Old-school raised beds built from pressure-treated 2x6s last 3-5 years before the dirt-side boards rot through and the bugs find them. This corrugated-metal-plus-2x4 design lasts much longer because the metal does the soil-contact work and the wood only frames it.
This walkthrough from SimonSaysDIY breaks the build into seven steps. The trickiest part is keeping the panels square and the long sides supported - a 10-foot bed has enormous outward pressure from a yard of soil pushing against it. The cross-supports in step 6 stop that pressure from blowing out the long walls over time.
Build in a Weekend: The Fastest Method
If you want a raised bed up and planted by Sunday night, skip the saw work. A pre-cut cedar kit (Vego Garden, Greenes Fence, or the Costco cedar kit when it comes back in stock) lands in 4-6 boxes and slots together with the included corner brackets in about 90 minutes. Budget around $80-150 for a 4-by-8 bed, plus soil.
The other shortcut is buying stackable corner brackets (search for "raised bed corner brackets" or "Eden Made bed brackets") and pairing them with off-the-shelf cedar fence boards from the big-box store. No miter saw needed - the brackets accept boards up to 2 inches thick and stack to whatever height you want. You can have a 4-by-8 bed framed and standing in under an hour.
The 2x4-and-corrugated-metal build below outlasts both kit options by years, so it is still the right pick if you want one bed that lasts a decade. The kit and bracket routes are the right pick if you want three beds in by Memorial Day.
Saturday-to-Sunday Timeline
Here is the realistic weekend schedule for the 2x4 + metal build below, assuming you already have the tools on hand and the lumber pre-cut by the yard (most yards will do this free with a list).
Saturday morning (3 hours): Lay out the footprint, level the ground, and frame panels one and two. This is the slowest part because the first panel teaches you the toenailing rhythm.
Saturday afternoon (2-3 hours): Frame the remaining panels, cut the corrugated metal to size, and screw it into the panel backs. Stop here for the day - the metal edges are sharp and you are tired.
Sunday morning (2 hours): Stand the panels, connect the corners, add the top rail and cross supports. The bed is now structurally complete.
Sunday afternoon (2-4 hours): Layer in the wood and yard waste, top with soil and compost, water it down to settle, and plant. Done. Plant tomatoes if it is past your last frost date - late spring through early summer is the sweet spot for getting transplants established before the heat.
