A cedar raised planter box can be built in an afternoon using cedar fence pickets or boards, basic tools, and under $30 in materials for the budget-friendly version.
You don’t need a workshop full of gear or a fat lumber bill. Whether you want a ground-level bed for vegetables or an elevated box easier on your back, the material choice and cut list are straightforward. The trick is using cedar for its natural rot resistance and a build method that accounts for wet soil weight without bowing or splitting.
Which Cedar Build Is Right For You?
Two approaches cover most yards: the fence-picket budget box and the thicker board method. The picket version uses 6-foot cedar fence pickets and 2×4 lumber, costing around $30. The board version uses 8-foot cedar deck boards and 2×2 balusters for braces, offering a sturdier, taller wall. Your choice depends on whether saving money or long-term durability matters more.
| Build Method | Final Size | Material Cost (2025) | Best For |
|---|---|---|---|
| Fence Picket | 6 ft x 3 ft x ~11 in | Under $30 | Budget builds, temporary beds, quick projects |
| 8-ft Cedar Boards | 8 ft x 4 ft x 1 ft | $50–$80 | Permanent beds, heavy soil, vegetable gardens |
| Elevated Planter | 6 ft x 2 ft x 3 ft | $100+ | Patios, accessible gardening, no-bend harvesting |
Still deciding? See our roundup of best cedar raised planter boxes to compare pre-built options.
Tools and Materials You’ll Need
- Lumber: Cedar fence pickets (6 ft, at least 6 boards) or cedar deck boards (8 ft, 2×6 or similar), plus 2x4s or 2×2 balusters for braces.
- Fasteners: 2-inch exterior wood screws or GRK construction screws. Interior screws will rust in damp soil.
- Tools: Circular saw or miter saw, drill with bits for pilot holes, clamps, tape measure, speed square.
- Extras: Hardware cloth for bottom, landscape fabric, plastic liner for moisture retention.
Step-by-Step: Build a Fence-Picket Planter (Under $30)
This is the fastest method, most forgiving for a first-timer. The finished box is about 11 inches tall, enough for shallow-root crops like lettuce, herbs, and peppers.
- Pre-drill every screw hole—cedar splits easily.
- Cut the short sides: Cut 2 of the 6-ft pickets in half to make 4 boards at 3 ft each.
- Cut the support braces: Cut 6 pieces of 2×4 lumber into 11-inch sections.
- Build the long panels: Lay two 6-ft pickets side by side. Attach 3 support braces—one centered, one at each end—using 2-inch screws. Repeat for the second panel.
- Assemble the rectangle: Stand both long panels upright. Attach the 3-ft pickets at each end, screwing into the support braces. Clamp each corner flush before driving screws.
All screws should be on the outside. Place the bed on bricks or pavers to keep wood off direct soil—that adds years of life.
Elevated Planter With Hidden Drainage
An elevated box lets you garden without bending and dries out faster, benefiting plants that hate wet feet. The key addition is a hidden drainage system that keeps water from pooling against the cedar.
Frame and Leg Assembly
Build 4×4 legs by joining two 1×4 boards at a right angle for each corner. Attach leg assemblies to a 2×4 frame, then build box walls like the ground-level method: side panels with support braces, connected at corners. Use side panels as spacers during assembly to keep everything square.
Drainage Layer
Cover the bottom with landscape fabric, then unroll a plastic liner inside.
Common Mistakes That Ruin a Cedar Planter
- Skipping pilot holes. Cedar splits easily; pre-drill every screw hole.
- Placing wood directly on soil. This accelerates rot. Sit the bed on bricks or pavers with landscape fabric underneath.
- Using 2x4s without internal braces. A 2×4 frame needs 2×2 internal supports or 4×4 posts to prevent bowing.
- Leaving dog ears on. Uneven tops look sloppy and create gaps between boards.
FAQs
What kind of wood lasts longest for a raised planter?
Cedar resists rot and insects naturally without chemical treatments. Redwood is another good option, though it costs more. Pine is cheaper but will rot in 2–3 years unless you line the inside.
Do I need to treat or seal cedar before using it?
No. Cedar’s natural oils protect it. To darken the color, use a plant-safe exterior oil; avoid pressure-treated chemicals near edible soil. An unsealed cedar planter will weather to silver-gray over time.
How deep should a raised planter be for vegetables?
Tomatoes, peppers, and root vegetables need at least 12 inches of soil depth. Shallow crops like lettuce and herbs grow fine in 6 to 8 inches. The fence-picket method gives 11 inches, which works for most vegetables except deep-rooted carrots or potatoes.
References & Sources
- Fix This Build That. “DIY Raised Planter Box Plans.” Source for fence-picket cut list and assembly method used in this guide.
- Deliacreates. “How to Make Cedar Raised Garden Beds.” Confirms board method and mid-support placement details.
- Cedar Planters (Manufacturer Resources). “Assembly Instructions.” Verified elevated planter drainage system and leg assembly approach.