Raised beds are one of the easiest ways to start a vegetable garden. They warm up faster in spring, drain well, keep paths separate from growing areas and let you build good soil from day one, even if your native ground is rocky, compacted or heavy clay. They also make gardening easier on your back and knees.
This guide walks through every decision a beginner needs to make: where to put the bed, how big to make it, what to build it from, how to fill it and what to plant in the first season.
Step 1: Choose the Right Spot
Location matters more than any other decision.
Sunlight
Most vegetables, especially fruiting crops like tomatoes, peppers, squash and cucumbers, need at least six to eight hours of direct sun a day. Leafy greens and many herbs can manage with somewhat less. Watch your yard for a full day and note when each area gets sun.
Water Access
You will water often in summer. Place beds within easy reach of a hose or plan for drip irrigation or soaker hoses.
Level Ground and Drainage
A fairly level spot makes building easier and helps water soak in evenly. Avoid low areas where water pools after rain.
Convenience
A bed near the kitchen door gets more attention than one at the far end of the yard. You are more likely to harvest, weed and spot problems early when you walk past it every day.
Step 2: Decide on Size and Height
Width
Keep beds no wider than about 4 feet if you can reach from both sides, or about 2 to 3 feet if the bed is against a fence or wall. You should be able to reach the center without stepping into the bed, because stepping compacts the soil.
Length
Length is flexible. Common sizes are 4 by 4 feet, 4 by 8 feet and 3 by 6 feet. A 4-by-8-foot bed is a popular starting point because lumber often comes in 8-foot lengths.
Height
- 6 to 12 inches: Enough for most vegetables when placed over loosened native soil.
- 12 to 18 inches: Better for poor or compacted ground and easier on the back.
- 24 inches and higher: Easier access for people who prefer not to bend, but requires much more soil to fill.
Paths
Leave paths at least 18 to 24 inches wide, or wider if you need room for a wheelbarrow or mobility aids.
Step 3: Choose Your Materials
Untreated Cedar or Redwood
Naturally rot-resistant and attractive. More expensive than pine but lasts longer.
Untreated Pine or Fir
Inexpensive and easy to find, but it will rot faster, often within a few years in contact with moist soil.
Pressure-Treated Lumber
Modern residential pressure-treated wood no longer uses the arsenic-based treatment that was phased out for residential use in the early 2000s. Many gardeners use newer treated lumber, while others prefer to avoid it or line it. If you are unsure, choose naturally rot-resistant wood or another material.
Galvanized or Coated Metal
Metal beds are long-lasting and come in many sizes and colors. They can warm up in hot sun, which may matter in very hot climates.
Stone, Brick or Concrete Block
Durable and permanent. Some gardeners avoid old reclaimed materials of unknown origin.
Kits
Raised bed kits make assembly easy and come in wood, metal and composite. Compare thickness, corner hardware and dimensions before buying.
Avoid
- Old railroad ties, which are treated with creosote
- Tires
- Wood of unknown origin that may have been treated with older preservatives
Step 4: Prepare the Ground
- Remove grass and weeds where the bed will sit, or smother them with cardboard (remove tape and labels first).
- Loosen the native soil with a garden fork so roots can grow deeper.
- Add hardware cloth across the bottom if burrowing animals like gophers or voles are common in your area.
- Avoid weed fabric directly under beds for vegetables in most cases; roots benefit from reaching native soil.
Step 5: Fill the Bed
Raised beds need loose, rich soil that holds moisture but drains well.
A Simple Mix
Many gardeners use a blend of roughly:
- Topsoil or a quality garden soil for structure
- Compost for nutrients and organic matter
- An aeration material such as fine bark, which some gardeners add for drainage
Some suppliers sell a ready-made raised bed mix by the bag or in bulk. For larger or taller beds, buying in bulk is usually far cheaper than bags.
Filling Deep Beds
For very tall beds, some gardeners fill the bottom with logs, branches and leaves (a method sometimes called hugelkultur) and put quality soil on top. Expect the material to settle over time.
Calculating How Much Soil You Need
Multiply length × width × depth in feet to get cubic feet. A 4-by-8-foot bed that is 1 foot deep holds 32 cubic feet. Divide by 27 to get cubic yards, the unit bulk suppliers use.
Make Your Own Compost
Over time, you can top up beds with homemade compost. See our guide to composting at home.
Step 6: Plan the Layout
Square-Foot Style Planting
Divide the bed into a grid of 1-foot squares and plant a set number of plants per square based on size. For example, one tomato might take one or more squares, while radishes or carrots can fit many per square.
Put Tall Plants on the North Side
In the Northern Hemisphere, place tall crops like tomatoes, pole beans and trellised cucumbers on the north side so they do not shade shorter plants.
Leave Room for Support
Install trellises and cages at planting time.
Sample 4-by-8 Beginner Layout
| Section | Plants |
|---|---|
| North end | 2 tomato plants with cages, basil between |
| Middle | Bush beans, peppers |
| South end | Lettuce, radishes, carrots, onions |
| Edges | Marigolds or nasturtiums, herbs |
See our companion planting guide for more ideas.
Step 7: Plant and Care
When to Plant
Check your area’s average last frost date. Cool-season crops like lettuce, peas and radishes can go in before the last frost, while warm-season crops like tomatoes, peppers and squash should wait until after it, when soil has warmed. Your local cooperative extension service publishes planting calendars.
Watering
Raised beds drain faster than in-ground beds and may need more frequent watering. Water deeply at the base of plants rather than lightly on leaves. Mulch helps keep soil moist.
Mulch
Straw, shredded leaves or fine bark mulch helps retain moisture, suppress weeds and moderate soil temperature.
Feeding
Add compost each season. Many vegetables also benefit from a balanced fertilizer; follow the label directions.
Frequently Asked Questions
How deep should a raised bed be for vegetables?
Many vegetables grow well in beds 8 to 12 inches deep over loosened native soil. Deep-rooted crops and poor native soil benefit from deeper beds.
Should I put anything in the bottom of a raised bed?
Cardboard can smother grass, and hardware cloth can keep out burrowing animals. Avoid plastic, which blocks drainage.
Can I use bagged potting mix in a raised bed?
Potting mix is designed for containers and can be expensive for large beds. A raised bed or garden soil blend with compost is usually more cost-effective.
How long do wooden raised beds last?
It depends on the wood, climate and moisture. Cedar and redwood generally last longer than pine.
Do raised beds need to be refilled?
Soil settles and breaks down over time. Top up with compost each year.
The Bottom Line
Start with one or two beds in a sunny, convenient spot. Keep them narrow enough to reach the center, choose durable safe materials, fill them with a quality soil and compost blend and plan a simple layout with tall plants on the north side. A well-built raised bed can make your first vegetable garden a success and grow with you for years.
Editorial note: Backyard Bloomer is independent and reader-supported. This guide is based on research into manufacturer documentation, published specifications and widely accepted best practices; we have not been paid to mention any product. If we add affiliate links in the future, they will be clearly disclosed per our Affiliate Disclosure.