Q.How late can I plant tomatoes in N. Texas
How late can I plant tomatoes in North Texas (north of DFW) and still harvest fruit? Heavy rains here have flooded our raised bed garden this May several times, rotting our tomato plants. Everything else seems to be coming around. Is it too late to set more starter plants and harvest tomatoes this summer, considering we have a summer weight crop cover in place? If so, which variety do you suggest?

You should have plenty of time to plant and still have a tomato crop.
Look for varieties that have a 50 to 60 day's to maturity.
The tags provided by the growers should have that information.
Best of luck.
Here are some links with more information including a list of warm weather varieties.
https://www.gardeningknowhow.com/edible/vegetables/tomato/planting-time-for-tomatoes.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-temp-for-tomatoes.htm