When to Plant Serrano Pepper in Washington, District of Columbia (20421)

Location

Washington, District of Columbia

ZIP Code

20421

USDA Zone

Last Frost

Friday, March 20, 2026

📅 Planting Calendar

Start Seeds Indoors Friday, January 9, 2026

Transplant Outdoors Friday, April 3, 2026

Pro Tip: Start Serrano Pepper seeds indoors 10 weeks before your last frost date, then transplant outdoors around Friday, April 3, 2026.

🌿 Plant Details

Scientific Name Capsicum annuum

Days to Maturity 80 days

Mature Height 24-36"

Spread 18"

Type Bush

Fruit Size Small (1-2 inches)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-14 days

Ready to Plant Serrano Pepper in Washington?

Get your seeds now so they're ready by Friday, January 9, 2026.

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🤝 Good Companions

BasilCarrotTomato

⚠️ Avoid Planting Near

Fennel

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Growing Serrano Pepper in Zone 8a

Serrano Pepper (Capsicum annuum) is a popular garden vegetable. In Washington, District of Columbia, which is in USDA Hardiness Zone 8a, you should start seeds indoors around Friday, January 9, 2026.

Your average last frost date is Friday, March 20, 2026. Plan to transplant your Serrano Pepper seedlings outdoors around Friday, April 3, 2026, about 2 weeks after your last frost date.