Cynthia- I think most people wait to start shipping in April (or more northern in May and June ) but most deep south hybridizers will start in Feb and anyone that has warmer climates, greenhouses, and such can start shipping earlier as well. I got mine from Larry Grace last month. He has an unheated greenhouse, but it still protects the daylilies from the cold and the sun heats it so the DL will continue to grow. Any other ones I'm getting I've asked to get end of February or early March where possible since I can pretty much plant anytime here, so the earlier the better for me.
Most of the ones I'm shipping in March, the people say their area heats up pretty quickly so they want to get them planted before it gets hot.