Yes, the gardening book said "as soon as the soil can be worked" so I figured what the heck. Last year I put in the lettuce in mid March and it did fine. This year I'm keeping a record of what I plant and when, and I'll note down when and if it germinates, etc. I will probably buy the small tomato, squash and pepper plants and put them in around May 1st. That's what I did last year and it worked out. I don't really want to get into starting the seeds indoors and the plants aren't expensive in the nursery.