When to Plant Rhubarb in Biwabik, Minnesota (55708)

Location

Biwabik, Minnesota

ZIP Code

55708

USDA Zone

Last Frost

Wednesday, May 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Wednesday, March 25, 2026

Transplant Outdoors

Wednesday, June 3, 2026

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

Pro tip: Start Rhubarb seeds indoors 8 weeks before your last frost date, then transplant outdoors around Wednesday, June 3, 2026.

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🌿 Plant Details

Scientific Name Rheum rhabarbarum

Days to Maturity 365 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-21 days

Ready to Plant Rhubarb in Biwabik?

Get your seeds now so they're ready by Wednesday, March 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

🟡 Moderate

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Allow flower stalks to develop in early summer. Harvest when seeds in the large seed clusters turn brown.

Processing

Cut dried seed stalks, thresh to release seeds, winnow lightly.

Seed Viability

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

Pro Tip

Rhubarb seeds don't grow true to variety. For identical plants, propagate by crown division in early spring.

Frequently Asked Questions

When should I plant Rhubarb in Biwabik, Minnesota? +

In Biwabik (Zone 3b), start Rhubarb seeds indoors around Wednesday, March 25, 2026 and transplant outdoors around Wednesday, June 3, 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 Rhubarb take to grow? +

Rhubarb typically matures in about 365 days from transplanting. In Biwabik, that means you can expect harvest around Wednesday, June 3, 2026 plus 365 days.

Should I start Rhubarb indoors or direct sow in Minnesota? +

Rhubarb should be started indoors 8 weeks before your last frost date. In Biwabik, that means starting around Wednesday, March 25, 2026.

📚 More Rhubarb Planting Guides

🗺️

Rhubarb in Minnesota

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 3b Rhubarb Guide

All cities in your zone · Avg dates

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Growing Rhubarb in Zone 3b

Rhubarb (Rheum rhabarbarum) is a popular garden vegetable. In Biwabik, Minnesota, which is in USDA Hardiness Zone 3b, you should start seeds indoors around Wednesday, March 25, 2026.

Your average last frost date is Wednesday, May 20, 2026. Plan to transplant your Rhubarb seedlings outdoors around Wednesday, June 3, 2026, about 2 weeks after your last frost date.