When to Plant Rhubarb in Berkeley, California (94708)

Location

Berkeley, California

ZIP Code

94708

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, November 30, 2025

Transplant Outdoors

Sunday, February 8, 2026

Based on last frost Sunday, January 25, 2026 · Zone 10a

Pro tip: Start Rhubarb seeds indoors 8 weeks before your last frost date, then transplant outdoors around Sunday, February 8, 2026.

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🌿 Plant Details

Scientific Name Rheum rhabarbarum

Days to Maturity 365 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-21 days

Ready to Plant Rhubarb in Berkeley?

Get your seeds now so they're ready by Sunday, November 30, 2025.

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🛠️ 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

Allow flower stalks to develop in early summer. Harvest when seeds in the large seed clusters turn brown.

Processing

Cut dried seed stalks, thresh to release seeds, winnow lightly.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Rhubarb seeds don't grow true to variety. For identical plants, propagate by crown division in early spring.

Frequently Asked Questions

When should I plant Rhubarb in Berkeley, California? +

In Berkeley (Zone 10a), start Rhubarb seeds indoors around Sunday, November 30, 2025 and transplant outdoors around Sunday, February 8, 2026.

What is the last frost date for Berkeley, California? +

The average last spring frost date for Berkeley, California (ZIP 94708) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.

How long does Rhubarb take to grow? +

Rhubarb typically matures in about 365 days from transplanting. In Berkeley, that means you can expect harvest around Sunday, February 8, 2026 plus 365 days.

Should I start Rhubarb indoors or direct sow in California? +

Rhubarb should be started indoors 8 weeks before your last frost date. In Berkeley, that means starting around Sunday, November 30, 2025.

📚 More Rhubarb Planting Guides

🗺️

Rhubarb in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10a Rhubarb Guide

All cities in your zone · Avg dates

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Growing Rhubarb in Zone 10a

Rhubarb (Rheum rhabarbarum) is a popular garden vegetable. In Berkeley, California, which is in USDA Hardiness Zone 10a, you should start seeds indoors around Sunday, November 30, 2025.

Your average last frost date is Sunday, January 25, 2026. Plan to transplant your Rhubarb seedlings outdoors around Sunday, February 8, 2026, about 2 weeks after your last frost date.