When to Plant Hollyhock in Gilroy, California (95021)

Location

Gilroy, California

ZIP Code

95021

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, December 30, 2025

Transplant Outdoors Tuesday, February 24, 2026

Pro Tip: Start Hollyhock seeds indoors 6 weeks before your last frost date, then transplant outdoors around Tuesday, February 24, 2026.

🌿 Plant Details

Scientific Name Alcea rosea

Days to Maturity 365 days

Mature Height 48-96"

Spread 24"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 10-14 days

Ready to Plant Hollyhock in Gilroy?

Get your seeds now so they're ready by Tuesday, December 30, 2025.

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Growing Hollyhock in Zone 9b

Hollyhock (Alcea rosea) is a popular garden vegetable. In Gilroy, California, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, December 30, 2025.

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