My Kale and Swiss Chard (and some Spinach) survived the winter and are coming in strong already. They're cool-season crops so they can handle any frost we may get, just maybe not a hard freeze. I have been looking for some kohlrabi plants at Home Depot, but haven't found any yet. I could start some from seed, but I should have done that about 4 weeks ago if I was going to do it. It's cold-weather tolerant too. The rest will go in the ground the week of April 15th or after, depending on the 7-day forecast by then. If the forecast from the 15th out 7 days looks good, you're almost 100% in the clear from frost in Middle Tennessee.
Oh, I picked up a Garden Weasel to till up my raised beds. It works pretty well. It's a nice workout for your arms, but for busting up some small plots it's quite good. I wouldn't want to do more than about 100 sq. ft with it though, and even then I'd plan to space that out over a few days. The wetter the soil, the easier it is to till.