I'm in Randolph Co, Missouri and I would say you'd be fine. We're still a ways off from our first frost. I'd say if you do it within the next few days, you'll have a good showing of clover before that first frost hits. Might as well through in some turnip seed with your clover... that way if the clover DOES happen not to do well then at least you got the turnip planted and deer love them come cold weather!
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!