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 strong to 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. April through June account for 63 of the 124 tornadoes on record near O'Fallon.
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Preliminary reports are revised, merged, and sometimes withdrawn — historically about 23% are consolidated downward once surveys complete.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.
Damage photos provided by broadcast media revealed EF-0 tree damage along Warson Woods drive. This aligns well with radar indicated rotation and a video of a very low.. (LSX)
Corrects previous tornado report from 4 SW Troy. NWS survey team found an EF-1 tornado southwest of Troy... MO. The tornado produced mostly tree damage along its 3.72 m (LSX)
Corrects previous tstm wnd dmg report from 1 W Grafton. Significant roof damage to a local restaurant. Time estimated from radar. (LSX)
Within 25 miles of O'Fallon. Quoted text is the report narrative exactly as filed. Source: NOAA Storm Prediction Center preliminary storm reports, updated daily.
What storm spotters reported near O'Fallon
2 local storm reports have been filed within 25 miles of O'Fallon and since confirmed into the NOAA archive, the earliest on May 16, 2025 and the most recent on June 4, 2025. They are already counted in the O'Fallon totals above; quoted below is the narrative each reporting office filed at the time.
NWS Storm Survey found that an EF-1 tornado formed just east of Hwy 109 in Wildwood at 2:50pm and tracked northeastward. It dissipated in the Chesterfield Valley just s (LSX)
*** 5 FATAL... 38 INJ *** Storm survey determined an EF3 tornado began near Clayton and tracked northeast through the city of St Louis and continued into Illinois. It d (LSX)
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
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 near O'Fallon.
The deadliest single event was an F4 on February 10, 1959, which caused 21 fatalities along a 23.9-mile track.
Notable Tornadoes Near O'Fallon
What the record shows near O'Fallon
The 2010s were the busiest decade near O'Fallon, with 33 of the 124 confirmed tornadoes within 25 miles; the 2020s have produced 17 so far. The O'Fallon record runs from the 1950s to today.
Of the tornadoes rated near O'Fallon, 93 reached EF0 or EF1 and 31 reached EF2 or stronger. The most intense on record near O'Fallon is rated EF4, of which 4 are logged.
Across the last 20 years O'Fallon has averaged 2.7 confirmed tornadoes a year within 25 miles, 54 in total. 2011 was the busiest of them with 8, and 2 of those years passed with none at all.