vine · direct sow · advanced
Watermelon: how much to plant.
A family of 4 eating watermelon a few times a week needs about 2 plants in ~42 sq ft, worth about $24 a year at the store. Here are the exact numbers for your household, and when to plant in every zone.
How much to plant
Plants, space, seeds, and value.
Counts assume about 3 servings per person per week with a germination buffer built in. Store value uses ~$0.60/lb retail, an estimate that varies by region and season.
| Household | Plants | Bed space | Seeds to buy | Store value / yr |
|---|---|---|---|---|
| 1 person | 1 | ~21 sq ft | ~2 | ~$12 |
| 2 people | 1 | ~21 sq ft | ~2 | ~$12 |
| 4 people | 2 | ~42 sq ft | ~4 | ~$24 |
| 6 people | 2 | ~42 sq ft | ~4 | ~$24 |
Spacing
36" in row · 84" between rows
Sow depth
1"
Days to harvest
85 from seed
When to plant
Sow windows by USDA zone, 2026.
Zone dates are typical, not exact. The free planner uses your ZIP code's frost dates, not just the zone, and shifts every window to match.
| Zone | Spring sow window | Fall sow window |
|---|---|---|
| Zone 3 | Jun 5 – Jun 15 | — |
| Zone 4 | May 31 – Jun 25 | — |
| Zone 5 | May 21 – Jul 5 | — |
| Zone 6 | May 11 – Jun 27 | — |
| Zone 7 | Apr 26 – Jun 12 | — |
| Zone 8 | Apr 15 – Jun 1 | — |
| Zone 9 | Mar 13 – Apr 29 | — |
| Zone 10 | Feb 21 – Apr 9 | — |
Know when it's time to plant
Give us your ZIP and we'll email you a planting checklist for your exact frost dates, this month's list right now, then once a month when sow windows open.
One email a month, only when there's something to plant. Unsubscribe anytime.
Know before you grow
The practical stuff.
Ready to pick when
Three checks together: the tendril nearest the fruit is brown and dry, the belly spot is buttery yellow, and it sounds hollow when thumped.
Don't wait: Watermelon does not ripen off the vine, but overripe flesh goes mealy, so pick within a week of the signs.
Yield
About 2 counts per plant over ~3 productive weeks (~20 lb).
Watch for
Cucumber beetles · Aphids · Anthracnose & gummy stem blight, the pest guide covers organic fixes for each, and Pest Radar shows what gardeners near you are reporting right now.
Neighbors
Plays well with bush bean.
On the plate (per 100 g, USDA)
30 kcal · 0.4 g fiber · 8.1 mg vitamin C · 112 mg potassium
When to plant watermelon in your state
Pick your state for exact sow windows.
Each page keys watermelonto that state's typical frost dates, with spring and fall windows and the indoor-start date where it helps.
Stop guessing. Get your exact numbers.
Tell the free planner what you want to eat and who you're feeding. It returns plant counts, spacing, and frost-safe sow dates for your ZIP code, not just your zone, in about 60 seconds.
Watermelon planting questions
How many watermelon plants do I need per person?+
For steady eating (about 3 servings a week), plan on roughly 1 plant per person. A family of 4 needs about 2 plants, which takes around 42 sq ft of bed space.
How much space does watermelon need?+
Space plants 36" apart in the row with 84" between rows. Sow 1" deep. Direct sow in the bed.
When should I plant watermelon?+
It depends on your frost dates. Spring sowing is keyed to your last spring frost. The zone table on this page shows typical windows; enter your ZIP in the free planner for dates tuned to your exact location, not just your zone.
Is growing watermelon worth it?+
At about $0.60/lb retail and ~20 lb per plant, a family-of-4 planting is worth about $24 a year at the store. Prices vary by region and season, so treat it as an estimate.