When to Plant Brussels Sprout in Bay City, Michigan (48708)

Location

Bay City, Michigan

ZIP Code

48708

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Monday, January 26, 2026

Transplant Outdoors

Monday, April 20, 2026

Based on last frost Monday, April 20, 2026 · Zone 6a

Pro tip: Start Brussels Sprout seeds indoors 12 weeks before your last frost date, then transplant outdoors around Monday, April 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 Bay City?

Get your seeds now so they're ready by Monday, January 26, 2026.

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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 Bay City, Michigan? +

In Bay City (Zone 6a), start Brussels Sprout seeds indoors around Monday, January 26, 2026 and transplant outdoors around Monday, April 20, 2026.

What is the last frost date for Bay City, Michigan? +

The average last spring frost date for Bay City, Michigan (ZIP 48708) is around Monday, April 20, 2026. This is based on NOAA climate normals for USDA Zone 6a.

How long does Brussels Sprout take to grow? +

Brussels Sprout typically matures in about 84 days from transplanting. In Bay City, that means you can expect harvest around Monday, April 20, 2026 plus 84 days.

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

Brussels Sprout should be started indoors 12 weeks before your last frost date. In Bay City, that means starting around Monday, January 26, 2026.

📚 More Brussels Sprout Planting Guides

🗺️

Brussels Sprout in Michigan

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6a Brussels Sprout Guide

All cities in your zone · Avg dates

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Growing Brussels Sprout in Zone 6a

Brussels Sprout (Brassica oleracea var. gemmifera) is a popular garden vegetable. In Bay City, Michigan, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, January 26, 2026.

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