Data current as of 2026-10-16 · Sourced from NOAA Storm Events
Over the past five years, the National Oceanic and Atmospheric Administration has recorded 208 hail storms within 25 miles of Longmont, CO. Of those, 147 produced hail at least quarter-size — the threshold most insurance carriers consider potentially damaging to asphalt shingles. The largest reported hail in this window was egg-sized, which can fracture shingle mat and dent metal flashing on contact. 2025 was the most active year on record locally, with 59 documented hail events.
Check Hail History for a Specific Address in Longmont| Severity | Count | What it means for roofs |
|---|---|---|
| Destructive | 8 events | Egg-size, expect mat fractures and gutter damage |
| Severe | 31 events | Ping pong-size, granule loss and bruising common |
| Significant | 108 events | Quarter-size, the standard insurance damage threshold |
| Moderate | 61 events | Marble-size, possible cosmetic damage |
| Year | Reported Hail Events Within 25 mi |
|---|---|
| 2026 | 34 events |
| 2025 | 59 events |
| 2024 | 55 events |
| 2023 | 47 events |
| 2022 | 13 events |
2025 was the busiest hail year on record locally for Longmont, with 59 documented events inside the 25-mile radius. Storm activity in Longmont typically peaks in spring and early summer, when the jet stream pushes Gulf moisture into the area and supercell thunderstorms become more frequent.
| Date | Location | Severity | Size | NOAA Comments |
|---|---|---|---|---|
| 2026-08-22 | Brighton, CO | Significant | 1.25" | Time estimated from radar. |
| 2026-08-22 | 1 SE Brighton, CO | Significant | 1.00" | Time estimated from radar. |
| 2026-08-22 | 1 W Fort Lupton, CO | Significant | 1.00" | Report from mPING: Quarter (1.00 in.). |
| 2026-07-28 | 4 W Pinewood Springs, CO | Moderate | 0.75" | Report from mPING: Dime (0.75 in.). |
| 2026-07-02 | 1 E Johnstown, CO | Significant | 1.25" | Hail was 2 to 3 inches deep covering the road. |
| 2026-07-02 | 2 NE Johnstown, CO | Significant | 1.00" | Report from mPING: Quarter (1.00 in.). |
| 2026-07-02 | 1 E Johnstown, CO | Significant | 1.25" | — |
| 2026-06-26 | Westminster, CO | Significant | 1.00" | Report from mPING: Quarter (1.00 in.). |
| 2026-06-26 | BROOMFIELD, CO | Significant | 1.00" | — |
| 2026-06-26 | FEDERAL HGT, CO | Significant | 1.00" | The report was from mPing. |
| 2026-06-26 | 1 SSW Westminster, CO | Significant | 1.00" | — |
| 2026-06-26 | 2 ESE Broomfield, CO | Significant | 1.00" | — |
| 2026-06-26 | NORTHGLENN, CO | Significant | 1.00" | — |
| 2026-06-25 | 1 W Berthoud, CO | Severe | 1.50" | — |
| 2026-06-25 | 1 SE Berthoud, CO | Severe | 1.75" | — |
| 2026-06-25 | Berthoud, CO | Severe | 1.75" | Time estimated by radar. |
| 2026-06-25 | 1 NNW Berthoud, CO | Severe | 1.50" | — |
| 2026-06-24 | BERTHOUD, CO | Severe | 1.50" | — |
| 2026-06-24 | BERTHOUD, CO | Severe | 1.50" | — |
| 2026-06-24 | BERTHOUD, CO | Severe | 1.75" | — |
NOAA has recorded 30 high-wind events within 25 miles of Longmont, CO in the past five years. Of those, 30 reached severe-thunderstorm thresholds (58+ mph). The highest measured gust was 90 mph.
