Raised beds are one of the best upgrades you can make to a vegetable garden. They warm up faster in spring, drain better after rain, keep pathway weeds from creeping in, and let you fill them with quality soil instead of fighting whatever is already in the ground. This project builds a simple 4-by-8-foot bed, a size that lets you reach the center from either side without stepping into the soil.
What you’ll need
- Four untreated cedar or pine boards, 2 inches thick, 8 to 12 inches wide (two cut to 8 feet, two cut to 4 feet — most lumber yards will cut these for you)
- Four 4×4 wooden posts, cut into 12-inch corner stakes
- 3-inch exterior wood screws
- A drill/driver
- A level
- Landscape fabric (optional, to line the bottom if placing over grass)
- Enough garden soil and compost mix to fill the bed — roughly 20 to 24 cubic feet for a bed this size at 8 inches deep
Step 1: Choose and prep the site
Pick a spot that gets at least six hours of direct sun. Mow or clear the area, and if you’re placing the bed over grass or weeds, lay down a few sheets of cardboard or landscape fabric first — this smothers what’s underneath without you needing to dig it out.
Step 2: Assemble the frame
Lay your two long boards and two short boards on the ground in a rectangle. At each corner, stand one of your 12-inch posts on the inside corner and drive two screws through each board into the post, so the post ties both boards together. Repeat for all four corners — the posts double as both structural anchors and stakes that will sink into the ground.
Step 3: Level and position the bed
Move the assembled frame to its final spot. Use a level across the top of the frame in both directions, digging out high spots or adding soil under low corners until it sits level — this keeps water from pooling on one side once it’s planted.
Step 4: Line and fill
If you laid cardboard or fabric down first, trim any excess sticking out beyond the frame. Fill the bed with a mix of quality garden soil and compost, generally in a ratio of about 60% soil to 40% compost. Fill to about an inch below the top edge, since the soil will settle over the first few waterings.
Step 5: Water it in and plant
Give the new soil a thorough soaking before planting — this helps it settle evenly and reveals any low spots you’ll want to top off. From there, it’s ready for seeds or transplants right away.
A few upgrades worth considering
If rabbits or digging animals are a problem in your yard, staple hardware cloth to the underside of the frame before filling it. If your back or knees make ground-level beds uncomfortable, the same basic method works at a taller height — just add a center support post along each long side to keep the taller walls from bowing outward under the weight of the soil.