Hail History

Hail history for Keystone, South Dakota

NOAA hail reports in and within about 5 km (3 miles) of Keystone since 1970, with preliminary reports to November 3, 2026.

Readout · Keystone

Last hail
Jul 3, 2026
1.25 in, half dollar size
Hail days, last 5 years
6
since Nov 3, 2021 · 10 reports
Largest ever
3.00 in
teacup · Jun 13, 1996

117 reports on 83 days since 1970 · #5 of 305 South Dakota places

Hail map · Keystone

Keystone Hill City Colonial Pine Hills Custer Hermosa Johnson Siding Rapid City Blackhawk Fairburn 25 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
117 most recent reports with a location; Pennington County is shaded. Open street map

For homeowners

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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 Keystone is from July 3, 2026. A local roofer can check and document it at no cost.

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What the record says about Keystone

The latest hail report in and around Keystone is from July 3, 2026, 1.25 in (half dollar size). Since November 3, 2021 there have been 6 separate hail days; the biggest stones in that time were 1.75 in on June 24, 2024.

Over the 20 years 2006–2025, Keystone logged 62 reports on 42 hail days, about 3.1 reports a year. That is 6.9 times the median South Dakota town on this site (0.5 a year) and ranks #5 of 305 South Dakota cities and towns on this site for all-time reports. Keystone accounts for 7% of the 1,654 reports filed in Pennington County.

8% of reports with a size were 2 inches (hen egg) or larger, against 7% for the median South Dakota town on this site. The largest hail on record here is 3.00 in (teacup) on June 13, 1996 near 2 N Keystone.

Reports held about level in 2016–2025 (31) compared with 2006–2015 (31). The busiest year was 2003, with 11 reports on 8 days. Hail here peaks in July (43% of reports); 40% fall between April and June.

Reports a year 2006–2025 average

  • Keystone 3.1
  • Pennington County 55.0
  • Median South Dakota town on this site 0.5

Hail days 2006–2025

  • Keystone 42
  • Pennington County 308
  • Median South Dakota town on this site 7

Share 2 in or larger of sized reports

  • Keystone 8%
  • Pennington County 11%
  • Median South Dakota town on this site 7%

Hail over time

051015 1970: 1 reports, largest 2.00 in 1970 1976: 1 reports, largest 1.75 in 1977: 1 reports, largest 1.75 in 1980 1983: 1 reports, largest 2.50 in 1985: 1 reports, largest 1.75 in 1990: 1 reports, largest 0.75 in 1990 1991: 1 reports, largest 0.75 in 1992: 3 reports, largest 1.50 in 1996: 8 reports, largest 3.00 in 1999: 4 reports, largest 1.00 in 2000: 2 reports, largest 0.75 in 2000 2001: 5 reports, largest 2.00 in 2002: 4 reports, largest 1.75 in 2003: 11 reports, largest 1.75 in 2004: 6 reports, largest 1.75 in 2005: 4 reports, largest 1.75 in 2006: 2 reports, largest 1.00 in 2007: 3 reports, largest 1.00 in 2008: 4 reports, largest 1.00 in 2009: 4 reports, largest 1.00 in 2010: 1 reports, largest 0.75 in 2010 2011: 1 reports, largest 1.00 in 2013: 4 reports, largest 2.00 in 2014: 5 reports, largest 1.75 in 2015: 7 reports, largest 1.75 in 2016: 7 reports, largest 1.75 in 2017: 1 reports, largest 1.50 in 2018: 4 reports, largest 1.75 in 2019: 1 reports, largest 0.75 in 2020: 5 reports, largest 2.50 in 2020 2021: 4 reports, largest 2.25 in 2022: 2 reports, largest 1.75 in 2023: 4 reports, largest 1.50 in 2024: 3 reports, largest 1.75 in 2026: 1 reports, largest 1.25 in
Reports per year, 1970–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
0204060 Jan Feb March: 1 reports (1%) Mar Apr May: 11 reports (9%) May June: 36 reports (31%) Jun July: 50 reports (43%) Jul August: 14 reports (12%) Aug September: 5 reports (4%) Sep Oct Nov Dec
All 117 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 1 1
2025 0
2024 12 3
2023 13 4
2022 2 2
2021 4 4
2020 14 5
2019 1 1
2018 112 4
2017 1 1

Hail days since Nov 3, 2021

DateReportsLargestStorm page
Jul 3, 2026 1 1.25 in —
Jun 24, 2024 2 1.75 in —
May 26, 2024 1 0.75 in —
Aug 12, 2023 3 1.00 in —
Jul 11, 2023 1 1.50 in —
Jun 11, 2022 2 1.75 in —

Largest hail on record

Largest hail reports in Keystone
Date Size Location County Damage Time · source
Jun 13, 1996 3.00 inteacup 2 N Keystone Pennington $2K 15:17 local · NCEI
Jul 9, 2020 2.50 intennis ball 2 W Hayward Pennington — 14:50 local · NCEI
Jun 13, 1996 2.50 intennis ball 2 SW Rockerville Pennington $5K 14:45 local · NCEI
Jul 29, 1983 2.50 intennis ball — Pennington — 17:10 local · NCEI
Jul 16, 2021 2.25 inhen egg 2 W Hayward Pennington — 15:50 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

Most recent reports

Most recent hail reports in Keystone
Date Size Location County Time · source
Jul 3, 2026 1.25 inhalf dollar 0.85 NE Mt Rushmore Pennington 16:00 local · NCEI
Jun 24, 2024 1.75 ingolf ball Keystone Pennington 17:54 local · NCEI
Jun 24, 2024 1.25 inhalf dollar 1 N Mt Rushmore Pennington 17:51 local · NCEI
May 26, 2024 0.75 inpenny Mt Rushmore Pennington 10:14 local · NCEI
Aug 12, 2023 1.00 inquarter Keystone Pennington 19:32 local · NCEI
Aug 12, 2023 0.75 inpenny Keystone Pennington 19:31 local · NCEI
Aug 12, 2023 0.75 inpenny Keystone Pennington 14:35 local · NCEI
Jul 11, 2023 1.50 inping pong ball 2 WSW Rockerville Pennington 21:34 local · NCEI
Jun 11, 2022 1.75 ingolf ball Mt Rushmore Pennington 21:46 local · NCEI
Jun 11, 2022 1.00 inquarter Keystone Pennington 21:45 local · NCEI
Jul 16, 2021 1.50 inping pong ball 9.49 W Hermosa Custer 16:02 local · NCEI
Jul 16, 2021 2.25 inhen egg 2 W Hayward Pennington 15:50 local · NCEI

Hail history near Keystone

Questions about hail in Keystone

How often does it hail in Keystone, South Dakota?

117 hail reports have been logged in and within about 5 km (3 miles) of Keystone since 1970. Over the 20 years 2006–2025 that averages 3.1 reports a year. That ranks #5 of 305 South Dakota places by number of reports.

When is hail season in Keystone?

Most reports come in July, June, August. July alone accounts for 43% of all reports.

What is the largest hail recorded in Keystone?

3.00 in (teacup size) on June 13, 1996 near 2 N Keystone. 8% of reports here were 2 inches or larger.

When did it last hail in Keystone?

The most recent report in this data is from July 3, 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 Keystone had in the last five years?

6 separate days with hail reports since November 3, 2021, adding up to 10 reports. The most recent was July 3, 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.