When to Plant Radicchio in Tucson, Arizona (85708)

Location

Tucson, Arizona

ZIP Code

85708

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, January 13, 2026

Transplant Outdoors Tuesday, January 27, 2026

Pro Tip: Start Radicchio seeds indoors 4 weeks before your last frost date, then transplant outdoors around Tuesday, January 27, 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 Tucson?

Get your seeds now so they're ready by Tuesday, January 13, 2026.

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Growing Radicchio in Zone 9b

Radicchio (Cichorium intybus) is a popular garden vegetable. In Tucson, Arizona, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, January 13, 2026.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Radicchio seedlings outdoors around Tuesday, January 27, 2026, about -2 weeks after your last frost date.