When to Plant Leek in Baldwin, North Dakota (58521)

Location

Baldwin, North Dakota

ZIP Code

58521

USDA Zone

Last Frost

Friday, May 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, March 6, 2026

Transplant Outdoors

Friday, May 29, 2026

Based on last frost Friday, May 15, 2026 · Zone 4a

Pro tip: Start Leek seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, May 29, 2026.

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🌿 Plant Details

Scientific Name Allium ampeloprasum

Days to Maturity 120 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 1-7 days

Ready to Plant Leek in Baldwin?

Get your seeds now so they're ready by Friday, March 6, 2026.

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🤝 Good Companions

CeleryAppleCarrot

⚠️ Avoid Planting Near

Swiss Chard

🤝

Full Companion Planting Guide for Leek

See which plants help Leek thrive, which to keep away, and raised bed layout tips →

🛠️ 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

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Biennial — allow flowering in year 2. Harvest seed heads when seeds are black and ripe.

Processing

Cut seed heads into bags when most seeds are black, dry 1 week, thresh gently.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Leeks cross-pollinate with onions via insects. Isolate by at least a mile for truly pure seed.

Frequently Asked Questions

When should I plant Leek in Baldwin, North Dakota? +

In Baldwin (Zone 4a), start Leek seeds indoors around Friday, March 6, 2026 and transplant outdoors around Friday, May 29, 2026.

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

The average last spring frost date for Baldwin, North Dakota (ZIP 58521) is around Friday, May 15, 2026. This is based on NOAA climate normals for USDA Zone 4a.

How long does Leek take to grow? +

Leek typically matures in about 120 days from transplanting. In Baldwin, that means you can expect harvest around Friday, May 29, 2026 plus 120 days.

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

Leek should be started indoors 10 weeks before your last frost date. In Baldwin, that means starting around Friday, March 6, 2026.

📚 More Leek Planting Guides

🗺️

Leek in North Dakota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 4a Leek Guide

All cities in your zone · Avg dates

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Other Plants for Baldwin

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Growing Leek in Zone 4a

Leek (Allium ampeloprasum) is a popular garden vegetable. In Baldwin, North Dakota, which is in USDA Hardiness Zone 4a, you should start seeds indoors around Friday, March 6, 2026.

Your average last frost date is Friday, May 15, 2026. Plan to transplant your Leek seedlings outdoors around Friday, May 29, 2026, about 2 weeks after your last frost date.