When to Plant Brussels Sprout in Agate, North Dakota (58310)

Location

Agate, North Dakota

ZIP Code

58310

USDA Zone

Last Frost

Wednesday, May 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Wednesday, February 25, 2026

Transplant Outdoors

Wednesday, May 20, 2026

Based on last frost Wednesday, May 20, 2026 · Zone 3b

Pro tip: Start Brussels Sprout seeds indoors 12 weeks before your last frost date, then transplant outdoors around Wednesday, May 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 Agate?

Get your seeds now so they're ready by Wednesday, February 25, 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 Agate, North Dakota? +

In Agate (Zone 3b), start Brussels Sprout seeds indoors around Wednesday, February 25, 2026 and transplant outdoors around Wednesday, May 20, 2026.

What is the last frost date for Agate, North Dakota? +

The average last spring frost date for Agate, North Dakota (ZIP 58310) is around Wednesday, May 20, 2026. This is based on NOAA climate normals for USDA Zone 3b.

How long does Brussels Sprout take to grow? +

Brussels Sprout typically matures in about 84 days from transplanting. In Agate, that means you can expect harvest around Wednesday, May 20, 2026 plus 84 days.

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

Brussels Sprout should be started indoors 12 weeks before your last frost date. In Agate, that means starting around Wednesday, February 25, 2026.

📚 More Brussels Sprout Planting Guides

🗺️

Brussels Sprout in North Dakota

Zone-by-zone breakdown · Full state guide

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Zone 3b Brussels Sprout Guide

All cities in your zone · Avg dates

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Growing Brussels Sprout in Zone 3b

Brussels Sprout (Brassica oleracea var. gemmifera) is a popular garden vegetable. In Agate, North Dakota, which is in USDA Hardiness Zone 3b, you should start seeds indoors around Wednesday, February 25, 2026.

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