When to Plant Squash
Published: April 21, 2026
Summer squash is among the most productive garden vegetables — one plant can produce a squash every day at peak. Timing planting after full soil warm-up prevents rotting and disease.
When to plant squash
- Start seeds indoors: 3 weeks before last frost
- Direct sow outdoors: 1 week after last frost
- Minimum soil temperature: 65°F
- Days to harvest: 45–65 days
- Sun requirement: Full sun (8+ hours)
- Spacing: 36 inches apart
- Water: 1.5 inches per week
- Fall crop: Yes — plant 10 weeks before first fall frost
Growing Tips for Squash
- •Plant only after soil is fully warm (65°F+) — cold soil rots seeds and creates disease-prone seedlings.
- •Squash vine borer kills plants from the inside in July–August in the eastern US; plant a backup crop in early July.
- •Hand-pollinate using a small brush if fruit falls off small — squash need bee visits for fruit set.
- •Harvest at 6–8 inches for summer squash; letting squash grow large signals the plant to stop producing.
Companion Planting for Squash
✅ Plant squash with
- • Corn
- • Bush Beans
- • Nasturtium
- • Marigold
- • Dill
❌ Avoid planting near
- • Potato
- • Fennel
Common Squash Pests and Problems
Regional pest pressure varies — see your state guide below for state-specific pest calendars and treatment timing.
Squash Planting Dates by State
Select your state for exact sow and transplant dates based on local frost calendars.
Frequently Asked Questions
When do I plant squash?
Plant squash 1 week after your last frost date, once soil is above 65°F. Squash planted in cold soil is vulnerable to rot and disease — warm soil is more important than the frost calendar for this crop.
Should I start squash seeds indoors?
Only if your season is very short (Zones 3–5) — start 3 weeks before last frost in large peat pots. In most climates, direct sowing works better. Squash grow extremely fast once conditions are right, and they dislike root disturbance at transplanting.
How do I prevent squash vine borer?
Squash vine borer moths lay eggs at the stem base in early summer (June–July in most regions). Plant a second succession crop in early July after the moth season peaks. Wrap the base of stems in aluminum foil as a physical barrier, or use row covers until flowering begins.
Why does my squash have flowers but no fruit?
Squash produce male flowers first, then female flowers (identifiable by the tiny squash at the base). If bees are absent, hand-pollinate by brushing pollen from a male flower into the center of a female flower. Missing pollination causes small squash to yellow and drop off.
What to plant with squash?
The Three Sisters companion planting combines corn (trellis for beans), beans (nitrogen fixing), and squash (living mulch that shades out weeds). Nasturtiums and marigolds deter squash bugs and beetles. Avoid potatoes and fennel.