Ontario, CA Tornado History — 27 Tornadoes Since 1950
How many tornadoes has Ontario, CA had?
Ontario has had 27 tornadoes on record within 25 miles since 1950.
When was the most recent tornado near Ontario?
The most recent tornado within 25 miles of Ontario was an EF0 on March 13, 2025.
When is tornado season in Ontario?
February is historically the peak month for tornadoes near Ontario, with 6 on record. April through June account for 5 of the 27 tornadoes on record near Ontario.
At a Glance
Recent Tornado Activity Near Ontario
The last 20 years of confirmed tornadoes within 25 miles — 4 total, averaging 0.2 per year over this window.
What storm spotters reported near Ontario
One local storm report has been filed within 25 miles of Ontario and since confirmed into the NOAA archive, the earliest on May 9, 2025 and the most recent on May 9, 2025. It is already counted in the Ontario totals above; quoted below is the narrative the reporting office filed at the time.
[Landspout] Time of occurrence is approximate. Dust devil did damage to a carport. (SGX)
Source: National Weather Service and trained-spotter local storm reports, relayed by the NOAA Storm Prediction Center.
Tornadoes by Decade
Tornadoes by Enhanced Fujita Rating
F0–F5 ratings (pre-2007) are grouped with their EF equivalents. The Enhanced Fujita scale replaced the original Fujita scale in February 2007.
Tornadoes by Month
Have any tornadoes near Ontario been fatal?
No fatalities are on record within 25 miles of Ontario from any of the 27 tornadoes since 1950, though 5 injuries have been reported, according to NOAA Storm Prediction Center records.
Notable Tornadoes Near Ontario
What the record shows near Ontario
The 1990s were the busiest decade near Ontario, with 9 of the 27 confirmed tornadoes within 25 miles; the 2020s have produced 2 so far. The Ontario record runs from the 1950s to today.
Of the tornadoes rated near Ontario, 26 reached EF0 or EF1 and 1 reached EF2 or stronger. The most intense on record near Ontario is rated EF2, of which 1 is logged.
Across the last 20 years Ontario has averaged 0.2 confirmed tornadoes a year within 25 miles, 4 in total. 2008 was the busiest of them with 2, and 17 of those years passed with none at all.