Hail history for Riverton, Wyoming
NOAA hail reports in and within about 5 km (3 miles) of Riverton since 1973, with preliminary reports to November 3, 2026.
Readout · Riverton
- Last hail
- May 26, 2023
- 1.00 in, quarter size
- Hail days, last 5 years
- 1
- since Nov 3, 2021 · 1 report
- Largest ever
- 1.75 in
- golf ball · Aug 17, 2003
16 reports on 12 days since 1973 · #42 of 61 Wyoming places
Hail map · Riverton
- 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 Riverton is from May 26, 2023. A local roofer can check and document it at no cost.
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What the record says about Riverton
The latest hail report in and around Riverton is from May 26, 2023, 1.00 in (quarter size). Since November 3, 2021 there has been one hail day; the biggest stones in that time were 1.00 in on May 26, 2023.
Over the 20 years 2006–2025, Riverton logged 6 reports on 5 hail days, about 0.3 reports a year. That is about half the median Wyoming town on this site (0.7 a year) and ranks #42 of 61 Wyoming cities and towns on this site for all-time reports. Riverton accounts for 12% of the 138 reports filed in Fremont County.
0% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median Wyoming town on this site. The largest hail on record here is 1.75 in (golf ball) on August 17, 2003 near Riverton.
The busiest year was 2003, with 4 reports on 1 day. Hail here peaks in August (31% of reports); 31% fall between April and June.
Reports a year 2006–2025 average
- Riverton 0.3
- Fremont County 3.6
- Median Wyoming town on this site 0.7
Hail days 2006–2025
- Riverton 5
- Fremont County 48
- Median Wyoming town on this site 11
Share 2 in or larger of sized reports
- Riverton 0%
- Fremont County 1%
- Median Wyoming town on this site 7%
Hail over time
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 0 | ||||||||||||
| 2025 | 0 | ||||||||||||
| 2024 | 0 | ||||||||||||
| 2023 | 1 | 1 | |||||||||||
| 2022 | 0 | ||||||||||||
| 2021 | 0 | ||||||||||||
| 2020 | 1 | 1 | |||||||||||
| 2019 | 0 | ||||||||||||
| 2018 | 0 | ||||||||||||
| 2017 | 0 |
Hail days since Nov 3, 2021
| Date | Reports | Largest | Storm page |
|---|---|---|---|
| May 26, 2023 | 1 | 1.00 in | — |
Largest hail on record
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| Aug 17, 2003 | 1.75 ingolf ball | Riverton | Fremont | 17:55 local · NCEI |
| Aug 17, 2003 | 1.25 inhalf dollar | Riverton | Fremont | 17:55 local · NCEI |
| Sep 10, 1988 | 1.25 inhalf dollar | — | Fremont | 13:55 local · NCEI |
| May 26, 2023 | 1.00 inquarter | 4.1 ESE Riverton | Fremont | 14:40 local · NCEI |
| Jul 2, 2008 | 1.00 inquarter | 1.15 ESE Riverton | Fremont | 20:35 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 6 38%
- 1–2 in 10 63%
- 2 in + 0 0%
Most recent reports
| Date | Size | Location | County | Time · source |
|---|---|---|---|---|
| May 26, 2023 | 1.00 inquarter | 4.1 ESE Riverton | Fremont | 14:40 local · NCEI |
| May 30, 2020 | 0.88 innickel | 1 NNE Riverton | Fremont | 16:00 local · NCEI |
| Sep 17, 2013 | 0.75 inpenny | 1.94 SSE Riverton | Fremont | 14:24 local · NCEI |
| Aug 15, 2009 | 0.88 innickel | 0.31 NW Riverton | Fremont | 18:04 local · NCEI |
| Jul 2, 2008 | 1.00 inquarter | 1.15 ESE Riverton | Fremont | 20:35 local · NCEI |
| Jul 2, 2008 | 0.88 innickel | Riverton | Fremont | 20:30 local · NCEI |
| Sep 24, 2005 | 1.00 inquarter | Riverton | Fremont | 21:59 local · NCEI |
| Aug 17, 2003 | 0.88 innickel | Riverton | Fremont | 18:00 local · NCEI |
| Aug 17, 2003 | 1.25 inhalf dollar | Riverton | Fremont | 17:55 local · NCEI |
| Aug 17, 2003 | 1.75 ingolf ball | Riverton | Fremont | 17:55 local · NCEI |
| Aug 17, 2003 | 1.00 inquarter | 1 W Riverton | Fremont | 17:52 local · NCEI |
| Jun 13, 1998 | 1.00 inquarter | 2 S Riverton | Fremont | 17:37 local · NCEI |
Hail history near Riverton
- Arapahoe 7 km · 15
- Lander 36 km · 18
- Fort Washakie 44 km · 10
Questions about hail in Riverton
How often does it hail in Riverton, Wyoming?
16 hail reports have been logged in and within about 5 km (3 miles) of Riverton since 1973. Over the 20 years 2006–2025 that averages 0.3 reports a year. That ranks #42 of 61 Wyoming places by number of reports.
When is hail season in Riverton?
Most reports come in August, September, May. August alone accounts for 31% of all reports.
What is the largest hail recorded in Riverton?
1.75 in (golf ball size) on August 17, 2003 near Riverton. 0% of reports here were 2 inches or larger.
When did it last hail in Riverton?
The most recent report in this data is from May 26, 2023 (1.00 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.
How many hail storms has Riverton had in the last five years?
1 separate days with hail reports since November 3, 2021, adding up to 1 reports. The most recent was May 26, 2023.
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.