When to Plant Spaghetti Squash in Bothell, Washington (98021)

Location

Bothell, Washington

ZIP Code

98021

USDA Zone

Last Frost

Sunday, March 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, February 15, 2026

Transplant Outdoors

Sunday, March 29, 2026

Based on last frost Sunday, March 15, 2026 · Zone 8b

Pro tip: Start Spaghetti Squash seeds indoors 4 weeks before your last frost date, then transplant outdoors around Sunday, March 29, 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 Bothell?

Get your seeds now so they're ready by Sunday, February 15, 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 Bothell, Washington? +

In Bothell (Zone 8b), start Spaghetti Squash seeds indoors around Sunday, February 15, 2026 and transplant outdoors around Sunday, March 29, 2026.

What is the last frost date for Bothell, Washington? +

The average last spring frost date for Bothell, Washington (ZIP 98021) is around Sunday, March 15, 2026. This is based on NOAA climate normals for USDA Zone 8b.

How long does Spaghetti Squash take to grow? +

Spaghetti Squash typically matures in about 90 days from transplanting. In Bothell, that means you can expect harvest around Sunday, March 29, 2026 plus 90 days.

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

Spaghetti Squash should be started indoors 4 weeks before your last frost date. In Bothell, that means starting around Sunday, February 15, 2026.

📚 More Spaghetti Squash Planting Guides

🗺️

Spaghetti Squash in Washington

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 8b Spaghetti Squash Guide

All cities in your zone · Avg dates

→

Other Plants for Bothell

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Growing Spaghetti Squash in Zone 8b

Spaghetti Squash (Cucurbita pepo) is a popular garden vegetable. In Bothell, Washington, which is in USDA Hardiness Zone 8b, you should start seeds indoors around Sunday, February 15, 2026.

Your average last frost date is Sunday, March 15, 2026. Plan to transplant your Spaghetti Squash seedlings outdoors around Sunday, March 29, 2026, about 2 weeks after your last frost date.