Hail history for Longmont, Colorado
NOAA hail reports in and within about 5 km (3 miles) of Longmont since 1962, with preliminary reports to November 3, 2026.
Readout · Longmont
- Last hail
- Jul 20, 2024
- 0.75 in, penny size
- Hail days, last 5 years
- 3
- since Nov 3, 2021 · 6 reports
- Largest ever
- 2.75 in
- baseball · May 25, 1962
89 reports on 43 days since 1962 · #14 of 183 Colorado places
Hail map · Longmont
- 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 Longmont is from July 20, 2024. A local roofer can check and document it at no cost.
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What the record says about Longmont
The latest hail report in and around Longmont is from July 20, 2024, 0.75 in (penny size). Since November 3, 2021 there have been 3 separate hail days; the biggest stones in that time were 1.75 in on May 9, 2023.
Over the 20 years 2006–2025, Longmont logged 55 reports on 21 hail days, about 2.8 reports a year. That is 3.4 times the median Colorado town on this site (0.8 a year) and ranks #14 of 183 Colorado cities and towns on this site for all-time reports. Longmont accounts for 25% of the 357 reports filed in Boulder County.
2% 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 2.75 in (baseball) on May 25, 1962.
Reports were up 62% in 2016–2025 (34) compared with 2006–2015 (21). The busiest year was 2019, with 13 reports on 5 days. Hail here peaks in May (31% of reports); 61% fall between April and June.
Reports a year 2006–2025 average
- Longmont 2.8
- Boulder County 10.4
- Median Colorado town on this site 0.8
Hail days 2006–2025
- Longmont 21
- Boulder County 66
- Median Colorado town on this site 11
Share 2 in or larger of sized reports
- Longmont 2%
- 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 | 0 | ||||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 5 | 5 | |||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 1 | 1 | 2 | ||||||||||
| 2019 | 1 | 3 | 1 | 8 | 13 | ||||||||
| 2018 | 6 | 2 | 5 | 13 | |||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jul 20, 2024 | 1 | 0.75 in | — |
| May 26, 2023 | 2 | 1.25 in | — |
| May 9, 2023 | 3 | 1.75 in | — |
Largest hail on record
| Date | Size | Location | County | Damage | Time · source |
|---|---|---|---|---|---|
| May 25, 1962 | 2.75 inbaseball | — | Boulder | — | 14:30 local · NCEI |
| May 22, 2008 | 2.00 inhen egg | 2.22 WSW Liberty | Weld | — | 11:16 local · NCEI |
| May 9, 2023 | 1.75 ingolf ball | 0.53 W Longmont | Boulder | — | 21:51 local · NCEI |
| Jun 28, 2013 | 1.75 ingolf ball | 0.53 W Longmont | Boulder | — | 19:57 local · NCEI |
| Aug 2, 1986 | 1.75 ingolf ball | — | Boulder | —6 injured | 16:50 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 29 33%
- 1–2 in 58 65%
- 2 in + 2 2%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Jul 20, 2024 | 0.75 inpenny | 2.07 N Longmont | Boulder | 19:03 local · NCEI |
| May 26, 2023 | 1.25 inhalf dollar | 2.61 NE Longmont | Boulder | 13:35 local · NCEI |
| May 26, 2023 | 0.88 innickel | 0.87 NW Longmont | Boulder | 13:34 local · NCEI |
| May 9, 2023 | 1.75 ingolf ball | 0.53 W Longmont | Boulder | 21:51 local · NCEI |
| May 9, 2023 | 1.00 inquarter | 2.14 NNW Longmont | Boulder | 21:45 local · NCEI |
| May 9, 2023 | 1.00 inquarter | 2.33 SSE Longmont Muni Arpt | Boulder | 21:35 local · NCEI |
| Jul 31, 2020 | 1.00 inquarter | 1.48 SSW Longmont Muni Arpt | Boulder | 16:32 local · NCEI |
| Jun 8, 2020 | 0.75 inpenny | 2.81 S Longmont | Boulder | 21:37 local · NCEI |
| Sep 11, 2019 | 1.25 inhalf dollar | 1.74 NW Longmont | Boulder | 15:37 local · NCEI |
| Sep 11, 2019 | 1.00 inquarter | 1.73 WNW Longmont | Boulder | 15:34 local · NCEI |
| Sep 11, 2019 | 1.00 inquarter | 1.48 NNW Longmont | Boulder | 15:30 local · NCEI |
| Sep 11, 2019 | 1.00 inquarter | 0.87 NW Longmont | Boulder | 15:28 local · NCEI |
Hail history near Longmont
Questions about hail in Longmont
How often does it hail in Longmont, Colorado?
89 hail reports have been logged in and within about 5 km (3 miles) of Longmont since 1962. Over the 20 years 2006–2025 that averages 2.8 reports a year. That ranks #14 of 183 Colorado places by number of reports.
When is hail season in Longmont?
Most reports come in May, June, August. May alone accounts for 31% of all reports.
What is the largest hail recorded in Longmont?
2.75 in (baseball size) on May 25, 1962. 2% of reports here were 2 inches or larger.
When did it last hail in Longmont?
The most recent report in this data is from July 20, 2024 (0.75 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Longmont had in the last five years?
3 separate days with hail reports since November 3, 2021, adding up to 6 reports. The most recent was July 20, 2024.
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.