How to Build a Raised Garden Bed from Wood

Wood Raised Beds: The Classic Choice

Wood is the most popular material for raised garden beds — and for good reason. It's natural, beautiful, easy to work with, and biodegradable. A well-chosen wood species will last a decade or more without any treatment, and as it ages it develops a beautiful weathered character that looks right at home in any garden. This guide focuses on choosing the right wood, building a durable frame, and setting up your bed for maximum growing success.

Choosing the Right Wood Species

Wood selection is the most important decision for a raised bed that will last:

• Cedar (Western Red Cedar): The top choice for raised beds. Naturally contains oils that resist rot and insects. Untreated cedar beds last 10–20 years. Beautiful reddish color that weathers to a silver-gray.
• Redwood: Similar rot resistance to cedar. More expensive but excellent longevity. Beautiful grain.
• Black locust: Extremely rot-resistant — can last 25+ years. Harder to find but worth it if available locally.
• Douglas fir: Affordable and strong. Less rot-resistant than cedar — expect 5–10 years. A good budget option.
• Untreated pine: Cheapest option. Will rot in 3–5 years. Fine for a temporary or experimental bed.

What to avoid: Pressure-treated lumber (especially older CCA-treated wood), railroad ties, and any wood treated with unknown chemicals. These can leach harmful substances into your soil and food.

Tools & Materials You'll Need

Tools

• Drill/Driver: DEWALT 20V MAX Cordless Drill/Driver Kit
• Circular Saw: DEWALT ATOMIC 20V MAX Circular Saw
• Tape measure, speed square, level, pencil

Materials

• 2x6, 2x8, or 2x10 cedar boards — for the sides (width determines bed height per course)
• 4x4 cedar posts — for corner reinforcement
• Wood Screws Assortment Kit — use 3" exterior-rated galvanized or stainless steel screws
• LAVEVE Weed Barrier Landscape Fabric
• Hardware Cloth / Wire Mesh — for gopher protection
• High-quality raised bed soil mix

Wood Sizing Guide

• 2x6 boards: 5.5" actual height per course. Two courses = 11" bed. Great for most vegetables.
• 2x8 boards: 7.25" actual height per course. Single course = 7" bed. Two courses = 14.5" bed.
• 2x10 boards: 9.25" actual height per course. Single course = 9" bed. Two courses = 18.5" bed.
• 2x12 boards: 11.25" actual height per course. Single course = 11" bed. Great for deep-rooted crops.

Step-by-Step Instructions

Step 1: Choose Location and Mark the Footprint

Select a spot with 6–8 hours of direct sun. Mark the bed footprint with stakes and string. Standard dimensions: 4 feet wide x 8 feet long. Confirm the ground is reasonably level — use a long level to check.

Step 2: Cut Boards and Corner Posts

Cut side boards to length. For a 4x8 bed with 4x4 corner posts: long sides = 8 feet, short sides = 4 feet minus 3" (to account for the 4x4 post width on each end). Cut corner posts to bed height.

Step 3: Assemble the Frame

Stand corner posts upright and attach side boards to the inside faces using 3" exterior screws. Pre-drill all holes near board ends to prevent splitting. Drive 2–3 screws per board end. Build up multiple courses for taller beds, staggering joints between courses.

Step 4: Check for Square and Level

Measure diagonally from corner to corner — both measurements must be equal for a square frame. Use a level to check that the top of the frame is level. Adjust by digging out high spots or adding soil under low spots.

Step 5: Prepare the Ground Inside the Bed

Kill existing grass and weeds by laying cardboard directly on the ground inside the bed. Wet thoroughly. This sheet mulching method smothers vegetation without chemicals and the cardboard breaks down into organic matter over the season.

Step 6: Install Hardware Cloth (Optional)

If gophers or moles are a problem in your area, line the bottom of the bed with 1/2" hardware cloth before filling. Cut to size and staple to the inside of the frame. This prevents burrowing pests from entering the bed from below.

Step 7: Fill with Soil

Fill with a high-quality raised bed soil mix:

• 60% quality topsoil
• 30% compost (homemade or bagged)
• 10% perlite or coarse sand for drainage

Fill to 1–2" below the top of the frame. The soil will settle — top up as needed.

Step 8: Add a Cap Board (Optional)

For a finished look and a comfortable sitting edge, add a 2x6 cap board laid flat on top of the frame sides. Attach with exterior screws. The cap board also protects the end grain of the side boards from moisture, extending the life of the bed.

Extending the Life of Your Wood Bed

• Use cedar or redwood for maximum natural longevity
• Add a cap board to protect end grain from moisture
• Apply linseed oil to the exterior of the boards annually to slow weathering
• Avoid letting soil pile against the outside of the boards — this accelerates rot
• Line the interior with landscape fabric to prevent soil contact with the wood

Pro Tips

• Use stainless steel or hot-dipped galvanized screws — regular screws rust and stain the wood.
• Build beds no wider than 4 feet so you can reach the center from either side.
• Orient beds north-south for even sun exposure.
• Add drip irrigation inside the bed for effortless, consistent watering.
• Top up with compost each spring to replenish nutrients lost over the growing season.

Estimated Cost & Time

Materials: $50–$130 for a 4x8 cedar bed. Time: 2–3 hours. One of the best outdoor DIY investments you can make.

Final Thoughts

A wood raised garden bed is a gift that keeps giving. Every season it produces food, beauty, and the deep satisfaction of growing something yourself. Choose cedar, build it right, and it will be a productive part of your garden for a decade or more.