How to Grow Zucchini: When to Plant Zucchini in the US

Updated October 2026

A fast, rewarding warm-season crop, plus how to avoid the famous zucchini glut.

Zucchini is the fastest-producing summer vegetable you can grow. Plants go from seed to first harvest in about 8 weeks, and once they start cropping you will be picking fruit every couple of days. A single healthy plant can easily feed a household, which is exactly why so many gardeners end up with way more zucchini than they can use. Start with the calculator below to figure out how few plants you actually need.

What it looks like as it grows

🌱 Plant profile: Zucchini, with sowing times for your region, companion plants and common pests.

When to Plant Zucchini in Your Region

Zucchini is frost tender and grows fast. The North sows it once, after the last frost, in May or June. North and Central Florida, the Gulf South, the low desert and Texas sow in spring and again in late summer, and South Florida grows it from September to March. These are the planting months for each of our 18 regions, with each region's frost window. Each region links to its full vegetable planting calendar, and the Zucchini plant page shows the calendar for any region you pick.

The Pacific Northwest, the Northeast and New England, the Midwest, the Upper Midwest and the Mountain West plant zucchini in May and June. North Florida and the Gulf South plant zucchini in March and April, and August and September. Southern California and Northern California plant zucchini between March and July. The Mid-Atlantic and the Southern Plains plant zucchini between May and July.

Position and soil

Zucchini wants full sun, at least six hours a day, and rich, well-drained soil. It is a hungry, thirsty plant. Work in plenty of compost and aged manure before planting so the bed holds moisture and feeds the plant through a long season. Good drainage matters, so raised mounds or beds work well.

When to plant

Plant in spring once the soil has warmed to about 65 to 70 degrees Fahrenheit and all danger of frost has passed. In the warmest zones, like Florida and the Gulf Coast, plant in early spring and again in late summer for a fall crop, avoiding the worst of the summer heat. Cooler zones plant after their last spring frost date. See your region on the zucchini page for exact timing.

Sowing and planting

Zucchini needs warm soil to germinate. In warm zones, sow seed directly into the garden about 0.75 inch deep, planting 2 to 3 seeds per mound and thinning to the strongest seedling. In cooler zones, start seeds indoors 3 to 4 weeks before the last frost and transplant once the weather settles. Building low mounds or hills helps the soil drain and warm faster in spring.

Spacing

Give each plant room. Space bush varieties about 3 feet apart, which works out to roughly 1 square yard per plant. They grow into large, sprawling plants, and good spacing keeps air moving through the leaves, your first line of defense against powdery mildew. Climbing types like Tromboncino can be trained up a sturdy trellis to save ground space.

Watering and feeding

Zucchini are heavy feeders and need consistent water. Water deeply at the base of the plant, never over the leaves, aiming to keep the soil evenly moist rather than swinging between bone dry and soaked. Plan on roughly 2.6 gallons per plant every couple of days in hot weather. Mulch around the base to hold moisture, and feed every two to three weeks with a balanced fertilizer once flowering starts.

Pollination

Zucchini produce separate male and female flowers on the same plant. Male flowers appear first on thin, straight stems. Female flowers have a small swelling, the baby zucchini, behind the petals. Bees move pollen from male to female flowers. If a female flower is not pollinated, the small fruit behind it yellows, shrivels at the blossom end, and drops off. This poor fruit set is the most common zucchini complaint and is often mistaken for disease.

To hand pollinate, pick a male flower, peel back the petals, and dab the pollen-covered stamen onto the stigma in the center of a female flower. Do it in the morning when the flowers are freshly open.

Common problems

Powdery mildew

White powdery patches on the leaves are the most common zucchini problem, especially in humid regions and late summer. Space plants well, water at the roots in the morning rather than overhead, and remove badly affected leaves. A weekly spray of one part milk to nine parts water can slow it down. Downy mildew can also appear in humid weather.

Squash vine borer

If a healthy-looking plant suddenly wilts during the day, check the base of the stem for small entry holes and sawdust-like frass. Squash vine borer larvae tunnel inside the stem and block water flow. Slit the stem carefully with a knife to find and remove the larva, then mound soil over the damaged section so it can re-root. Wrapping the lower stem with foil and growing climbing types like Tromboncino both reduce borer damage.

Other pests

Watch for squash bugs, pickleworm, and aphids. Pick squash bugs and their bronze egg clusters off by hand, and hose aphids from soft new growth. Fruit that rots at the blossom end is usually poor pollination rather than blossom end rot, so see the pollination section above.

Harvest

Pick zucchini young at 6 to 8 inches for the best flavor and texture, and check plants every two days during peak production. Fruit grows fast in hot weather and can double in size overnight. Leave it too long and you get a baseball bat: watery, tough-skinned, and full of seeds, which also slows down new fruit. Cut the stem cleanly with a sharp knife rather than pulling. Pick often and the plant keeps producing for months.

Best zucchini varieties

What to Plant with Zucchini

Our companion data lists these plants as good neighbors for zucchini, and these to keep apart. The lists read both ways, so a plant that names zucchini as a companion appears here too. The full companion planting chart for vegetables has the same lists for 55 crops and prints on one sheet.

• Good companions for zucchini: Beans, Marigold, Nasturtium, Sweet Corn.
• Keep zucchini apart from: Potato, Pumpkin.

Zucchini at a glance

The planting figures for zucchini from our plant data, converted to inches and Fahrenheit.

Sowing zucchini seed

Sow two seeds per spot, about 3/4 inch deep, once the soil is warm, then keep the stronger seedling. Our plant data gives a soil temperature range of 64 to 86°F and about 7 days to emerge. Each plant needs about 31 inches of space, which also gives the airflow that helps against mildew. Water deeply at the base and keep the leaves dry.

Growing zucchini in containers

Zucchini can grow in a large container, at least 20 inches across, though our plant data rates it only a partial success in pots because the plants get big.

How long does zucchini take to grow?

Our plant data allows about 60 days from sowing to the first fruit. Pick zucchini young and glossy, at around finger to hand length, and cut them with a short stem. Frequent picking keeps the plant cropping, and one missed fruit swells fast and slows new ones.

Frequently asked questions

See also: Zucchini in the plant library →

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