The schedule of the tournament had been widely criticised the previous season and the ECB had decided to reduce the minimum number of days in which a county would play from 92 to 86 for 2012.
Hampshire Royals and Yorkshire Carnegie, as the winners and runners-up of the tournament respectively, qualified for the 2012 Champions League Twenty20.
[2] In the quarter-final match between Sussex and Gloucestershire, Scott Styris scored the equal third-fastest century in T20 history, after making 100 not out from 37 balls.
A free draw determines the placement of the remaining four teams and the semi-final and final match-ups.
[11] This table contains the top five highest scores of the season made by a batsman in a single innings.