Buying guide
Raised Garden Bed Dimensions: Width, Length and Height
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The standard raised garden bed dimensions are 4 ft wide, 8 ft long and 11 in tall. Four feet is the widest you can reach across from both sides, 8 ft is one full board length so nothing is wasted, and 11 in (two 2x6 boards) is deep enough for most vegetables. If the bed sits against a fence or wall, drop the width to 2 or 3 ft, because you can only reach it from one side.
How Wide Should a Raised Garden Bed Be?
Width is the one dimension with a real limit: you have to reach the middle without stepping into the soil. Stepping in compacts it, and compacted soil is the thing a raised bed is built to avoid.
| Width | Reach from | Best for |
|---|---|---|
| 2 ft | One side | Beds along a fence, wall or house |
| 3 ft | One side, or both | Fence beds, kids and shorter gardeners |
| 4 ft | Both sides | Free standing beds, the standard width |
Past 4 ft, most people cannot comfortably reach the center, so a wider bed means stepping in or leaving the middle for crops you rarely touch. Use real lumber sizes when you plan: a 2x6 measures 1 1/2 x 5 1/2 in, so a bed made from 2x6 boards has about 3 in less planting space than its outside size.
How Long Should a Raised Garden Bed Be?
Length has no growing limit, so let the lumber decide. An 8 ft board makes a full 8 ft side with no cutting, and the short sides come out of the leftover boards. Beds longer than 6 ft need a middle post on each long side, or the boards bow outward under wet soil. Past 8 ft you buy longer boards for the sides, so the shopping list changes. This table is for a bed 4 ft wide and two 2x6 boards (11 in) tall.
| Length | 2x6 boards | 4x4 posts | Soil |
|---|---|---|---|
| 4 ft | 4 x 8 ft | One 4 ft | 12.6 cu ft |
| 6 ft | 6 x 8 ft | One 4 ft | 19.5 cu ft |
| 8 ft | 6 x 8 ft | One 6 ft | 26.2 cu ft |
| 10 ft | 4 x 10 ft, 2 x 8 ft | One 6 ft | 33.0 cu ft |
| 12 ft | 4 x 12 ft, 2 x 8 ft | One 6 ft | 39.9 cu ft |
The 8 ft bed is the sweet spot: it takes the same six boards as a 6 ft bed and gives a third more planting space. Soil is the space inside the walls, less the posts. Every cut list is on the raised garden bed plans.
How Deep and How Tall Should a Raised Garden Bed Be?
Height is how tall the walls are, and depth is how much soil the roots get. For a bed on open ground, roots can grow below the bottom board into the soil under it, so even a low bed works. On concrete, a patio or hard clay, the walls are all the root room you have. Here is what each stack of 2x6 boards gives you, with the soil it takes for a 4 x 8 ft bed.
| 2x6 courses | Height | Soil, 4 x 8 ft | In cubic yards |
|---|---|---|---|
| 1 | 5 1/2 in | 13.1 cu ft | 0.5 |
| 2 | 11 in | 26.2 cu ft | 1.0 |
| 3 | 16 1/2 in | 39.3 cu ft | 1.5 |
| 4 | 22 in | 52.3 cu ft | 1.9 |
How much soil depth each crop wants varies by variety, so treat these as usual ranges:
| What you grow | Soil depth | Courses |
|---|---|---|
| Lettuce, salad greens, herbs, radishes | 6 to 8 in | 1 to 2 |
| Most vegetables: peppers, beans, squash, cucumbers | 10 to 12 in | 2 |
| Tomatoes, carrots, potatoes, parsnips | 12 to 18 in | 3 |
If you only have one bed and want it to grow everything, make it three courses (16 1/2 in). It costs half again as much soil, but it never limits a crop. Want to garden standing up? A bed 30 in tall is a different build, because it needs legs or a frame. See the elevated raised garden bed plans.
Standard Raised Garden Bed Sizes
Most beds are built or bought in one of these sizes. Soil is for a bed made of two 2x6 boards (11 in tall).
| Size | Planting area | Soil at 11 in | Best for |
|---|---|---|---|
| 4 x 8 ft | 32 sq ft | 26.2 cu ft | The all round vegetable bed |
| 4 x 4 ft | 16 sq ft | 12.6 cu ft | First beds, herbs, small yards |
| 3 x 6 ft | 18 sq ft | 14.2 cu ft | Narrow yards, reach from both sides with ease |
| 2 x 8 ft | 16 sq ft | 12.0 cu ft | Fences, walls and patio edges |
| 4 x 12 ft | 48 sq ft | 39.9 cu ft | Big gardens, one long row of crops |
The planting area is the nominal size, before the thickness of the boards. Below, the 3 x 6 ft size is drawn out with its cut list, plus a 4 x 6 ft bed (19.5 cu ft at 11 in) for a space that is short on length. The 4 x 8 ft and 4 x 4 ft versions are on the raised garden bed plans, and the wood choice is covered in the cedar raised garden bed plans.
