You might get away with planting it now. I grow both green and purple. It is so hot the seeds germinate quickly. The plants are pretty tough and take less water than tomatoes.

I grew up in Texas and when I saw the okra plants on "Good Eats", I thought they had a gorgeous flower, like a hibiscus (duh). I started mine in the greenhouse and planted them out about 2 weeks ago. They are less than 6" tall, but are growing faster in the ground than in the newspaper pots!! I don't like okra but have a friend who does, so he may get the crop! It will be interesting to see how big they get. I also planted cotton for novelty. They aren't doing as well.

never grown okra, but have grown its close cousin manihot. it grew 7' in about 3 months. we have a shorter season than the south, but longer days and more intense light. i think you will do fine. if fall is mild, it think you might still have time this year if you plant now.