When to Plant Radicchio in Bullhead, South Dakota (57621)

Location

Bullhead, South Dakota

ZIP Code

57621

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, April 7, 2026

Transplant Outdoors Tuesday, April 21, 2026

Pro Tip: Start Radicchio seeds indoors 4 weeks before your last frost date, then transplant outdoors around Tuesday, April 21, 2026.

🌿 Plant Details

Scientific Name Cichorium intybus

Days to Maturity 80 days

Mature Height 6-12"

Spread 10"

Type Head

Fruit Size Small-Medium (fist-sized head)

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Regular (keep moist)

↔️

Spacing

10" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Radicchio in Bullhead?

Get your seeds now so they're ready by Tuesday, April 7, 2026.

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Growing Radicchio in Zone 4b

Radicchio (Cichorium intybus) is a popular garden vegetable. In Bullhead, South Dakota, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, April 7, 2026.

Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Radicchio seedlings outdoors around Tuesday, April 21, 2026, about -2 weeks after your last frost date.