The 3 x 6 ft Raised Bed
Narrow enough to reach across from either side, and the right size for a small yard. Six boards and one short post.
- Outside size6 ft x 3 ft
- Height11 in
- Soil to fill14.2 cu ft
- Lumber7 boards
| Part | Lumber | Cut to | Qty |
|---|---|---|---|
| Long side boards | 2x6 | 72 in | 4 |
| Short side boards | 2x6 | 33 in | 4 |
| Corner posts | 4x4 | 11 in | 4 |
Shopping list
- 6 x 2x6 boards, 8 ft (cedar, or pressure treated rated for ground contact)
- 1 x 4x4, 4 ft long, for the posts
- 32 x #9 x 3 in exterior wood screws (coated or stainless), 2 per board end
- Optional: 1/2 in hardware cloth, 6 ft x 3 ft, for the bottom if gophers or voles are a problem
- Soil: 14.2 cu ft (0.53 cu yd), or about 11 bags of 1.5 cu ft with 10% extra for settling
The 4 x 6 ft Raised Bed
A step down from the standard 4 x 8 ft bed when the space is short on length. Same boards, same cuts.
- Outside size6 ft x 4 ft
- Height11 in
- Soil to fill19.5 cu ft
- Lumber7 boards
| Part | Lumber | Cut to | Qty |
|---|---|---|---|
| Long side boards | 2x6 | 72 in | 4 |
| Short side boards | 2x6 | 45 in | 4 |
| Corner posts | 4x4 | 11 in | 4 |
Shopping list
- 6 x 2x6 boards, 8 ft (cedar, or pressure treated rated for ground contact)
- 1 x 4x4, 4 ft long, for the posts
- 32 x #9 x 3 in exterior wood screws (coated or stainless), 2 per board end
- Optional: 1/2 in hardware cloth, 6 ft x 4 ft, for the bottom if gophers or voles are a problem
- Soil: 19.5 cu ft (0.72 cu yd), or about 15 bags of 1.5 cu ft with 10% extra for settling
Beds and Paths: Fitting Them in the Yard
Leave at least 2 ft between beds, and 3 ft where a wheelbarrow or a mower has to pass. Allow room for the bed walls too, since the outside size of a bed made from 2x6 boards is 3 in larger than the soil inside. Path widths for every use, and five ways to arrange several beds, are in the raised garden bed layout guide.
Raised Bed Soil Calculator
Pick a standard size below, or type your own length, width and soil depth. The calculator gives cubic feet, cubic yards for a bulk delivery, and bags.
Raised bed soil calculator
The calculator measures the bed itself, so it does not subtract the posts: round up and add 10% for settling. What to fill the bed with is covered in how to fill a raised garden bed.
Ready Made Beds in Common Sizes
If you would rather not cut wood, these two kits cover both ends of the range: a small cedar bed and a full 8 x 4 ft metal bed. Check the listed height before you buy, because it sets how much soil you need.
Greenes Fence Premium Cedar Raised Garden Bed, 2 x 4 ft x 14 in
A small cedar bed, 2 x 4 ft and 14 in tall, for a patio, a balcony corner or a first try at growing herbs and salad. Greenes Fence makes it from untreated North American cedar with 3/4 in boards that interlock at the corner posts, so it goes together without tools. The maker says it holds up to 9.3 cubic feet of soil. The posts are routed so you can stack a second kit on top for more depth.
✅ Pros
- Tool free dovetail corners
- Untreated cedar, made in the USA
- Stackable for more depth later
❌ Cons
- Only 2 x 4 ft, so it holds a few plants
- 3/4 in boards are thinner than 2x6 lumber
Best For: a small space, herbs and salad greens, and a trial bed before you build a larger one.
Land Guard 3 Pack Galvanized Metal Raised Garden Bed, 8 x 4 x 1 ft
The standard 8 x 4 ft footprint in galvanized steel. The listing sells a pack of three beds, 12 in tall with an open bottom, so you can set them in a row or split the pack between friends. The panels bolt together with the supplied hardware, and reinforcing rods across the top keep the long sides from bowing, the same job the middle post does in a wood bed.
✅ Pros
- The standard 8 x 4 ft size, ready to assemble
- Open bottom for drainage and deep roots
- Steel will not rot
❌ Cons
- 12 in is on the shallow side for carrots and potatoes
- Fixed size: you cannot cut it to fit
Best For: filling a garden quickly with several standard sized beds.
Keep reading: the raised garden bed plans, cedar raised garden bed plans, elevated raised garden bed plans, the raised garden bed layout guide and how to fill a raised garden bed.