How to grow zucchini / summer squash

Cucurbita pepo · Cucurbitaceae · Vegetable

Zucchini / Summer Squash is a warm-season vegetable in the Cucurbitaceae family, grown either from a direct sowing or from transplants. It wants full sun (six or more hours of direct light) and consistent moisture — it resents drying out. From sowing to first pick is about 45–60 days. It is killed by frost, so nothing goes outside until the danger has passed and the soil has warmed.

Grower’s note: One or two plants feed a household. A second sowing in early-mid summer dodges the first vine borer generation.

Sowing

Sow about 1″ deep, into soil between 60–95°F — germination is quickest near 85°F. It comes up fast (5–10 days). For an early crop, start seed indoors about 3 weeks before your last spring frost and grow it under bright light.

Spacing & layout

Give each plant about 30″ along the row with roughly 42″ between rows. On a square-foot grid that is one plant per 2 square feet. Allow at least 14″ of loose, workable soil for the roots. It grows well in containers at least 16″ deep.

Fitting it to your season

Zucchini / Summer Squash needs roughly 45–60 frost-free days to crop. Where the season is shorter than that, start it indoors and choose the earliest-maturing varieties, or grow it in a container you can move under cover on cold nights. In long, hot-summer regions it can often be planted twice — once in spring and again in mid-to-late summer for a fall harvest.

Quick facts

When to plant zucchini / summer squash

Companions

Common problems

Pests: squash vine borer, squash bug, striped cucumber beetle, aphids.

Diseases & disorders: powdery mildew, bacterial wilt, blossom-end rot (calcium disorder).

Same family (Cucurbitaceae)

Rotate these so they don’t follow each other in the same bed year to year.

Figures are typical home-garden ranges from Cooperative Extension planting guides, cross-checked against multiple state sources. Your variety and conditions will vary.