When to Plant Watermelon Radish in Fort Mill, South Carolina (29708)

Location

Fort Mill, South Carolina

ZIP Code

29708

USDA Zone

Last Frost

Friday, March 20, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Friday, February 20, 2026

Based on last frost Friday, March 20, 2026 · Zone 8a

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 Fort Mill?

Get your seeds now so they're ready by Friday, February 20, 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 Fort Mill, South Carolina? +

In Fort Mill (Zone 8a), direct sow Watermelon Radish outdoors around Friday, February 20, 2026.

What is the last frost date for Fort Mill, South Carolina? +

The average last spring frost date for Fort Mill, South Carolina (ZIP 29708) is around Friday, March 20, 2026. This is based on NOAA climate normals for USDA Zone 8a.

How long does Watermelon Radish take to grow? +

Watermelon Radish typically matures in about 60 days from direct sowing. In Fort Mill, that means you can expect harvest around Friday, February 20, 2026 plus 60 days.

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

Watermelon Radish does best when direct sown outdoors. In Fort Mill, sow directly around Friday, February 20, 2026.

📚 More Watermelon Radish Planting Guides

🗺️

Watermelon Radish in South Carolina

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 8a Watermelon Radish Guide

All cities in your zone · Avg dates

→

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Growing Watermelon Radish in Zone 8a

Watermelon Radish (Raphanus sativus) is a popular garden vegetable. In Fort Mill, South Carolina, which is in USDA Hardiness Zone 8a, you should direct sow seeds around Friday, February 20, 2026.

Your average last frost date is Friday, March 20, 2026. Watermelon Radish grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.