When Should You Plant Winter Squash?
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GardenSays
Sow winter squash plants outside May 20 – Jun 4 — after frost danger passes and soil has warmed to ~65°F.
- Sow from
- May 20 – Jun 4
- Last sowing
- May 28
- Last frost (typ.)
- May 5
Winter squash plants are very frost-tender and germinate poorly in cold, wet ground — unlike peas or lettuce, you wait until AFTER the last frost (May 5) and until the soil warms. Sowing too early into cold spring soil rots the seed. The safe window in Minneapolis, MN opens around May 20.
Do this this week
- 1.Too late to sow winter squash plants this year — the last sowing that could mature before frost was ~May 28
- 2.Plan next spring: sow from May 20 once soil is warm
Calculated result · 3 verified sources · Checked 2026-07-18 · How we decide
Why
Your season fits winter squash plants comfortably — first sowings mature well before the typical first frost (Oct 5), and later sowings extend the harvest.
- Warm-season crops need warm soil to germinate: cold, wet spring ground causes seed rot and poor stands, which is why they go in after frost, not before.
- Days-to-maturity versus your frost-free season sets how late you can keep sowing.
When this doesn't apply
- MN guide states 'late May to early June' planting; converted to a Minneapolis-relative (last frost ~May 5) window and labeled as our estimate — the source itself gives a calendar date, not a frost offset.
- A cold snap after sowing can still kill seedlings — hold off if a late frost is forecast, even inside the window.
How this was calculated
- 1. Last spring frostMay 5Source guidance
Minneapolis, MN: typical (50% probability) last 32°F frost
- 2. First sowing windowMay 20 – Jun 4Calculated result
Winter squash is very frost-tender — sow only after frost danger passes AND soil has warmed to ~65°F (15-30 days after the last frost)
- 3. Last safe sowingMay 28Calculated result
90-120 days to maturity must finish ~10 days before the typical first fall frost (Oct 5)
Data sources
- University of Minnesota Extension — Growing pumpkins and winter squash in home gardens — In Minnesota, planting is typically late May to early June. Plant seeds 3/4 inch deep, 24-36 inches apart (bush types); rows 5-6 feet apart. Soil pH 6.0-6.5, moisture-retentive yet well drained. (checked 2026-07-18)
- NOAA NCEI — 1991-2020 U.S. Climate Normals (freeze date probabilities) (checked 2026-07-15)
- National Gardening Association — frost date lookup (checked 2026-07-15)
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People also ask
When are pumpkins ready to harvest?
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