When to start lettuce in TX

I know it is probably okay to start Spinach and other cool weather greens, but we just had an out of the ordinary downpour of snow in and around Dallas today. I want to start some greens for the farm stand...Mesclun and leaf lettuces etc. Will these start in the cold? If lettuce is frozen in the supermarket it's ruined. I can do hoop covers with rebar and plastic, or even build a more sturdy cover. I don't really want to do cold frames, I think they are too small/ too much trouble for the South, does that make sense? P.S. I was thinking of just getting a couple of small kiddie pools and filling with all the finished compost I have plus some bagged product to fill it up. My area set aside for this project is not ready yet (tons of Bermuda has to be killed out before I will even think of putting in permanent raised beds) so this would be temporary.
Thanks in advance.
Rita Foust
Garland, TX
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