Haggerman deadline is in May. But good suggestion!! if you are going to hunt public then start scouting now and find some unique ways to get into the land. this will put you farther back and more importantly into location other hunters are not going to get into.
Public land hunting in Texas in some of the most challenging hunting you can find. Also the most rewarding!! Be creative and challenge yourself!!
Check out the Chasing Carnivore Podcast-http://chasingcarnivore.libsyn.com