When to Plant Watermelon Radish in Boise, Idaho (83708)

Location

Boise, Idaho

ZIP Code

83708

USDA Zone

Last Frost

Friday, April 10, 2026

📅 Planting Calendar

Direct Sow Outdoors Friday, March 13, 2026

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

🌿 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 Boise?

Get your seeds now so they're ready by Friday, March 13, 2026.

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🤝 Good Companions

CarrotSpinachLettucePea

⚠️ Avoid Planting Near

Hyssop

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Growing Watermelon Radish in Zone 7a

Watermelon Radish (Raphanus sativus) is a popular garden vegetable. In Boise, Idaho, which is in USDA Hardiness Zone 7a, you should direct sow seeds around Friday, March 13, 2026.

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