 ENE Boulder Arpt | Boulder | 18:58 local · NCEI |
| Jul 12, 1996 | 1.25 inhalf dollar | 7 NE Boulder | Boulder | 19:13 local · NCEI |
| Aug 10, 2025 | 1.00 inquarter | 2.81 S Niwot | Boulder | 18:13 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 9 64%
- 1–2 in 3 21%
- 2 in + 2 14%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Aug 10, 2025 | 1.00 inquarter | 2.81 S Niwot | Boulder | 18:13 local · NCEI |
| Aug 10, 2025 | 0.75 inpenny | 2.76 S Niwot | Boulder | 18:10 local · NCEI |
| Aug 10, 2025 | 0.88 innickel | 2.76 S Niwot | Boulder | 18:08 local · NCEI |
| Jul 11, 2025 | 0.75 inpenny | 2.76 S Niwot | Boulder | 17:10 local · NCEI |
| Jul 5, 2019 | 1.50 inping pong ball | 2.98 ENE Boulder Arpt | Boulder | 18:58 local · NCEI |
| Jul 28, 2009 | 0.75 inpenny | 2.07 S Niwot | Boulder | 20:00 local · NCEI |
| Apr 23, 2007 | 0.75 inpenny | 2.14 NNE Valmont | Boulder | 16:16 local · NCEI |
| Jun 24, 2006 | 0.88 innickel | 5 NE Boulder | Boulder | 16:45 local · NCEI |
| Aug 10, 2004 | 0.88 innickel | 4 ENE Boulder | Boulder | 19:03 local · NCEI |
| Aug 10, 2004 | 2.00 inhen egg | 10 N Hudson | Weld | 15:10 local · NCEI |
| Jun 22, 2003 | 0.75 inpenny | 8 ENE Boulder | Boulder | 19:24 local · NCEI |
| Jul 12, 1996 | 1.25 inhalf dollar | 7 NE Boulder | Boulder | 19:13 local · NCEI |
Hail history near Gunbarrel
- Niwot 4 km · 11
- Boulder 8 km · 85
- Lafayette 10 km · 38
- Louisville 11 km · 24
- Erie 12 km · 46
- Longmont 13 km · 89
- Broomfield 16 km · 48
- Frederick 17 km · 36
Questions about hail in Gunbarrel
How often does it hail in Gunbarrel, Colorado?
14 hail reports have been logged in and within about 5 km (3 miles) of Gunbarrel since 1977. Over the 20 years 2006–2025 that averages 0.4 reports a year. That ranks #153 of 183 Colorado places by number of reports.
When is hail season in Gunbarrel?
Most reports come in August, June, July. August alone accounts for 36% of all reports.
What is the largest hail recorded in Gunbarrel?
2.50 in (tennis ball size) on June 13, 1977. 14% of reports here were 2 inches or larger.
When did it last hail in Gunbarrel?
The most recent report in this data is from August 10, 2025 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Gunbarrel had in the last five years?
2 separate days with hail reports since November 3, 2021, adding up to 4 reports. The most recent was August 10, 2025.
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.