When to Plant Brussels Sprout in Tucson, Arizona (85708)

Location

Tucson, Arizona

ZIP Code

85708

USDA Zone

Last Frost

Tuesday, February 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Tuesday, November 18, 2025

Transplant Outdoors

Tuesday, February 10, 2026

Based on last frost Tuesday, February 10, 2026 · Zone 9b

Pro tip: Start Brussels Sprout seeds indoors 12 weeks before your last frost date, then transplant outdoors around Tuesday, February 10, 2026.

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🌿 Plant Details

Scientific Name Brassica oleracea var. gemmifera

Days to Maturity 84 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Brussels Sprout in Tucson?

Get your seeds now so they're ready by Tuesday, November 18, 2025.

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🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🔴 Difficult

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow some sprouts to open into flowers. Harvest seed pods in summer/fall when dry.

Processing

Thresh dry pods, winnow to separate seeds from chaff.

Seed Viability

Up to 5 years when stored cool, dark, and dry.

Pro Tip

B. oleracea — crosses freely with other cole crops. Biennial nature makes isolation especially challenging.

Frequently Asked Questions

When should I plant Brussels Sprout in Tucson, Arizona? +

In Tucson (Zone 9b), start Brussels Sprout seeds indoors around Tuesday, November 18, 2025 and transplant outdoors around Tuesday, February 10, 2026.

What is the last frost date for Tucson, Arizona? +

The average last spring frost date for Tucson, Arizona (ZIP 85708) is around Tuesday, February 10, 2026. This is based on NOAA climate normals for USDA Zone 9b.

How long does Brussels Sprout take to grow? +

Brussels Sprout typically matures in about 84 days from transplanting. In Tucson, that means you can expect harvest around Tuesday, February 10, 2026 plus 84 days.

Should I start Brussels Sprout indoors or direct sow in Arizona? +

Brussels Sprout should be started indoors 12 weeks before your last frost date. In Tucson, that means starting around Tuesday, November 18, 2025.

📚 More Brussels Sprout Planting Guides

🗺️

Brussels Sprout in Arizona

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9b Brussels Sprout Guide

All cities in your zone · Avg dates

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Growing Brussels Sprout in Zone 9b

Brussels Sprout (Brassica oleracea var. gemmifera) is a popular garden vegetable. In Tucson, Arizona, which is in USDA Hardiness Zone 9b, you should start seeds indoors around Tuesday, November 18, 2025.

Your average last frost date is Tuesday, February 10, 2026. Plan to transplant your Brussels Sprout seedlings outdoors around Tuesday, February 10, 2026, about 0 weeks after your last frost date.