When to Plant Columbine in Denton, Montana (59430)

Location

Denton, Montana

ZIP Code

59430

USDA Zone

Last Frost

Tuesday, May 5, 2026

📅 Planting Calendar

Start Seeds Indoors Tuesday, March 10, 2026

Transplant Outdoors Tuesday, May 19, 2026

Pro Tip: Start Columbine seeds indoors 8 weeks before your last frost date, then transplant outdoors around Tuesday, May 19, 2026.

🌿 Plant Details

Scientific Name Aquilegia vulgaris

Days to Maturity 365 days

Mature Height 18-36"

Spread 18"

☀️ Growing Requirements

☀️

Sun

Partial Shade to Full Sun

💧

Water

Moderate (1 inch/week)

↔️

Spacing

12" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 21-30 days

Ready to Plant Columbine in Denton?

Get your seeds now so they're ready by Tuesday, March 10, 2026.

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Growing Columbine in Zone 4b

Columbine (Aquilegia vulgaris) is a popular garden vegetable. In Denton, Montana, which is in USDA Hardiness Zone 4b, you should start seeds indoors around Tuesday, March 10, 2026.

Your average last frost date is Tuesday, May 5, 2026. Plan to transplant your Columbine seedlings outdoors around Tuesday, May 19, 2026, about 2 weeks after your last frost date.