When to Plant Watermelon Radish in Lothair, Montana (59461)

Location

Lothair, Montana

ZIP Code

59461

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Planting Calendar

Direct Sow Outdoors Friday, April 17, 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 Lothair?

Get your seeds now so they're ready by Friday, April 17, 2026.

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🤝 Good Companions

CarrotSpinachLettucePea

⚠️ Avoid Planting Near

Hyssop

Other Plants for Lothair

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Growing Watermelon Radish in Zone 4a

Watermelon Radish (Raphanus sativus) is a popular garden vegetable. In Lothair, Montana, which is in USDA Hardiness Zone 4a, you should direct sow seeds around Friday, April 17, 2026.

Your average last frost date is Friday, May 15, 2026. Watermelon Radish grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.