When to Plant Zinnia in Biwabik, Minnesota (55708)

Location

Biwabik, Minnesota

ZIP Code

55708

USDA Zone

Last Frost

Wednesday, May 20, 2026

📅 Planting Calendar

Direct Sow Outdoors Wednesday, May 27, 2026

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

🌿 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 Biwabik?

Get your seeds now so they're ready by Wednesday, May 27, 2026.

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Growing Zinnia in Zone 3b

Zinnia (Zinnia elegans) is a popular garden vegetable. In Biwabik, Minnesota, which is in USDA Hardiness Zone 3b, you should direct sow seeds around Wednesday, May 27, 2026.

Your average last frost date is Wednesday, May 20, 2026. Zinnia grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.