Field guide
How to grow winter squash: planting, care, and harvest guide
Winter Squash typically reaches first harvest in 80–110 days. This guide covers when to plant by USDA zone, common pests, harvest cues, and companion plants where relevant.
Open plannerWhen to plant winter squash by USDA zone group
- USDA Zones 1–4 — June
- USDA Zones 5–6 — May to June
- USDA Zones 7–8 — April to May
- USDA Zones 9–10 — March to April
- USDA Zones 11–13 — February to March
Companion plants
Good companions: Sweet Corn, beans, French Marigolds
Avoid planting with: Potatoes
Harvest
When to pick
- Skin is hard — you can't dent it with your fingernail
- Stem is dry and corky
- Color is deep and uniform for the variety
- Harvest before hard frost, but after skin fully hardens
How: Cut stem with pruners, leaving 2-3 inches of stem attached (prevents rot). Cure in sun for 10 days or a warm dry room.
Storage: Store cured squash in a cool (50-55°F), dry place. Most varieties last 2-6 months. Butternut keeps the longest.
Common pests and problems
Squash Vine Borer
Signs: Wilting vines, sawdust frass at stem base
Control: Aluminum foil on stems, row covers until flowering, Bt injection. Plant butternut squash — more resistant due to solid stems.
Squash Bug
Signs: Shield-shaped bugs, egg clusters, wilting
Control: Hand-pick, trap with boards, neem oil on nymphs. Destroy plant debris after harvest.
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