Officials say 187 twisters touched down in Kansas during the year.
That's far more the 116 reported in runner-up Texas and 50 more than the previous state record, set in 2007.
While the national numbers haven't been completed for November and December, Kansas' numbers have been verified.
KSN-TV, which covers the western two-thirds of Kansas with five stations, reported 412 tornado and thunderstorm warnings over a five-day period bracketing the Memorial Day holiday.
In a 24-hour period on that Friday and Saturday, KSN reported 145 warnings, smashing the record it set the year before on the weekend Greensburg was nearly destroyed.
The Memorial Day storms were responsible for two of the four deaths in Kansas tornadoes last year.
(Copyright 2009 by The Associated Press. All Rights Reserved.)