I live up in Plano and have had the best results and yield with the early maturing types like Stupice and the cherry varieties. Your frost date comes a little later than ours so you may be able to get some of the mid-season types to ripen also.

To get a wider selection to choose from, call some local independent garden centers and ask what they have. From what I recall, there are a couple local centers that sell Fall plants. Put in transplants from now up until August. It's too late to start from seed.

The first blooms probably won't set fruit because of the heat, but you should see baby fruit by late September and early October. Finally, it's crucial to put them in a spot that will recieve full sun in October and November, not just during the summer.

Good Luck