When to Plant Rhubarb in Colorado Springs, Colorado (80921)

Location

Colorado Springs, Colorado

ZIP Code

80921

USDA Zone

Last Frost

Saturday, April 25, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Saturday, February 28, 2026

Transplant Outdoors

Saturday, May 9, 2026

Based on last frost Saturday, April 25, 2026 · Zone 5b

Pro tip: Start Rhubarb seeds indoors 8 weeks before your last frost date, then transplant outdoors around Saturday, May 9, 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 Colorado Springs?

Get your seeds now so they're ready by Saturday, February 28, 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 Colorado Springs, Colorado? +

In Colorado Springs (Zone 5b), start Rhubarb seeds indoors around Saturday, February 28, 2026 and transplant outdoors around Saturday, May 9, 2026.

What is the last frost date for Colorado Springs, Colorado? +

The average last spring frost date for Colorado Springs, Colorado (ZIP 80921) is around Saturday, April 25, 2026. This is based on NOAA climate normals for USDA Zone 5b.

How long does Rhubarb take to grow? +

Rhubarb typically matures in about 365 days from transplanting. In Colorado Springs, that means you can expect harvest around Saturday, May 9, 2026 plus 365 days.

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

Rhubarb should be started indoors 8 weeks before your last frost date. In Colorado Springs, that means starting around Saturday, February 28, 2026.

📚 More Rhubarb Planting Guides

🗺️

Rhubarb in Colorado

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 5b Rhubarb Guide

All cities in your zone · Avg dates

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Growing Rhubarb in Zone 5b

Rhubarb (Rheum rhabarbarum) is a popular garden vegetable. In Colorado Springs, Colorado, which is in USDA Hardiness Zone 5b, you should start seeds indoors around Saturday, February 28, 2026.

Your average last frost date is Saturday, April 25, 2026. Plan to transplant your Rhubarb seedlings outdoors around Saturday, May 9, 2026, about 2 weeks after your last frost date.