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How to Start a Raised Bed Vegetable Garden (Beginner Guide)
One bed, done right. Size, sun, soil, first crops and the beginner mistakes that cost a season.
Updated 2026-09-11
Start with one bed
The most common beginner mistake is building four beds and planting all of them in May. One 4×8 ft bed (or two 4×4s) feeds a household salad-and-tomato habit and takes about 20 minutes a week once it is running. Add a second bed the year you wish for more room, not before.
Where it goes
- Sun: 6–8 hours of direct sun. Watch the spot at 10am, 1pm and 4pm on a sunny day before you build. Tomatoes, peppers and squash need the full 8; greens and herbs manage on 5.
- Water: within hose reach. A bed you have to carry water to gets neglected by July.
- Width: 4 ft maximum so you can reach the middle without stepping in the bed. Length is up to you.
- Height: 12 in is fine for greens and herbs; 15–17 in lets you grow carrots, potatoes and deep-rooted tomatoes and is easier on your back.
- Ground: level within an inch, on grass, gravel or bare soil. Lay cardboard on grass to smother it.
Metal, wood or kit?
Cedar boards last 8–12 years and look classic. Galvanized metal kits (Vego, Birdies) last 20+ years, assemble in an hour and are usually cheaper per year. Untreated pine is the budget option but rots in 3–5 years. See the raised bed kit comparison.
What the first bed costs
| Item | 4×8 ft, 17 in tall |
|---|---|
| Metal kit (or cedar lumber and screws) | $190 (about $110 in cedar) |
| Soil: 1.7 cu yd bulk, delivered | $90–150 (bagged: $200–300) |
| Seeds and a few transplants | $30–50 |
| Drip kit and timer | $35–60 |
| Straw mulch, one bale | $10 |
Budget around $350 for a bed that produces for twenty years.
When to build
Fall or early spring, whenever the ground is not frozen. A bed filled in October settles over winter and is ready to plant the day the soil warms. Building in May works too; water the fresh mix well and top it up after a week.
Filling it without spending $200 on bagged soil
For a bed deeper than 12 in, fill the bottom third with logs, branches and leaves (hügelkultur style), then top with a mix of roughly 60% topsoil/garden soil, 30% compost and 10% aeration (perlite, coarse bark or coir). Buy soil in bulk by the yard if you have more than two beds. Full detail in the raised bed soil guide.
What to plant first
Pick crops that forgive mistakes: bush beans, zucchini, cherry tomatoes, lettuce, radishes, kale, basil. Skip cauliflower, celery and melons in year one. Use the planting calendar to get your dates from your frost date, and the companion planting chart to decide what shares the bed.
A first-year 4×8 that works: three tomato plants along the north edge, staked; four peppers and four basil in the next row; one zucchini in a 2×2 corner with 8 sq ft of bush beans beside it; and the front 2×8 strip for lettuce, radishes and kale, resown every three weeks. More layouts with plant counts in the layout plans.
Timing by zone
Warm-season crops (tomatoes, peppers, beans, squash, basil) go in after the last spring frost, once nights stay above 50°F. Cool-season crops (lettuce, spinach, radishes, kale, peas) go in 2–4 weeks before the last frost. Last-frost dates: zone 4 late May, zone 5 mid-May, zone 6 late April, zone 7 mid-April, zone 8 late March, zone 9 February. Zones 8–10 grow greens through winter and rest in high summer instead.
The weekly routine
- Water deeply 2–3 times a week (daily for containers in heat). A 4×8 bed needs about 20 gallons a week, more in July; a finger 2 in into the soil tells you when. A drip kit on a timer removes this job entirely; the $40 drip setup takes an hour.
- Pull weeds while they are small; mulch with straw or shredded leaves to stop most of them.
- Harvest often: beans, zucchini and lettuce produce more the more you pick.
- Write down what you planted and when. Next spring you will thank yourself.
Mistakes to skip
- Planting warm-season crops before nights stay above 50°F.
- Filling a bed with pure compost (it slumps and stays soggy).
- Crowding: follow the packet spacing even though the bed looks empty in May.
- Buying gadgets before you have grown one season with a trowel and a hose.
- Watering a little every day. Shallow watering grows shallow roots that wilt on the first hot afternoon.
FAQ
How deep should a raised bed be for vegetables?
12 in grows greens, herbs, beans and bush tomatoes. 15–17 in grows everything, including carrots, potatoes and full-size tomatoes, without digging the ground underneath. Anything deeper is for comfort, not the plants.
Do I need to remove the grass under a raised bed?
No. Lay flattened cardboard over the grass, overlapping the edges, wet it and set the bed on top. The grass dies in weeks.
What is the easiest vegetable to grow in a raised bed?
Bush beans, followed by zucchini, radishes and leaf lettuce. All four go from seed to harvest in under 60 days and tolerate uneven watering.
How many plants fit in a 4×8 raised bed?
With square-foot spacing: 4 lettuce or 9 bush beans per sq ft, 1 pepper per sq ft, 1 tomato per 2 sq ft, 1 zucchini per 4 sq ft. A 4×8 bed holds 3 tomatoes, 4 peppers, 1 zucchini, herbs and 12 sq ft of greens and roots.
Can I put a raised bed on concrete or a patio?
Yes, if it is at least 12 in deep and drains freely. Add a layer of landscape fabric to stop soil washing out, and expect it to dry faster than a bed on soil.
What I'd buy first
Vego Garden 17" Tall 9-in-1 Modular Metal Raised Bed
Modular galvanized bed, 17 in tall (deep enough for root crops), 9 layouts from one kit. The bed I'd start with if I only bought one.
Check price via Vego GardenBotanical Interests Beginner Vegetable Seed Collection
Beginner-proof varieties (bush beans, zucchini, lettuce, radish, cherry tomato) with the best planting instructions on the packet.
Check price via Botanical InterestsRaindrip Automatic Container & Raised Bed Drip Kit
Complete kit with timer for 2-4 beds; the single biggest time-saver for a beginner.
Check price via Amazon Associates (US)
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