Contra Costa County tornado history
4 tornadoes touched Contra Costa County, California between 1950 and 2025 — about 0.1 a year. The strongest was rated EF1 (Jan 23, 2010).
4tornadoes since 1950
EF1strongest rating
0killed · 0 injured
1.6 milongest path · 2010
(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5· dots = start point only
By rating
(E)F03
(E)F11
(E)F20
(E)F30
(E)F40
(E)F50
By month
JFMAMJJASOND
Peak month: January.
By decade
’50’60’70’80’90’00’10’20
Strongest tornadoes
| Date | Rating | Path | Width | Injured | Killed |
|---|
| Jan 23, 2010 | EF1 | 1.6 mi | 2 yd | 0 | 0 |
| Dec 5, 1998 | F0 | 1.5 mi | 150 yd | 0 | 0 |
| Sep 18, 1989 | F0 | 0.2 mi | 10 yd | 0 | 0 |
| Feb 19, 1998 | F0 | 0.2 mi | 30 yd | 0 | 0 |
Most recent tornadoes
| Date | Rating | Path | Width | Injured | Killed |
|---|
| Jan 23, 2010 | EF1 | 1.6 mi | 2 yd | 0 | 0 |
| Dec 5, 1998 | F0 | 1.5 mi | 150 yd | 0 | 0 |
| Feb 19, 1998 | F0 | 0.2 mi | 30 yd | 0 | 0 |
| Sep 18, 1989 | F0 | 0.2 mi | 10 yd | 0 | 0 |
Nearby counties
Questions
How many tornadoes has Contra Costa County, California had?
4 tornadoes touched Contra Costa County, California between 1950 and 2025 in the NOAA Storm Prediction Center database — about 0.1 per year.
What was the strongest tornado in Contra Costa County?
The strongest rating recorded was EF1 on Jan 23, 2010, with a 1.6-mile path.
When is tornado season in Contra Costa County?
Most of its tornadoes happened in January (1 of 4). Tornadoes can occur in any month, so keep alerts on year-round.
Right now: live tornado warnings map · alerts for your location. Dates link to that day’s full storm reports where available (2004 onward).