When to Plant Hollyhock in Isabella, Minnesota (55607)

Location

Isabella, Minnesota

ZIP Code

55607

USDA Zone

Last Frost

Wednesday, May 20, 2026

📅 Planting Calendar

Start Seeds Indoors Wednesday, April 8, 2026

Transplant Outdoors Wednesday, June 3, 2026

Pro Tip: Start Hollyhock seeds indoors 6 weeks before your last frost date, then transplant outdoors around Wednesday, June 3, 2026.

🌿 Plant Details

Scientific Name Alcea rosea

Days to Maturity 365 days

Mature Height 48-96"

Spread 24"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 10-14 days

Ready to Plant Hollyhock in Isabella?

Get your seeds now so they're ready by Wednesday, April 8, 2026.

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Growing Hollyhock in Zone 3b

Hollyhock (Alcea rosea) is a popular garden vegetable. In Isabella, Minnesota, which is in USDA Hardiness Zone 3b, you should start seeds indoors around Wednesday, April 8, 2026.

Your average last frost date is Wednesday, May 20, 2026. Plan to transplant your Hollyhock seedlings outdoors around Wednesday, June 3, 2026, about 2 weeks after your last frost date.