Good Seedbeds Lead to Good Germination
Read the back of your Carrot, Spinach, and Radish packets and you'll see it: "Plant as soon as ground can be worked." What this means is that the ground is no longer frozen, and has dried to a level that is workable.
Wilson's Home Farms garden preparation will work your soil the way you want: rototilled or broad forked, amend your soil with the nutrients you select: compost, organic fertilizers, and shape your beds how you need them to be shaped.
To add the right type and amount of fertilizer to your garden a soil sample must be taken.