When to Plant Spaghetti Squash in Duncans Mills, California (95430)

Location

Duncans Mills, California

ZIP Code

95430

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Tuesday, January 13, 2026

Transplant Outdoors

Tuesday, February 24, 2026

Based on last frost Tuesday, February 10, 2026 · Zone 9b

Pro tip: Start Spaghetti Squash seeds indoors 4 weeks before your last frost date, then transplant outdoors around Tuesday, February 24, 2026.

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🌿 Plant Details

Scientific Name Cucurbita pepo

Days to Maturity 90 days

Mature Height 12-18"

Spread 60"

Type Vine

Fruit Size Large (4-8 lbs)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1 inch/week)

↔️

Spacing

48" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 5-10 days

Ready to Plant Spaghetti Squash in Duncans Mills?

Get your seeds now so they're ready by Tuesday, January 13, 2026.

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🤝 Good Companions

CornBeanMarigoldNasturtium

⚠️ Avoid Planting Near

Potato

🤝

Full Companion Planting Guide for Spaghetti Squash

See which plants help Spaghetti Squash thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Cure squash for 1 month after harvest before extracting seeds.

Processing

Scoop seeds, rinse thoroughly, dry flat on screen for 2 weeks.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Spaghetti squash is C. pepo — crosses with zucchini, acorn, and pumpkin. Isolate by 500 feet.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 2 plants of Spaghetti Squash. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Spaghetti Squash in Duncans Mills, California? +

In Duncans Mills (Zone 9b), start Spaghetti Squash seeds indoors around Tuesday, January 13, 2026 and transplant outdoors around Tuesday, February 24, 2026.

What is the last frost date for Duncans Mills, California? +

The average last spring frost date for Duncans Mills, California (ZIP 95430) is around Tuesday, February 10, 2026. This is based on NOAA climate normals for USDA Zone 9b.

How long does Spaghetti Squash take to grow? +

Spaghetti Squash typically matures in about 90 days from transplanting. In Duncans Mills, that means you can expect harvest around Tuesday, February 24, 2026 plus 90 days.

Should I start Spaghetti Squash indoors or direct sow in California? +

Spaghetti Squash should be started indoors 4 weeks before your last frost date. In Duncans Mills, that means starting around Tuesday, January 13, 2026.

📚 More Spaghetti Squash Planting Guides

🗺️

Spaghetti Squash in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9b Spaghetti Squash Guide

All cities in your zone · Avg dates

→

Other Plants for Duncans Mills

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Growing Spaghetti Squash in Zone 9b

Spaghetti Squash (Cucurbita pepo) is a popular garden vegetable. In Duncans Mills, California, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, January 13, 2026.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Spaghetti Squash seedlings outdoors around Tuesday, February 24, 2026, about 2 weeks after your last frost date.