When to Plant Petunia in Tucson, Arizona (85721)

Location

Tucson, Arizona

ZIP Code

85721

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, December 2, 2025

Transplant Outdoors Tuesday, February 24, 2026

Pro Tip: Start Petunia seeds indoors 10 weeks before your last frost date, then transplant outdoors around Tuesday, February 24, 2026.

🌿 Plant Details

Scientific Name Petunia × hybrida

Days to Maturity 75 days

Mature Height 6-18"

Spread 18"

Type Annual

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.13" deep

Seeds typically germinate in 7-14 days

Ready to Plant Petunia in Tucson?

Get your seeds now so they're ready by Tuesday, December 2, 2025.

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🤝 Good Companions

TomatoBasilMarigold

⚠️ Avoid Planting Near

Fennel

Other Plants for Tucson

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Growing Petunia in Zone 9b

Petunia (Petunia × hybrida) is a popular garden vegetable. In Tucson, Arizona, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, December 2, 2025.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Petunia seedlings outdoors around Tuesday, February 24, 2026, about 2 weeks after your last frost date.