I usually wait until the last weekend in April to plant my raised beds I built a few years ago. Tomatos, okra, bush beans & cucumbers seem to do real well in them but for some reason I cannot get either yellow squash of zucchini squash to produce in them. I initially filled them with "garden mix" from a local nursery and I add a large bag or two of Miracle Grow Garden Soil each spring and mix it in. I built them using 1x8 Western Cedar, 4x4 posts for the corners secured with lag screws. I saw some raised bed kits like these online and just followed their diagrams with my own materials. The website wanted $800 plus tax for the kits to build these and I spent about $60 on materials and a weekend. Actually, the garden mix soil to fill them up cost more than the materials to build them(cost me about $120 for enough scoops to completely fill them). I'll post some pics of the boxes. I used to have a 25x50 garden area(you can see where it was in one of the pics) but weeding, etc. got to be just too much hassle. These are very "managable" and my wife and I get plenty of fresh veggies out of them each year. If anyone has any advice on being successful growing squash in a raised bed, please share!!!