Hail history for Grundy County, Iowa
Every NOAA hail report filed in Grundy County since 1960, with preliminary National Weather Service reports to November 3, 2026.
Readout · Grundy County
- Last hail
- Sep 22, 2025
- 1.00 in, quarter size
- Hail days, last 5 years
- 5
- since Nov 3, 2021 · 6 reports
- Largest ever
- 3.00 in
- teacup · May 31, 1971
91 reports on 61 days since 1960 · #92 of 100 Iowa counties
Hail map · Grundy County
- 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 Grundy County is from September 22, 2025. A local roofer can check and document it at no cost.
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What the record says about Grundy County
The latest hail report in Grundy County is from September 22, 2025, 1.00 in (quarter size). Since November 3, 2021 there have been 5 separate hail days; the biggest stones in that time were 1.50 in on August 19, 2022.
Over the 20 years 2006–2025, Grundy County logged 46 reports on 30 hail days, about 2.3 reports a year. That is 38% less than the median Iowa county (3.7 a year) and ranks #92 of 100 Iowa counties for all-time reports. Grundy County holds 1% of all 16,032 hail reports in Iowa.
7% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Iowa county. The largest hail on record here is 3.00 in (teacup) on May 31, 1971.
Reports were down 52% in 2016–2025 (15) compared with 2006–2015 (31). The busiest year was 2006, with 10 reports on 2 days. Hail here peaks in May (31% of reports); 80% fall between April and June.
Reports a year 2006–2025 average
- Grundy County 2.3
- Median Iowa county 3.7
Hail days 2006–2025
- Grundy County 30
- Median Iowa county 39.5
Share 2 in or larger of sized reports
- Grundy County 7%
- Median Iowa county 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 1 | 1 | |||||||||||
| 2024 | 1 | 1 | |||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 1 | 2 | 3 | ||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 1 | 1 | 2 | ||||||||||
| 2018 | 1 | 3 | 1 | 5 | |||||||||
| 2017 | 1 | 1 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| Sep 22, 2025 | 1 | 1.00 in | — |
| May 19, 2024 | 1 | 1.00 in | — |
| Jul 28, 2023 | 1 | 1.00 in | — |
| Aug 19, 2022 | 2 | 1.50 in | — |
| Jun 15, 2022 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | Damage | Time · source |
|---|---|---|---|---|
| May 31, 1971 | 3.00 inteacup | — | — | 17:45 local · NCEI |
| Aug 9, 2009 | 2.50 intennis ball | Wellsburg | $250K | 09:55 local · NCEI |
| May 10, 2001 | 2.00 inhen egg | Beaman | $20K | 16:02 local · NCEI |
| May 10, 2001 | 2.00 inhen egg | Conrad | $30K | 16:00 local · NCEI |
| Jun 17, 1984 | 2.00 inhen egg | — | — | 14:35 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 40 44%
- 1–2 in 45 49%
- 2 in + 6 7%
Most recent reports
| Date | Size | Location | Time · source |
|---|---|---|---|
| Sep 22, 2025 | 1.00 inquarter | 2.76 S Dike | 19:25 local · NCEI |
| May 19, 2024 | 1.00 inquarter | 0.69 S Dike | 18:10 local · NCEI |
| Jul 28, 2023 | 1.00 inquarter | 3.06 W Holland | 17:48 local · NCEI |
| Aug 19, 2022 | 1.00 inquarter | 0.86 NE Holland | 14:56 local · NCEI |
| Aug 19, 2022 | 1.50 inping pong ball | 1.23 NE Holland | 14:50 local · NCEI |
| Jun 15, 2022 | 1.00 inquarter | 0.69 S Dike | 02:00 local · NCEI |
| Jul 11, 2020 | 1.00 inquarter | 3.43 NW Fern | 15:39 local · NCEI |
| Jun 28, 2019 | 1.00 inquarter | 2.58 NW Dike | 06:58 local · NCEI |
| May 31, 2019 | 1.00 inquarter | 0.22 WNW Reinbeck | 17:32 local · NCEI |
| Aug 5, 2018 | 1.00 inquarter | 0.86 SW Grundy Center | 19:01 local · NCEI |
| Jun 9, 2018 | 0.88 innickel | 0.69 S Grundy Center | 20:35 local · NCEI |
| Jun 6, 2018 | 1.00 inquarter | 0.51 E Conrad | 16:40 local · NCEI |
Cities and towns in Grundy County
| Place | Reports | Largest |
|---|---|---|
| Conrad | 17 | 2.75 in |
| Grundy Center | 16 | 1.75 in |
| Dike | 15 | 1.75 in |
| Holland | 10 | 1.50 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 |
|---|---|---|---|
| Reinbeck | 7 | 7 | May 31, 2019 |
| Beaman | 4 | 4 | Jun 14, 2008 |
| Wellsburg | 4 | 4 | May 4, 2015 |
| Whitten | 3 | 3 | May 25, 2018 |
| Stout | 2 | 2 | Jun 19, 2002 |
Questions about hail in Grundy County
How often does it hail in Grundy County, Iowa?
91 hail reports have been logged in Grundy County since 1960. Over the 20 years 2006–2025 that averages 2.3 reports a year. That ranks #92 of 100 Iowa counties by number of reports.
When is hail season in Grundy County?
Most reports come in May, April, June. May alone accounts for 31% of all reports.
What is the largest hail recorded in Grundy County?
3.00 in (teacup size) on May 31, 1971. 7% of reports here were 2 inches or larger.
When did it last hail in Grundy County?
The most recent report in this data is from September 22, 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 Grundy County had in the last five years?
5 separate days with hail reports since November 3, 2021, adding up to 6 reports. The most recent was September 22, 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.