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

Location

Colorado Springs, Colorado

ZIP Code

80921

USDA Zone

Last Frost

Saturday, April 25, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Saturday, March 28, 2026

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

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

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🌿 Plant Details

Scientific Name Brassica rapa var. nipposinica

Days to Maturity 40 days

Mature Height 8-18"

Spread 8"

☀️ Growing Requirements

☀️

Sun

Partial to Full Sun (4-6 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

6" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 4-7 days

Ready to Plant Mizuna in Colorado Springs?

Get your seeds now so they're ready by Saturday, March 28, 2026.

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🤝 Good Companions

CarrotOnionBeetSpinach

⚠️ Avoid Planting Near

StrawberryTomato

🤝

Full Companion Planting Guide for Mizuna

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

🛠️ Supplies You'll Need

🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let plants bolt fully. Harvest seed pods when tan and dry before they shatter.

Processing

Thresh dried stalks to release seeds, winnow to separate from chaff.

Seed Viability

Up to 4 years when stored cool, dark, and dry.

Pro Tip

Mizuna is a Brassica rapa and will cross with other mustard-family plants — isolate by 300 feet for purity.

🪴

Raised Bed Planting Guides

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

Frequently Asked Questions

When should I plant Mizuna in Colorado Springs, Colorado? +

In Colorado Springs (Zone 5b), direct sow Mizuna outdoors around Saturday, March 28, 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 Mizuna take to grow? +

Mizuna typically matures in about 40 days from direct sowing. In Colorado Springs, that means you can expect harvest around Saturday, March 28, 2026 plus 40 days.

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

Mizuna does best when direct sown outdoors. In Colorado Springs, sow directly around Saturday, March 28, 2026.

📚 More Mizuna Planting Guides

🗺️

Mizuna in Colorado

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 5b Mizuna Guide

All cities in your zone · Avg dates

→

Other Plants for Colorado Springs

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Growing Mizuna in Zone 5b

Mizuna (Brassica rapa var. nipposinica) is a popular garden vegetable. In Colorado Springs, Colorado, which is in USDA Hardiness Zone 5b, you should direct sow seeds around Saturday, March 28, 2026.

Your average last frost date is Saturday, April 25, 2026. Mizuna grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.