If you don't want to move it in spring, then wait until mid/late September.

I believe it has a deep tap root, making it more difficult to move successfully. I think you may risk killing the plant if you move it before spring. I gow hardy hibiscus, but have not moved it. This thought is just my intuition. Before you move it in fall, I would wait to hear from someone who says they have done this.

Thanks laceyvail, and julie. I was afraid there was some reason not to move it in the fall. I think you are right, if someone has already moved one successfully in the fall, that would give me the confidence to do it, otherwise, I guess I just have to put up with it where it is and work around it until spring.

I am thinking maybe I should try rooting some cuttings to try to propagate it just for insurance. Has anyone done that?

I've moved them before, have done it in both early spring and fall. No problem doing at either time, be sure to mulch well.

I have moved mine twice: once in spring, once in fall. It was a smaller plant the first time (fall). I don't remember noticing a taproot... I did take care to keep it well watered. Since hibiscus are tropicals, I cannot imagine that it would suffer badly from your heat. Definitely mulch, as mxk said, and move it into good soil. Personally, if you are a conscientious one about aftercare, I'd move it now to give those roots maximum time to re-establish.

I'd like to know how to propagate them too. Mine is Krown Jewels and I love it.