Proper timing is possibly the most important factor to successful spring gardening.
Regardless of variety selected or cultural practices used, if a gardener does not do the right thing at the right time, chances of success are diminished. To estimate when planting should begin, the average first frost-free date must be established. March 15 is the average frost-free date for the area south of a line from Del Rio to Uvalde, San Antonio, Austin and Beaumont. North of this is Region I with a first frost-free date of April 10. Gardeners south of a line from Eagle Pass to Pearsall, Pleasanton and Refugio in Region III should enjoy frostless days as early as February 15.