The manual says lettuce can go into the garden as early as the soil can be worked. That's now!!
Got off work early on a beautiful day. So I planted some lettuce. White seeds on the left. Black seeds on the right. Just the one long row on the near side. The back side is still in the shadow of those boards in Bill & Ada's back yard.
And as long as the rain held off, I figured some radishes would nicely fill in some of the space next to the peas. Just the one row.