When to Plant Banana Pepper in Boulder, Colorado (80310)

Location

Boulder, Colorado

ZIP Code

80310

USDA Zone

Last Frost

Monday, April 20, 2026

📅 Planting Calendar

Start Seeds Indoors Monday, February 9, 2026

Transplant Outdoors Monday, May 4, 2026

Pro Tip: Start Banana Pepper seeds indoors 10 weeks before your last frost date, then transplant outdoors around Monday, May 4, 2026.

🌿 Plant Details

Scientific Name Capsicum annuum

Days to Maturity 70 days

Mature Height 18-24"

Spread 18"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

18" apart

🌱

Planting Depth

0.25" deep

Seeds typically germinate in 7-14 days

Ready to Plant Banana Pepper in Boulder?

Get your seeds now so they're ready by Monday, February 9, 2026.

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🤝 Good Companions

BasilCarrotTomatoMarigold

⚠️ Avoid Planting Near

FennelBrassicas

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Growing Banana Pepper in Zone 6a

Banana Pepper (Capsicum annuum) is a popular garden vegetable. In Boulder, Colorado, which is in USDA Hardiness Zone 6a, you should start seeds indoors around Monday, February 9, 2026.

Your average last frost date is Monday, April 20, 2026. Plan to transplant your Banana Pepper seedlings outdoors around Monday, May 4, 2026, about 2 weeks after your last frost date.