When to Plant Watermelon Radish in Fresno, California (93708)

Location

Fresno, California

ZIP Code

93708

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Tuesday, January 13, 2026

Based on last frost Tuesday, February 10, 2026 · Zone 9b

Pro tip: Sow Watermelon Radish directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Raphanus sativus

Days to Maturity 60 days

Mature Height 6-10"

Spread 4"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

4" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 3-7 days

Ready to Plant Watermelon Radish in Fresno?

Get your seeds now so they're ready by Tuesday, January 13, 2026.

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🤝 Good Companions

CarrotSpinachLettucePea

⚠️ Avoid Planting Near

Hyssop

🤝

Full Companion Planting Guide for Watermelon Radish

See which plants help Watermelon Radish thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow plants to bolt and seed pods to fully dry and turn tan on the stalk.

Processing

Thresh dried pods, winnow to remove chaff, dry seeds 1 week before storing.

Seed Viability

Up to 5 years when stored cool, dark, and dry.

Pro Tip

Will cross with other radish varieties — isolate by 1000 feet to maintain the distinctive interior color.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 9 per sq ft of Watermelon Radish. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Watermelon Radish in Fresno, California? +

In Fresno (Zone 9b), direct sow Watermelon Radish outdoors around Tuesday, January 13, 2026.

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

The average last spring frost date for Fresno, California (ZIP 93708) is around Tuesday, February 10, 2026. This is based on NOAA climate normals for USDA Zone 9b.

How long does Watermelon Radish take to grow? +

Watermelon Radish typically matures in about 60 days from direct sowing. In Fresno, that means you can expect harvest around Tuesday, January 13, 2026 plus 60 days.

Should I start Watermelon Radish indoors or direct sow in California? +

Watermelon Radish does best when direct sown outdoors. In Fresno, sow directly around Tuesday, January 13, 2026.

📚 More Watermelon Radish Planting Guides

🗺️

Watermelon Radish in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9b Watermelon Radish Guide

All cities in your zone · Avg dates

→

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Growing Watermelon Radish in Zone 9b

Watermelon Radish (Raphanus sativus) is a popular garden vegetable. In Fresno, California, which is in USDA Hardiness Zone 9b, you should direct sow seeds around Tuesday, January 13, 2026.

Your average last frost date is Tuesday, February 10, 2026. Watermelon Radish grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.