When to Plant Broccoli in Seattle, Washington (98113)

Location

Seattle, Washington

ZIP Code

98113

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, January 9, 2026

Transplant Outdoors Friday, February 20, 2026

Pro Tip: Start Broccoli seeds indoors 6 weeks before your last frost date, then transplant outdoors around Friday, February 20, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. italica

Days to Maturity 60 days

Mature Height 18-30"

Spread 18"

Type Head

Fruit Size Medium (4-7 inch head)

☀️ Growing Requirements

☀️

Sun

Full Sun (6 hours)

💧

Water

Regular (1-1.5 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Broccoli in Seattle?

Get your seeds now so they're ready by Friday, January 9, 2026.

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🤝 Good Companions

BeetCeleryOnionPotatoDill

⚠️ Avoid Planting Near

TomatoStrawberryPepper

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Growing Broccoli in Zone 9a

Broccoli (Brassica oleracea var. italica) is a popular garden vegetable. In Seattle, Washington, which is in USDA Hardiness Zone 9a, you should start seeds indoors around Friday, January 9, 2026.

Your average last frost date is Friday, February 20, 2026. Plan to transplant your Broccoli seedlings outdoors around Friday, February 20, 2026, about 0 weeks after your last frost date.