When to Plant Watermelon in Luzerne, Iowa (52257)

Location

Luzerne, Iowa

ZIP Code

52257

USDA Zone

Last Frost

Sunday, May 10, 2026

📅 Planting Calendar

Start Seeds Indoors Sunday, April 12, 2026

Transplant Outdoors Sunday, May 24, 2026

Pro Tip: Start Watermelon seeds indoors 4 weeks before your last frost date, then transplant outdoors around Sunday, May 24, 2026.

🌿 Plant Details

Scientific Name Citrullus lanatus

Days to Maturity 80 days

Mature Height 12-24"

Spread 72"

Type Vine

Fruit Size Large (10-30 lbs)

☀️ Growing Requirements

☀️

Sun

Full Sun (8+ hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

72" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 4-12 days

Ready to Plant Watermelon in Luzerne?

Get your seeds now so they're ready by Sunday, April 12, 2026.

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🤝 Good Companions

CornSunflowerMarigold

⚠️ Avoid Planting Near

Potato

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Growing Watermelon in Zone 5a

Watermelon (Citrullus lanatus) is a popular garden vegetable. In Luzerne, Iowa, which is in USDA Hardiness Zone 5a, you should start seeds indoors around Sunday, April 12, 2026.

Your average last frost date is Sunday, May 10, 2026. Plan to transplant your Watermelon seedlings outdoors around Sunday, May 24, 2026, about 2 weeks after your last frost date.