When to Plant Zinnia in Simms, Montana (59477)

Location

Simms, Montana

ZIP Code

59477

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Planting Calendar

Direct Sow Outdoors Tuesday, May 12, 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 Simms?

Get your seeds now so they're ready by Tuesday, May 12, 2026.

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Other Plants for Simms

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Growing Zinnia in Zone 4b

Zinnia (Zinnia elegans) is a popular garden vegetable. In Simms, Montana, which is in USDA Hardiness Zone 4b, you should direct sow seeds around Tuesday, May 12, 2026.

Your average last frost date is Tuesday, May 5, 2026. Zinnia grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.