When to Plant Impatiens in Seattle, Washington (98144)

Location

Seattle, Washington

ZIP Code

98144

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, December 12, 2025

Transplant Outdoors Friday, March 6, 2026

Pro Tip: Start Impatiens seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, March 6, 2026.

🌿 Plant Details

Scientific Name Impatiens walleriana

Days to Maturity 60 days

Mature Height 8-18"

Spread 12"

☀️ Growing Requirements

☀️

Sun

Partial to Full Shade (2-4 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

8" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 14-21 days

Ready to Plant Impatiens in Seattle?

Get your seeds now so they're ready by Friday, December 12, 2025.

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Growing Impatiens in Zone 9a

Impatiens (Impatiens walleriana) is a popular garden vegetable. In Seattle, Washington, which is in USDA Hardiness Zone 9a, you should start seeds indoors around Friday, December 12, 2025.

Your average last frost date is Friday, February 20, 2026. Plan to transplant your Impatiens seedlings outdoors around Friday, March 6, 2026, about 2 weeks after your last frost date.