Hail History

Hail history for Sonoma County, California

Every NOAA hail report filed in Sonoma County since 2003, with preliminary National Weather Service reports to November 3, 2026.

Readout · Sonoma County

Last hail
Mar 10, 2021
0.25 in, pea size
Hail days, last 5 years
0
since Nov 3, 2021 · 0 reports
Largest ever
0.75 in
penny · Dec 9, 2003

21 reports on 12 days since 2003 · #19 of 47 California counties

Hail map · Sonoma County

20 mi
  • Under 1 in
  • 1–1.75 in
  • 1.75–2.5 in
  • 2.5–4 in
  • 4 in +
  • No size
21 most recent reports with a location. Dot size and colour follow hail size. Open street map

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 Sonoma County is from March 10, 2021. A local roofer can check and document it at no cost.

Phone line opening soon

What would a claim cost you? Try the hail claim calculator

Preview: this form is not connected yet. Nothing you enter is sent or stored.

Roofer? Get hail alerts for your area with StormScope

What the record says about Sonoma County

The latest hail report in Sonoma County is from March 10, 2021, 0.25 in (pea size). There has been no hail report here in the five years since November 3, 2021.

Over the 20 years 2006–2025, Sonoma County logged 20 reports on 11 hail days, about 1.0 reports a year. That is 2.5 times the median California county (0.4 a year) and ranks #19 of 47 California counties for all-time reports. Sonoma County holds 2% of all 938 hail reports in California.

0% of reports with a size were 2 inches (hen egg) or larger, against 0% for the median California county. The largest hail on record here is 0.75 in (penny) on December 9, 2003 near Guerneville.

Reports were up 2000% in 2016–2025 (20) compared with 2006–2015 (0). The busiest year was 2018, with 9 reports on 5 days. Hail here peaks in March (33% of reports); 10% fall between April and June.

Reports a year 2006–2025 average

  • Sonoma County 1.0
  • Median California county 0.4

Hail days 2006–2025

  • Sonoma County 11
  • Median California county 7

Share 2 in or larger of sized reports

  • Sonoma County 0%
  • Median California county 0%

Hail over time

0369 2003: 1 reports, largest 0.75 in 2005 2010 2015 2017: 3 reports, largest 0.25 in 2018: 9 reports, largest 0.25 in 2019: 2 reports, largest 0.25 in 2020: 5 reports, largest 0.25 in 2020 2021: 1 reports, largest 0.25 in 2025
Reports per year, 2003–2026. Bar colour shows the largest hail that year. Reporting grew sharply after the mid-1990s, so early decades undercount.
02468 January: 6 reports (29%) Jan February: 4 reports (19%) Feb March: 7 reports (33%) Mar Apr May June: 2 reports (10%) Jun Jul August: 1 reports (5%) Aug Sep Oct Nov December: 1 reports (5%) Dec
All 21 reports by calendar month.
Reports per month, 2017–2026. Darker cells had more reports.
YearJanFebMarAprMayJunJulAugSepOctNovDecTotal
2026 0
2025 0
2024 0
2023 0
2022 0
2021 1 1
2020 41 5
2019 2 2
2018 621 9
2017 12 3

Largest hail on record

Largest hail reports in Sonoma County
Date Size Location Time · source
Dec 9, 2003 0.75 inpenny Guerneville 23:15 local · NCEI
Mar 10, 2021 0.25 inpea Santa Rosa 10:00 local · NCEI
Aug 17, 2020 0.25 inpea 1 S Santa Rosa 07:01 local · NCEI
Mar 25, 2020 0.25 inpea 7 NNW Healdsburg 14:58 local · NCEI
Mar 25, 2020 0.25 inpea 1 NNW Petaluma 13:15 local · NCEI

Size of every report

Most recent reports

Most recent hail reports in Sonoma County
Date Size Location Time · source
Mar 10, 2021 0.25 inpea Santa Rosa 10:00 local · NCEI
Aug 17, 2020 0.25 inpea 1 S Santa Rosa 07:01 local · NCEI
Mar 25, 2020 0.25 inpea 7 NNW Healdsburg 14:58 local · NCEI
Mar 25, 2020 0.25 inpea 1 NNW Petaluma 13:15 local · NCEI
Mar 25, 2020 0.25 inpea 0.67 SE Cotati 13:10 local · NCEI
Mar 25, 2020 0.25 inpea 1 N Cloverdale 12:17 local · NCEI
Feb 15, 2019 0.25 inpea Occidental 10:35 local · NCEI
Feb 15, 2019 0.25 inpea 1 NW Windsor 08:07 local · NCEI
Mar 14, 2018 0.25 inpea Petaluma 10:40 local · NCEI
Feb 26, 2018 0.25 inpea Santa Rosa 15:38 local · NCEI
Feb 22, 2018 0.25 inpea 3 N Bodega 13:39 local · NCEI
Jan 25, 2018 0.25 inpea 1 E Petaluma 12:18 local · NCEI

Smaller places with fewer than 10 reports

These places have too few reports for a page of their own, so their record lives here.

PlaceReportsHail daysLatest
Petaluma64Mar 25, 2020
Santa Rosa55Mar 10, 2021
Occidental33Feb 15, 2019
Rohnert Park22Mar 25, 2020
Cloverdale11Mar 25, 2020
Geyserville11Mar 25, 2020
Guerneville11Dec 9, 2003
Larkfield-Wikiup11Mar 5, 2017
Windsor11Feb 15, 2019

Questions about hail in Sonoma County

How often does it hail in Sonoma County, California?

21 hail reports have been logged in Sonoma County since 2003. Over the 20 years 2006–2025 that averages 1.0 reports a year. That ranks #19 of 47 California counties by number of reports.

When is hail season in Sonoma County?

Most reports come in March, January, February. March alone accounts for 33% of all reports.

What is the largest hail recorded in Sonoma County?

0.75 in (penny size) on December 9, 2003 near Guerneville. 0% of reports here were 2 inches or larger.

When did it last hail in Sonoma County?

The most recent report in this data is from March 10, 2021 (0.25 in). Final NOAA data runs to July 31, 2026; preliminary NWS reports run to November 3, 2026.

How many hail storms has Sonoma County had in the last five years?

None: there has been no hail report in Sonoma County since November 3, 2021. The last one was on March 10, 2021.

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.