O'Fallon, MO Tornado History — 124 Tornadoes Since 1950
How many tornadoes has O'Fallon, MO had?
O'Fallon has had 124 tornadoes on record within 25 miles since 1950, including 13 violent (EF3+) tornadoes.
When was the most recent tornado near O'Fallon?
The most recent tornado within 25 miles of O'Fallon was an EF1 on June 4, 2025.
When is tornado season in O'Fallon?
May is historically the peak month for tornadoes near O'Fallon, with 25 on record. Spring through early summer (April–June) generally sees the highest activity across most of the central and southern United States.
At a Glance
Recent Tornado Activity Near O'Fallon
The last 20 years of confirmed tornadoes within 25 miles — 54 total, averaging 2.7 per year over this window.
Preliminary tornado reports near O'Fallon since December 29, 2025
These are 3 preliminary reports, not confirmed tornadoes. They have not yet been through an NWS damage survey, and are not counted in the confirmed totals above.
Preliminary reports are revised, merged, and sometimes withdrawn — historically about 23% are consolidated downward once surveys complete. Ratings are omitted until a survey assigns one.
Confirmed records above are complete through December 29, 2025. NOAA publishes the confirmed archive annually, so tornadoes after that date appear here first and move into the totals above once finalized.
Within 25 miles of O'Fallon. Source: NOAA Storm Prediction Center preliminary storm reports, updated daily.
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
Casualties on Record Near O'Fallon
39 fatalities have been recorded within 25 miles of O'Fallon since 1950, across 9 events. 765 injuries have been reported across all events. 1959 was the deadliest year on record.
The deadliest single event was a F4 on February 10, 1959, which caused 21 fatalities along a 23.9-mile track.
Notable Tornadoes Near O'Fallon
About Tornadoes in O'Fallon
This overview was written April 23, 2026. The tornado counts and notable-event figures elsewhere on this page reflect the latest data and may differ from this summary.
O'Fallon, Missouri has experienced significant tornado activity over the past seven decades. According to NOAA Storm Prediction Center records, 116 tornadoes have been documented within 25 miles of the city since 1950. The frequency of these events has varied considerably by decade, with 17 tornadoes recorded in the 1950s, followed by a decline to just 7 in the 1970s. Activity increased substantially in recent decades, with 29 tornadoes occurring in the 2010s and 16 already recorded in the 2020s through mid-2025.
The majority of tornadoes in the O'Fallon area have been relatively weak on the Enhanced Fujita scale, which rates tornado intensity based on damage. Of the 116 recorded events, 46 were rated EF0 and 43 were rated EF1, representing the lowest intensity categories. However, the area has also experienced more powerful storms: 16 tornadoes reached EF2 intensity, 8 reached EF3, and 3 achieved EF4 status. May has been the most active month historically, accounting for 23 tornado events, consistent with the spring severe weather season when atmospheric conditions across the central United States most favor tornadic thunderstorm development.
The deadliest tornado on record near O'Fallon was an F4 that struck on February 10, 1959, claiming 21 lives and causing $27.5 million in property damage along a 23.9-mile path with a maximum width of 200 yards. More recently, an EF2 tornado on May 16, 2025 became the costliest event in the area's history, causing $1.6 billion in property damage and 4 fatalities while traveling 23.2 miles with a maximum width of 1,750 yards.
On June 1, 2013, an EF3 tornado carved the longest and widest path recorded in the area, traveling 31.7 miles with a maximum width of 1,760 yards and causing $60 million in damage without fatalities. The most recent tornado occurred on June 4, 2025, when an EF1 traveled 6.8 miles with a maximum width of 300 yards, causing $93,500 in property damage with no fatalities.