“If March 1st is your “last” frost date...”
I’m figuring sometime in Feb. is the last frost date. We usually get our worst cold early in February and that’s when everyone wants March to get here. I will start the March seeds the first of March, so they won’t go outside for a few weeks after that. I do have a few to put under grow lamp in February but they won’t go outside until March.
Here is a link for guidance on planting dates in Texas. Which large city is the closest to you?
http://www.victoryseeds.com/frost/tx.html