When to Plant Sweet Pea in Biwabik, Minnesota (55708)

Location

Biwabik, Minnesota

ZIP Code

55708

USDA Zone

Last Frost

Wednesday, May 20, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Wednesday, April 22, 2026

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

Pro tip: Sow Sweet Pea directly outdoors 4 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Lathyrus odoratus

Days to Maturity 65 days

Mature Height 48-72"

Spread 8"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

6" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 10-21 days

Ready to Plant Sweet Pea in Biwabik?

Get your seeds now so they're ready by Wednesday, April 22, 2026.

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🤝 Good Companions

CarrotRadishSpinach

⚠️ Avoid Planting Near

OnionGarlic

🤝

Full Companion Planting Guide for Sweet Pea

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

🛠️ Supplies You'll Need

🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow seed pods to dry and turn tan on the vine. Pick before they pop open and throw seeds.

Processing

Shell dried pods, spread seeds to dry 1 week before storing.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Sweet peas are self-pollinating before flowers open — excellent for keeping varieties pure.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 4 per sq ft of Sweet Pea. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Sweet Pea in Biwabik, Minnesota? +

In Biwabik (Zone 3b), direct sow Sweet Pea outdoors around Wednesday, April 22, 2026.

What is the last frost date for Biwabik, Minnesota? +

The average last spring frost date for Biwabik, Minnesota (ZIP 55708) is around Wednesday, May 20, 2026. This is based on NOAA climate normals for USDA Zone 3b.

How long does Sweet Pea take to grow? +

Sweet Pea typically matures in about 65 days from direct sowing. In Biwabik, that means you can expect harvest around Wednesday, April 22, 2026 plus 65 days.

Should I start Sweet Pea indoors or direct sow in Minnesota? +

Sweet Pea does best when direct sown outdoors. In Biwabik, sow directly around Wednesday, April 22, 2026.

📚 More Sweet Pea Planting Guides

🗺️

Sweet Pea in Minnesota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 3b Sweet Pea Guide

All cities in your zone · Avg dates

→

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Growing Sweet Pea in Zone 3b

Sweet Pea (Lathyrus odoratus) is a popular garden vegetable. In Biwabik, Minnesota, which is in USDA Hardiness Zone 3b, you should direct sow seeds around Wednesday, April 22, 2026.

Your average last frost date is Wednesday, May 20, 2026. Sweet Pea grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.