Growing
How to Build a Raised Garden Bed
Growing · 4 min read · Updated November 14, 2026
You build a raised garden bed by framing a box of lumber or blocks, setting it on level ground in a sunny spot, and filling it with good soil. A basic 4 by 8 foot bed takes an afternoon, simple tools, and no digging at all.
Raised beds warm up earlier in spring, drain well, and let you garden without bending all the way to the ground. They are the backbone of most small food gardens, including the ones in our guides.
Pick the spot and size
Pick the sunniest spot you have. Most vegetables want at least 6 to 8 hours of direct sun. Keep the bed where a hose can reach it, and near the kitchen door if you can, since beds you walk past get picked and weeded more.
Make the bed no wider than 4 feet so you can reach the middle from either side without stepping in and packing the soil down. Length is up to you and your space. A single 4 by 8 foot bed is a great first build. About 10 to 12 inches deep suits most crops.
Choose safe materials
Cedar and other rot resistant woods last longest without treatment. Plain pine is cheaper and fine for a first bed, it just will not last as many years. Modern pressure treated lumber sold for home gardens is rated for ground contact, but many gardeners still line it or pick untreated wood for food beds to keep it simple.
Skip old railroad ties and mystery reclaimed wood. They can be soaked in creosote or old chemicals you do not want near food. If you are unsure what wood was treated with, do not grow food in it. Stone, concrete blocks, and metal kits are also solid, long lasting choices.
Build and level the frame
Cut the boards to length, screw the corners together with deck screws, and use a square to keep the frame true. Corner posts of short 4 by 4 pieces inside the corners add strength and give the screws more to bite into.
Set the frame in place and level it. On a slope, dig the high side in a little rather than propping the low side up. Use eye protection when cutting, and take care with power saws, since most bed builds involve a few long cuts. Lay cardboard over any grass inside the frame to smother it, overlapping the sheets so no gaps show.
Fill it and plant
Fill the bed with a loose, rich mix rather than plain garden soil, which packs down and drains poorly in a box. Our guide to raised bed garden soil mix gives the simple recipe and what to avoid.
Water the filled bed well and let it settle a day before planting, then top it up. Good first crops are the fast, forgiving ones, like lettuce and potatoes from our guide on how to grow potatoes. A trellis on the north edge later adds climbing space, as in our vertical gardening guide.
Frequently asked questions
Do I need to dig up the ground under the bed?
No. A frame of stacked boards on level ground works fine and the soil stays put. Digging is only needed to level a sloped spot or remove thick turf under the bed.
Should I line the bottom of the bed?
A bottom is not needed. Cardboard laid over grass inside the frame smothers weeds and rots away. Skip landscape fabric at the bottom, since it can block drainage and roots over time.
Can a raised bed go on top of clay soil?
Yes, that is one of its best uses. The bed soil sits above the bad soil, and roots get a clean start. Extend the idea by filling with fresh mix rather than digging the clay in.
How much soil does a raised bed take?
A 4 by 8 foot bed is about 10 to 11 cubic feet per foot of depth, so a 10 inch deep bed takes roughly 9 to 10 cubic feet. Buying bagged soil for one bed is easy. For many beds, a bulk delivery is far cheaper.
Will raised beds keep rabbits and deer out?
They can, depending on your yard. A simple hoop cover of netting or mesh over the bed keeps most critters off crops while letting rain and sun through.