In 2014, all states will have their congressional primaries in May, June, July, August or September, except that Texas will hold its congressional primary on March 6, and Illinois on March 18. It is possible that during 2013, legislatures in those two states will modify their 2014 primary dates. Also Louisiana doesn’t hold congressional primaries. It just holds a congressional election on November 4, 2012, and then if no one gets 50%, holds a runoff in December.
The Texas 2014 primary date means that candidates for Congress in 2014 must file a declaration of candidacy in little more than a year from now.