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 12 hail storms within 25 miles of Casper, WY. Of those, 9 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 5 documented hail events.
Check Hail History for a Specific Address in Casper| Severity | Count | What it means for roofs |
|---|---|---|
| Destructive | 2 events | Egg-size, expect mat fractures and gutter damage |
| Severe | 1 event | Ping pong-size, granule loss and bruising common |
| Significant | 6 events | Quarter-size, the standard insurance damage threshold |
| Moderate | 3 events | Marble-size, possible cosmetic damage |
| Year | Reported Hail Events Within 25 mi |
|---|---|
| 2026 | 1 event |
| 2025 | 5 events |
| 2023 | 5 events |
| 2022 | 1 event |
2025 was the busiest hail year on record locally for Casper, with 5 documented events inside the 25-mile radius. Storm activity in Casper 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 |
|---|---|---|---|---|
| 2026-07-06 | Casper, WY | Significant | 1.00" | Hailstones ranged from pea size to quarter size. |
| 2025-07-29 | MILLS, WY | Moderate | 0.88" | A trained spotter reported nickel size hail to the west of Mills. |
| 2025-07-29 | BAR NUNN, WY | Moderate | 0.88" | A trained spotter reported nickel size hail north of Bar Nunn. |
| 2025-06-16 | MILLS, WY | Significant | 1.00" | Trained spotters reported hail from the size of pennies to quarters from south of Mills to Casper Mountain. |
| 2025-06-16 | MILLS, WY | Destructive | 2.25" | The Natrona County Emergency Manager reported 2.25 inch hail to the northwest of Mills. |
| 2025-06-16 | (CPR)NATRONA CO ARPT, WY | Destructive | 2.00" | Government official reported egg size hail near the Natrona County Airport. |
| 2023-09-10 | (CPR)NATRONA CO ARPT, WY | Significant | 1.00" | A thunderstorm moved southeastward and brought local severe hail. Hail from penny to occasionally quarter size was reported from near Bar Nunn to southeast of Evansville. |
| 2023-07-14 | GLENROCK, WY | Significant | 1.25" | From Glenrock Police Department. Hail ranged from quarters to half dollar size. |
| 2023-07-14 | GLENROCK, WY | Significant | 1.00" | Twitter picture with a lot of hail stones. Largest were quarter size. |
| 2023-06-20 | BAR NUNN, WY | Severe | 1.75" | A trained spotter reported golf ball size hail to the west of Bar Nunn. |
| 2023-05-17 | MILLS, WY | Significant | 1.00" | A trained spotter reported quarter size hail to the west of Casper. |
| 2022-05-17 | (CPR)NATRONA CO ARPT, WY | Moderate | 0.88" | A trained spotter reported nickel size hail to the west of Casper. |
NOAA has recorded 90 high-wind events within 25 miles of Casper, WY in the past five years. Of those, 90 reached severe-thunderstorm thresholds (58+ mph). The highest measured gust was 86 mph.
| Severity | Count |
|---|---|
| Severe | 30 events |
| Significant | 60 events |
| Date | Location | Gust (mph) | Severity | NOAA Comments |
|---|---|---|---|---|
| 2026-09-18 | 3 SSE Casper, WY | 62 | Significant | Mesonet station PC377 Scenic Dr (PC). |
| 2026-09-18 | 13 SE Evansville, WY | 67 | Severe | Mesonet station PC459 Muddy Creek (PC). |
| 2026-09-18 | 14 N Bar Nunn, WY | 62 | Significant | Mesonet station KTMH I-25 Twenty Mile Hill (DOT). |
| 2026-08-28 | 6 NW Mills, WY | 67 | Severe | ASOS station KCPR Casper Airport (ASOS). |
| 2026-08-28 | 3 SSE Casper, WY | 55 | Significant | Mesonet station PC377 Scenic Dr (PC). |
| 2026-08-25 | 6 NW Mills, WY | 52 | Significant | ASOS station KCPR Casper Airport (ASOS). |
| 2026-08-10 | 6 NW Mills, WY | 78 | Severe | ASOS station KCPR Casper Airport (ASOS). |
| 2026-08-10 | 1 S Glenrock, WY | 59 | Significant | Mesonet station KDRC I-25 Glenrock (DOT). Multiple gusts at or above 58mph. |
| 2026-07-08 | 14 N Bar Nunn, WY | 64 | Severe | Mesonet station KTMH I-25 Twenty Mile Hill (DOT). |
| 2026-07-06 | 1 S Bar Nunn, WY | 59 | Significant | Mesonet station FW2904 Bar Nunn (CWOP). |
| 2026-06-30 | 1 SW Evansville, WY | 55 | Significant | Mesonet station GW4455 Evansville (CWOP). |
| 2026-06-29 | 11 SW Mills, WY | 56 | Significant | Mesonet station PC250 North Platte (PC). |
| 2026-06-29 | 7 S Casper, WY | 57 | Significant | Mesonet station PC391 Stag Run (PC). |
| 2026-06-29 | 4 SE Evansville, WY | 62 | Significant | Mesonet station WY61 I-25 Hat Six (DOT). |
| 2026-06-29 | 6 SE Casper, WY | 69 | Severe | Mesonet station PC392 Claude Creek (PC). |
| 2026-06-29 | 6 NW Mills, WY | 66 | Severe | ASOS station KCPR Casper Airport (ASOS). |
| 2026-06-29 | 2 SSE Casper, WY | 63 | Significant | Mesonet station WY47 WY258 Outer Drive (DOT). |
| 2026-06-29 | 2 SSE Casper, WY | 62 | Significant | Mesonet station WY47 WY258 Outer Drive (DOT). |
| 2026-06-29 | 3 SSE Casper, WY | 68 | Severe | Mesonet station PC377 Scenic Dr (PC). |
| 2026-06-29 | 13 SE Evansville, WY | 68 | Severe | Mesonet station PC459 Muddy Creek (PC). |
The most recent quarter-size-or-larger hail storm recorded by NOAA within 25 miles of Casper was on July 6, 2026. HailCheck refreshes from the NOAA Storm Events database daily, so newer events appear here as they are reported.
Casper averages roughly 2 reported hail events per year within a 25-mile radius. Significant storms (quarter-size or larger) account for 9 of the 12 events recorded over the last five years.
The largest documented hail near Casper in the last five years was egg-sized. Most Casper-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 WY 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 Casper. 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 Casper 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 ValidationCasper sits east of the traditional hail alley, where hail events are less frequent than the central plains but tend to be associated with strong squall lines and tropical systems. Local roof systems are less commonly hardened for hail, which can mean even moderate impacts produce claim-worthy damage.