| Severity | Count |
|---|---|
| Severe | 10 events |
| Significant | 20 events |
| Date | Location | Gust (mph) | Severity | NOAA Comments |
|---|---|---|---|---|
| 2026-08-30 | 3 N White Ranch Open Sp, CO | 60 | Significant | — |
| 2026-08-30 | 3 SW Rocky Flats, CO | 60 | Significant | — |
| 2026-07-28 | 3 SSE Pinewood Springs, CO | 55 | Significant | Personal weather station. |
| 2026-07-28 | 4 SW Carter Lake, CO | 58 | Significant | Personal weather station. |
| 2026-07-24 | 4 SSW Rocky Flats, CO | 61 | Significant | Mesonet station TT867 Arvada. |
| 2026-07-24 | 3 SW Rocky Flats, CO | 70 | Severe | Mesonet station CO109 Rocky Flats Hwy 93 and 72. |
| 2026-07-24 | 3 NNE White Ranch Open, CO | 61 | Significant | Mesonet station UP709 Clayws. |
| 2026-07-24 | 4 NE Loveland, CO | 59 | Significant | — |
| 2026-07-24 | 2 S Loveland, CO | 63 | Significant | — |
| 2025-07-10 | JEFFERSON CO ARPT, CO | 64 | Severe | The wind gust occurred at the National Wind Technology Center. |
| 2025-07-10 | GOLDEN, CO | 64 | Severe | — |
| 2025-07-08 | WESTMINSTER, CO | 49 | Significant | Report via social media. Measured a 50 mph gust using a handheld anemometer. A few trees down along with numerous 1-3 inch diameter branches. |
| 2025-06-17 | NORTHGLENN, CO | 60 | Significant | A 8 to 10 inch diameter tree downed. |
| 2024-07-20 | ERIE, CO | 60 | Significant | — |
| 2024-07-20 | BERTHOUD, CO | 64 | Severe | — |
| 2024-07-20 | CAMPION, CO | 60 | Significant | Broadcast media source provided photos of flattened and shredded crops from a combination of wind and hail at a malthouse east of Campion. |
| 2024-07-20 | NIWOT, CO | 61 | Significant | — |
| 2024-07-20 | BERTHOUD, CO | 58 | Significant | — |
| 2024-07-20 | DACONO, CO | 64 | Severe | — |
| 2024-07-20 | BROOMFIELD, CO | 58 | Significant | Measured gust from a CDOT sensor at I-25 and Highway 7. |
The most recent quarter-size-or-larger hail storm recorded by NOAA within 25 miles of Longmont was on August 22, 2026. HailCheck refreshes from the NOAA Storm Events database daily, so newer events appear here as they are reported.
Longmont averages roughly 42 reported hail events per year within a 25-mile radius. Significant storms (quarter-size or larger) account for 147 of the 208 events recorded over the last five years.
The largest documented hail near Longmont in the last five years was egg-sized. Most Longmont-area hail falls in the marble-to-quarter range, with destructive storms (egg-size or larger) appearing roughly once every few years.
Most homeowners insurance policies in CO cover hail damage to roofs, siding, and gutters under the dwelling and other-structures coverage. Coverage typically requires the damage to be tied to a verifiable storm date — which is where the NOAA hail history above (and a HAAG-style test square validation) becomes important for the claim file.
Use the HailCheck address search to enter any street address in or near Longmont. HailCheck returns every NOAA hail event within a configurable radius, along with severity bands, dates, and storm narratives for Pro members.
If your property in or near Longmont took on hail during one of the storms above, the standard process for documenting damage is a 10×10 foot test square inspection. A HAAG-trained reviewer counts impact indicators — granule displacement, mat fractures, and bruising — within the marked square and produces a PASS or FAIL document for the claim file.
HailCheck offers a $99 photo-based HAAG-style test square validation. You submit photos from the field, our reviewer evaluates the impact indicators and cross-references the NOAA storm dates listed above, and a written PASS/FAIL determination is returned within one business day. We do not send anyone to the roof — the validation is built around the photos you submit.
Learn About $99 HAAG-Style ValidationLongmont sits inside the central United States hail belt, where warm Gulf moisture collides with cold continental air to produce supercell thunderstorms capable of dropping the hail documented above. Properties in this zone typically see at least one significant hail event every two to four years.