Hail history for Rock County, Wisconsin
Every NOAA hail report filed in Rock County since 1961, with preliminary National Weather Service reports to November 3, 2026.
Readout · Rock County
- Last hail
- Jun 24, 2026
- 1.25 in, half dollar size
- Hail days, last 5 years
- 15
- since Nov 3, 2021 · 49 reports
- Largest ever
- 3.00 in
- teacup · Jun 4, 1975
174 reports on 104 days since 1961 · #13 of 73 Wisconsin counties
Hail map · Rock 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 Rock County
The latest hail report in Rock County is from June 24, 2026, 1.25 in (half dollar size). Since November 3, 2021 there have been 15 separate hail days; the biggest stones in that time were 2.75 in on April 18, 2025.
Over the 20 years 2006–2025, Rock County logged 101 reports on 56 hail days, about 5.0 reports a year. That is 44% more than the median Wisconsin county (3.5 a year) and ranks #13 of 73 Wisconsin counties for all-time reports. Rock County holds 2% of all 9,358 hail reports in Wisconsin.
9% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Wisconsin county. The largest hail on record here is 3.00 in (teacup) on June 4, 1975.
Reports were up 30% in 2016–2025 (57) compared with 2006–2015 (44). The busiest year was 2025, with 18 reports on 2 days. Hail here peaks in April (20% of reports); 52% fall between April and June.
Reports a year 2006–2025 average
- Rock County 5.0
- Median Wisconsin county 3.5
Hail days 2006–2025
- Rock County 56
- Median Wisconsin county 37
Share 2 in or larger of sized reports
- Rock County 9%
- Median Wisconsin county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 1 | 8 | 1 | 10 | |||||||||
| 2025 | 11 | 7 | 18 | ||||||||||
| 2024 | 1 | 3 | 1 | 5 | 10 | ||||||||
| 2023 | 2 | 2 | |||||||||||
| 2022 | 8 | 1 | 9 | ||||||||||
| 2021 | 1 | 3 | 4 | ||||||||||
| 2020 | 1 | 1 | 2 | ||||||||||
| 2019 | 1 | 1 | 2 | ||||||||||
| 2018 | 3 | 3 | |||||||||||
| 2017 | 2 | 1 | 3 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Jun 24, 2026 | 1 | 1.25 in | — |
| Apr 17, 2026 | 4 | 2.00 in | — |
| Apr 2, 2026 | 4 | 1.50 in | — |
| Mar 10, 2026 | 1 | 1.00 in | — |
| Aug 16, 2025 | 7 | 1.50 in | — |
| Apr 18, 2025 | 11 | 2.75 in | — |
| Jun 25, 2024 | 5 | 1.25 in | — |
| May 7, 2024 | 1 | 0.75 in | — |
| Mar 4, 2024 | 3 | 1.50 in | — |
| Feb 8, 2024 | 1 | 0.75 in | — |
| Apr 5, 2023 | 1 | 0.88 in | — |
| Apr 4, 2023 | 1 | 1.25 in | — |
| Sep 20, 2022 | 1 | 0.88 in | — |
| Jul 23, 2022 | 5 | 2.00 in | — |
| Jul 5, 2022 | 3 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 4, 1975 | 3.00 inteacup | — | 19:30 local · NCEI |
| Apr 18, 2025 | 2.75 inbaseball | 0.69 N Edgerton | 06:10 local · NCEI |
| Apr 18, 2025 | 2.75 inbaseball | 1.71 NW Fulton | 06:02 local · NCEI |
| Apr 18, 2025 | 2.75 inbaseball | 1.01 W Evansville | 06:00 local · NCEI |
| Apr 18, 2025 | 2.50 intennis ball | Edgerton | 06:08 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 58 33%
- 1–2 in 101 58%
- 2 in + 15 9%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Jun 24, 2026 | 1.25 inhalf dollar | 2.14 ESE Milton | 14:46 local · NCEI |
| Apr 17, 2026 | 2.00 inhen egg | 0.51 E Beloit | 17:29 local · NCEI |
| Apr 17, 2026 | 1.75 ingolf ball | 0.69 N Milton | 17:23 local · NCEI |
| Apr 17, 2026 | 1.75 ingolf ball | 0.51 E Beloit | 17:16 local · NCEI |
| Apr 17, 2026 | 1.50 inping pong ball | 0.51 W Downtown Janesville | 17:12 local · NCEI |
| Apr 2, 2026 | 0.88 innickel | 3.49 N Downtown Janesville | 18:07 local · NCEI |
| Apr 2, 2026 | 0.75 inpenny | 2.63 ENE Downtown Janesville | 17:27 local · NCEI |
| Apr 2, 2026 | 1.50 inping pong ball | 2.15 NNE Downtown Janesville | 17:22 local · NCEI |
| Apr 2, 2026 | 1.25 inhalf dollar | 0.78 NW Downtown Janesville | 17:19 local · NCEI |
| Mar 10, 2026 | 1.00 inquarter | 0.69 S Beloit | 19:10 local · NCEI |
| Aug 16, 2025 | 1.00 inquarter | 0.86 SE Clinton | 13:40 local · NCEI |
| Aug 16, 2025 | 1.50 inping pong ball | Clinton | 13:40 local · NCEI |
Cities and towns in Rock County
| Place | Reports | Largest |
|---|---|---|
| Janesville | 48 | 2.25 in |
| Edgerton | 27 | 2.75 in |
| Beloit | 20 | 2.00 in |
| Evansville | 18 | 2.75 in |
| Lake Koshkonong | 15 | 2.00 in |
| Milton | 13 | 1.75 in |
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 |
|---|---|---|---|
| Orfordville | 8 | 7 | Apr 5, 2023 |
| Clinton | 6 | 5 | Aug 16, 2025 |
| Footville | 3 | 3 | Jul 18, 2012 |
| Fulton | 1 | 1 | Apr 18, 2025 |
| Hanover | 1 | 1 | Oct 29, 2004 |
Questions about hail in Rock County
How often does it hail in Rock County, Wisconsin?
174 hail reports have been logged in Rock County since 1961. Over the 20 years 2006–2025 that averages 5.0 reports a year. That ranks #13 of 73 Wisconsin counties by number of reports.
When is hail season in Rock County?
Most reports come in April, May, August. April alone accounts for 20% of all reports.
What is the largest hail recorded in Rock County?
3.00 in (teacup size) on June 4, 1975. 9% of reports here were 2 inches or larger.
When did it last hail in Rock County?
The most recent report in this data is from June 24, 2026 (1.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Rock County had in the last five years?
15 separate days with hail reports since November 3, 2021, adding up to 49 reports. The most recent was June 24, 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.