When to Plant Kohlrabi in Pasadena, California (91105)

Location

Pasadena, California

ZIP Code

91105

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, December 28, 2025

Transplant Outdoors Sunday, January 11, 2026

Pro Tip: Start Kohlrabi seeds indoors 4 weeks before your last frost date, then transplant outdoors around Sunday, January 11, 2026.

🌿 Plant Details

Scientific Name Brassica oleracea var. gongylodes

Days to Maturity 55 days

Mature Height 12-18"

Spread 8"

Type Bulb

Fruit Size Small-Medium (2-3 inch bulb)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (consistent moisture prevents cracking)

↔️

Spacing

6" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 4-7 days

Ready to Plant Kohlrabi in Pasadena?

Get your seeds now so they're ready by Sunday, December 28, 2025.

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🤝 Good Companions

BeetOnionCucumberHerb

⚠️ Avoid Planting Near

TomatoPepperStrawberry

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Growing Kohlrabi in Zone 10a

Kohlrabi (Brassica oleracea var. gongylodes) is a popular garden vegetable. In Pasadena, California, which is in USDA Hardiness Zone 10a, you should start seeds indoors around Sunday, December 28, 2025.

Your average last frost date is Sunday, January 25, 2026. Plan to transplant your Kohlrabi seedlings outdoors around Sunday, January 11, 2026, about -2 weeks after your last frost date.