When to Plant Echinacea (Coneflower) in Rocklake, North Dakota (58365)

Location

Rocklake, North Dakota

ZIP Code

58365

USDA Zone

Last Frost

Wednesday, May 20, 2026

📅 Planting Calendar

Start Seeds Indoors Wednesday, March 11, 2026

Transplant Outdoors Wednesday, June 3, 2026

Pro Tip: Start Echinacea (Coneflower) seeds indoors 10 weeks before your last frost date, then transplant outdoors around Wednesday, June 3, 2026.

🌿 Plant Details

Scientific Name Echinacea purpurea

Days to Maturity 365 days

Mature Height 24-48"

Spread 24"

Type Perennial

☀️ Growing Requirements

☀️

Sun

Full Sun to Partial Shade

💧

Water

Low (drought tolerant once established)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 14-21 days

Ready to Plant Echinacea (Coneflower) in Rocklake?

Get your seeds now so they're ready by Wednesday, March 11, 2026.

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Growing Echinacea (Coneflower) in Zone 3b

Echinacea (Coneflower) (Echinacea purpurea) is a popular garden vegetable. In Rocklake, North Dakota, which is in USDA Hardiness Zone 3b, you should start seeds indoors around Wednesday, March 11, 2026.

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