When to Plant Zinnia in Fairbanks, Alaska (99708)

Location

Fairbanks, Alaska

ZIP Code

99708

USDA Zone

Last Frost

Monday, June 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Monday, June 8, 2026

Based on last frost Monday, June 1, 2026 · Zone 2a

Pro tip: Sow Zinnia directly outdoors 1 week after your last frost date — it needs warm soil.

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🌿 Plant Details

Scientific Name Zinnia elegans

Days to Maturity 60 days

Mature Height 12-36"

Spread 12"

Type Annual

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 5-10 days

Ready to Plant Zinnia in Fairbanks?

Get your seeds now so they're ready by Monday, June 8, 2026.

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🤝 Good Companions

TomatoCucumberPepper

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Full Companion Planting Guide for Zinnia

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

🛠️ Supplies You'll Need

🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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Common Zinnia Varieties

Popular cultivars to look for at your local nursery or seed supplier.

California Giant

open-pollinated 70d

Large 4–5 inch double flowers on tall stems; superb for cutting.

Benary's Giant

hybrid 75d

Top-rated cut flower series with strong stems and an enormous color range.

Envy

open-pollinated 75d

Unique lime-green zinnia that pairs beautifully with warm-toned flowers in arrangements.

Zahara

hybrid 60d

Disease-resistant series with smaller, mounded habit — excellent for beds and containers.

🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let flower heads dry completely on the plant — petals should be fully brown and papery.

Processing

Pull dried flower heads apart to find arrow-shaped seeds, dry 1 additional week.

Seed Viability

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

Pro Tip

Zinnias cross easily — for pure color, save from just one variety or bag flowers before they open.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 32 plants of Zinnia. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Zinnia in Fairbanks, Alaska? +

In Fairbanks (Zone 2a), direct sow Zinnia outdoors around Monday, June 8, 2026.

What is the last frost date for Fairbanks, Alaska? +

The average last spring frost date for Fairbanks, Alaska (ZIP 99708) is around Monday, June 1, 2026. This is based on NOAA climate normals for USDA Zone 2a.

How long does Zinnia take to grow? +

Zinnia typically matures in about 60 days from direct sowing. In Fairbanks, that means you can expect harvest around Monday, June 8, 2026 plus 60 days.

Should I start Zinnia indoors or direct sow in Alaska? +

Zinnia does best when direct sown outdoors. In Fairbanks, sow directly around Monday, June 8, 2026.

📚 More Zinnia Planting Guides

🗺️

Zinnia in Alaska

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 2a Zinnia Guide

All cities in your zone · Avg dates

→

Other Plants for Fairbanks

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Growing Zinnia in Zone 2a

Zinnia (Zinnia elegans) is a popular garden vegetable. In Fairbanks, Alaska, which is in USDA Hardiness Zone 2a, you should direct sow seeds around Monday, June 8, 2026.

Your average last frost date is Monday, June 1, 2026. Zinnia grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.