Cedar vs pine for raised beds

Cedar and pine are the two most common choices for a raised bed frame in most of the United States, and the choice mostly comes down to how long you want the frame to last against how much you want to spend building it. Redwood, covered briefly at the end of this guide, behaves similarly to cedar where it is available.

Cedar: pay more, replace less often

Cedar heartwood contains natural oils that resist rot and insects without any chemical treatment. An untreated cedar frame in direct soil contact commonly lasts eight to fifteen years depending on climate and how consistently wet the site stays; a bed that drains well and dries out between rains will generally outlast one sitting in a low, damp spot. Cedar costs more per board foot than pine, often noticeably more, but it needs no additional treatment and nothing extra to buy at the point of building.

Untreated pine: cheap now, replaced sooner

Pine is usually the least expensive option at the lumber yard, and for many builders that price difference is the whole reason to consider it. The tradeoff is durability: untreated pine in direct contact with damp soil typically breaks down within three to six years, closer to three in consistently wet climates and closer to six in drier ones. For a bed you expect to rebuild or replace within a few years anyway, or for a low cost first bed to try raised bed gardening before investing more, untreated pine is a reasonable choice.

Pressure treated pine: the middle ground

Ground contact rated pressure treated pine closes much of the durability gap with cedar, often reaching fifteen years or more, while staying closer to pine's price than cedar's. Modern residential pressure treatments use copper based formulas rather than the older chromated copper arsenate treatment that was phased out of residential lumber years ago; check the tag at the yard for the specific treatment used and confirm it is rated for ground contact rather than only above ground use, since the two ratings use different chemical concentrations.

Is treated wood safe for a food garden

Current guidance generally treats modern copper based pressure treated lumber as acceptable for garden use, unlike the older arsenic based treatment. If you would rather the treated wood not touch the soil directly as an extra precaution, a landscape fabric liner along the interior walls, covered in the build variants of each plan in the Raised Bed Build Pack, adds a barrier without blocking drainage.

What to avoid regardless of species

Reused railroad ties, utility poles, or other salvaged treated timber are a different category of product from residential pressure treated lumber, often treated with creosote or older formulations not rated for garden contact, and should not be used for a bed growing food.

Making the call for your build

If budget is the main constraint and you are comfortable replacing boards in a few years, untreated pine keeps the upfront cost lowest. If you would rather build once and not think about it again for a decade or more, cedar or ground contact rated pressure treated pine are the two realistic options, with cedar costing more but needing no chemical treatment. The free configurator lets you compare the cut list and board count for the same bed size across cedar, pine, and redwood so you can price out the actual lumber cost difference for your specific dimensions before deciding.

Build procedure and working dimensions

Use the same layout method for cedar, untreated pine, and ground contact rated treated pine. Cut all boards square, keep the best face outward, and predrill near every board end. A practical bed size is 4 ft wide by 8 ft long, because the center can be reached from both sides and standard 8 ft boards need fewer cuts. For most vegetables, use a finished soil depth of 10 to 12 in. For carrots, parsnips, and potatoes, plan for 14 to 18 in if the native soil below is compacted.

Set the bed on level ground, or cut the high side down rather than raising the low side with loose soil.
Use 2 by lumber for the frame if the bed is longer than 6 ft. A 1 by board can bow outward when wet soil pushes against it.
Place corner posts inside the frame if you want a clean outside face. Use 4 by 4 posts or doubled 2 by material cut to the exact bed height.
Fasten each board end with two exterior rated screws. Keep screws about 1 1/2 in from the end and about 3/4 in from the board edge to reduce splitting.
Check both diagonals before final tightening. A 4 ft by 8 ft rectangle is square when both diagonals match, about 8 ft 11 5/16 in.
Add a middle stake or inside cleat on each long side for any bed over 6 ft long. This limits outward bowing after the first full watering.

For a two course frame made from 2 by 6 boards, stagger the corner screw locations between the lower and upper boards. If the boards are damp from the yard, leave a small 1/16 in gap between board ends rather than forcing them tight. The gap will usually close or open seasonally without damaging the corner.

Tools, fasteners, and quantities to plan before cutting

For a basic 4 ft by 8 ft bed built from two stacked courses of 2 by 6 lumber, plan the cut list before buying. This avoids mixing board lengths and making one side from short offcuts. Use exterior rated structural or deck screws, not drywall screws. If the wood is treated, use fasteners labeled for treated lumber.

Item	Practical figure	Use on the bed
Side boards	Four pieces at 8 ft	Two long sides, two courses high
End boards	Four pieces at 4 ft, adjusted for your corner layout	Two short sides, two courses high
Corner posts	Four posts at 11 to 12 in for a 2 by 6 double course	Inside fastening points
Mid side braces	Two stakes or cleats at 11 to 12 in	One centered on each long side
Screws	About 48 to 64 screws	Corners, stacked boards, and braces
Soil volume	About 32 cubic ft for 4 ft by 8 ft by 12 in	Fill volume before settling
Assembly time	2 to 4 hours for one person after materials are on site	Cutting, drilling, fastening, leveling

Useful tools are a tape measure, pencil, speed square, circular saw or handsaw, drill, countersink bit or pilot bit, driver bit, level, mallet, and work gloves. A clamp helps hold corners flush while fastening. If the bed will sit on turf, remove the sod under the frame line so the boards sit on mineral soil rather than grass that later decomposes unevenly.

Frequent mistakes and how to recover

A common mistake is building the frame first and then discovering that the site drops several inches from one end to the other. If the difference is under 1 in across 8 ft, loosen the frame, tamp the high spots, and refill under low corners with compacted gravel or firm soil. If the difference is 2 in or more, step the bed into the slope or choose another location. Do not rely on loose potting mix to support a corner.

Another mistake is using short screws that only bite into the post by a small amount. If a corner opens after filling, remove soil from that corner to reduce pressure, clamp the joint closed, and replace the fasteners with longer exterior rated screws. Add a second inside block if the end grain has already split.

If long sides bow after watering, do not empty the whole bed unless the frame is failing. Pull back 12 to 18 in of soil along the bowed side, straighten the board with a clamp or temporary prop, and add an inside brace at the midpoint. For beds taller than 12 in, add a cross tie between opposite long sides if access allows.

If untreated pine begins softening at the soil line, you can often gain a season by adding an exterior scab board over the weak section. Use a board at least 24 in longer than the damaged area, screw it into sound wood on both sides, and plan a full rebuild after harvest. More general troubleshooting questions can be checked in the raised bed FAQ.

Special cases that change the wood choice

In very dry climates, board checking and end splitting may be a bigger issue than decay. Predrill every screw, avoid placing screws too close to the end, and expect visible cracks that do not always mean structural failure. In wet coastal or shaded sites, raise the frame on a thin bed of compacted gravel and keep mulch pulled 1 to 2 in away from the outside face so the board can dry.

For beds against a fence or wall, leave at least 18 in of walking or tool space if possible. A bed that can only be reached from one side should be no wider than 30 in. For wheelchair access, keep the working width near 24 to 30 in per reachable side and make paths firm, flat, and at least 36 in wide.

For renters or temporary gardens, build in 3 ft by 6 ft or 4 ft by 4 ft modules. Smaller frames are easier to move, and a single damaged side can be replaced without dismantling a long bed. For children, a 3 ft width is often easier to reach than 4 ft, and an 8 to 10 in soil depth is enough for lettuce, herbs, bush beans, and many flowers.