When to Plant Brussels Sprout in Austin, Texas (78708)

Location

Austin, Texas

ZIP Code

78708

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, November 28, 2025

Transplant Outdoors

Friday, February 20, 2026

Based on last frost Friday, February 20, 2026 · Zone 9a

Pro tip: Start Brussels Sprout seeds indoors 12 weeks before your last frost date, then transplant outdoors around Friday, February 20, 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 Austin?

Get your seeds now so they're ready by Friday, November 28, 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 Austin, Texas? +

In Austin (Zone 9a), start Brussels Sprout seeds indoors around Friday, November 28, 2025 and transplant outdoors around Friday, February 20, 2026.

What is the last frost date for Austin, Texas? +

The average last spring frost date for Austin, Texas (ZIP 78708) is around Friday, February 20, 2026. This is based on NOAA climate normals for USDA Zone 9a.

How long does Brussels Sprout take to grow? +

Brussels Sprout typically matures in about 84 days from transplanting. In Austin, that means you can expect harvest around Friday, February 20, 2026 plus 84 days.

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

Brussels Sprout should be started indoors 12 weeks before your last frost date. In Austin, that means starting around Friday, November 28, 2025.

📚 More Brussels Sprout Planting Guides

🗺️

Brussels Sprout in Texas

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9a Brussels Sprout Guide

All cities in your zone · Avg dates

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Growing Brussels Sprout in Zone 9a

Brussels Sprout (Brassica oleracea var. gemmifera) is a popular garden vegetable. In Austin, Texas, which is in USDA Hardiness Zone 9a, you should start seeds indoors around Friday, November 28, 2025.

Your average last frost date is Friday, February 20, 2026. Plan to transplant your Brussels Sprout seedlings outdoors around Friday, February 20, 2026, about 0 weeks after your last frost date.