When to Plant Asparagus in Onaga, Kansas (66521)

Location

Onaga, Kansas

ZIP Code

66521

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Monday, February 23, 2026

Transplant Outdoors

Monday, May 4, 2026

Based on last frost Monday, April 20, 2026 · Zone 6a

Pro tip: Start Asparagus seeds indoors 8 weeks before your last frost date, then transplant outdoors around Monday, May 4, 2026.

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🌿 Plant Details

Scientific Name Asparagus officinalis

Days to Maturity 730 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-21 days

Ready to Plant Asparagus in Onaga?

Get your seeds now so they're ready by Monday, February 23, 2026.

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🤝 Good Companions

TomatoAsterDillCorianderParsleyBasilComfreyMarigold

⚠️ Avoid Planting Near

OnionGarlicPotato

🤝

Full Companion Planting Guide for Asparagus

See which plants help Asparagus 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

Allow red berries to ripen fully on female plants in late summer/fall.

Processing

Mash berries to release seeds, rinse, dry flat for 2 weeks.

Seed Viability

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

Pro Tip

Asparagus is dioecious — only female plants produce berries. Male plants produce more spears, so save seed selectively.

Frequently Asked Questions

When should I plant Asparagus in Onaga, Kansas? +

In Onaga (Zone 6a), start Asparagus seeds indoors around Monday, February 23, 2026 and transplant outdoors around Monday, May 4, 2026.

What is the last frost date for Onaga, Kansas? +

The average last spring frost date for Onaga, Kansas (ZIP 66521) is around Monday, April 20, 2026. This is based on NOAA climate normals for USDA Zone 6a.

How long does Asparagus take to grow? +

Asparagus typically matures in about 730 days from transplanting. In Onaga, that means you can expect harvest around Monday, May 4, 2026 plus 730 days.

Should I start Asparagus indoors or direct sow in Kansas? +

Asparagus should be started indoors 8 weeks before your last frost date. In Onaga, that means starting around Monday, February 23, 2026.

📚 More Asparagus Planting Guides

🗺️

Asparagus in Kansas

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 6a Asparagus Guide

All cities in your zone · Avg dates

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Other Plants for Onaga

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Growing Asparagus in Zone 6a

Asparagus (Asparagus officinalis) is a popular garden vegetable. In Onaga, Kansas, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, February 23, 2026.

Your average last frost date is Monday, April 20, 2026. Plan to transplant your Asparagus seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.