When to Plant Celery in Hayden, Colorado (81639)

Location

Hayden, Colorado

ZIP Code

81639

USDA Zone

Last Frost

Sunday, May 10, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Sunday, March 1, 2026

Transplant Outdoors

Sunday, May 24, 2026

Based on last frost Sunday, May 10, 2026 · Zone 5a

Pro tip: Start Celery seeds indoors 10 weeks before your last frost date, then transplant outdoors around Sunday, May 24, 2026.

🌿 Plant Details

Scientific Name Apium graveolens

Days to Maturity 130 days

☀️ Growing Requirements

☀️

Sun

Full Sun

💧

Water

Regular

Seeds typically germinate in 8-28 days

Ready to Plant Celery in Hayden?

Get your seeds now so they're ready by Sunday, March 1, 2026.

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🤝 Good Companions

CosmosDaisySnapDragon

⚠️ Avoid Planting Near

CornAster

See the full companion planting guide for Celery →

🛠️ 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

🔴 Difficult

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Celery is biennial — it seeds in year 2. Harvest umbels just before seeds shatter in summer.

Processing

Cut seed heads into bags, dry 2 weeks, thresh to release seeds.

Seed Viability

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

Pro Tip

In cold climates, dig celery in fall, store roots in a root cellar, and replant in spring for year-2 flowering.

Frequently Asked Questions

When should I plant Celery in Hayden, Colorado? +

In Hayden (Zone 5a), start Celery seeds indoors around Sunday, March 1, 2026 and transplant outdoors around Sunday, May 24, 2026.

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

The average last spring frost date for Hayden, Colorado (ZIP 81639) is around Sunday, May 10, 2026. This is based on NOAA climate normals for USDA Zone 5a.

How long does Celery take to grow? +

Celery typically matures in about 130 days from transplanting. In Hayden, that means you can expect harvest around Sunday, May 24, 2026 plus 130 days.

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

Celery should be started indoors 10 weeks before your last frost date. In Hayden, that means starting around Sunday, March 1, 2026.

📚 More Celery Planting Guides

🗺️

Celery in Colorado

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 5a Celery Guide

All cities in your zone · Avg dates

→

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Growing Celery in Zone 5a

Celery (Apium graveolens) is a popular garden vegetable. In Hayden, Colorado, which is in USDA Hardiness Zone 5a, you should start seeds indoors around Sunday, March 1, 2026.

Your average last frost date is Sunday, May 10, 2026. Plan to transplant your Celery seedlings outdoors around Sunday, May 24, 2026, about 2 weeks after your last frost date.