How to Start Squash Seeds
Fast-growing summer and winter squash - from seed to harvest in weeks!
Don't Start Too Early!
Squash grows incredibly fast and hates being rootbound. Start only 2-4 weeks before transplanting, and use large pots or peat pots. Rootbound squash seedlings often fail after transplanting.
Step-by-Step Guide
Use Large Pots
Start in 3-4" peat pots or soil blocks. Squash grows fast and needs room! Small cells cause problems. Use moist seed starting mix.
Plant Seeds
Plant 1-2 seeds per pot, 1 inch deep, pointed end down. Cover and water gently. Large seeds are easy to handle!
Provide Heat
Use a heat mat at 80-90°F for fastest germination (4-5 days). Without heat, germination takes 7-10 days and may be spotty.
Add Light
Once sprouted, remove from heat mat and provide 12-14 hours of strong light. Squash grows fast and needs lots of light to stay compact.
Thin to One
If both seeds sprout, snip the weaker one at soil level. Don't pull - you'll disturb the roots of the keeper.
Harden Off & Transplant
Harden off for 5-7 days, then transplant when seedlings have 2-3 true leaves. Plant the entire peat pot - squash hates root disturbance!
Summer vs Winter Squash
Summer Squash
Zucchini, yellow squash, pattypan
- • Harvest immature (soft skin)
- • 45-65 days to harvest
- • Eat fresh, don't store long
- • Very productive!
Winter Squash
Butternut, acorn, spaghetti squash
- • Harvest mature (hard skin)
- • 80-120 days to harvest
- • Stores for months
- • Needs more space
Frequently Asked Questions
When should I start squash seeds indoors?
Start squash only 2-4 weeks before your transplant date (which is 1-2 weeks after last frost). Squash grows extremely fast and becomes rootbound quickly. Don't start too early!
Should I direct sow or transplant squash?
Direct sowing works well if your season is long enough. Transplanting gives a 2-3 week head start in short-season areas. Use peat pots to minimize transplant shock - squash hates root disturbance.
What temperature do squash seeds need?
Squash seeds germinate best at 70-95°F (optimal 85-90°F). They germinate quickly (4-7 days) in warm soil. Below 60°F, germination is poor or fails. Use a heat mat for best results.
Which way up do I plant squash seeds?
Plant squash seeds pointed end down, about 1 inch deep. The pointed end is where the root emerges. If unsure, plant flat - the seedling will figure it out.