I happened upon this site and discovered Coppell has a Farmers Market, still not a short distance form home but at least 1/2 the distance of Dallas, so it wasn't such a loss if it wasn't soo great. I found it with great ease and was definitely pleased with the market. Its not the biggest farmers market, but what it lacks in quantity makes up for in quality. I will definitely be going back next weekend to pick up some pumpkin ravioli.
I only gave it 4 stars because if you're driving from a city further away it might be a slight disappointment since its small, I'm 11 miles away but definitely don't mind the drive.