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When to Plant Sweet Pea in Mount Wilson, California (91023)

Location

Mount Wilson, California

ZIP Code

91023

USDA Zone

9a

Last Frost

Friday, February 20, 2026

📅 Planting Calendar

Direct Sow Outdoors Friday, January 23, 2026

Pro Tip: Sow Sweet Pea directly outdoors 4 weeks before your last frost date.

🌿 Plant Details

Scientific Name Lathyrus odoratus
Days to Maturity 65 days
Mature Height 48-72"
Spread 8"

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

6" apart

🌱

Planting Depth

1" deep

Seeds typically germinate in 10-21 days

Ready to Plant Sweet Pea in Mount Wilson?

Get your seeds now so they're ready by Friday, January 23, 2026.

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🤝 Good Companions

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⚠️ Avoid Planting Near

OnionGarlic

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Growing Sweet Pea in Zone 9a

Sweet Pea (Lathyrus odoratus) is a popular garden vegetable. In Mount Wilson, California, which is in USDA Hardiness Zone 9a, you should direct sow seeds around Friday, January 23, 2026.

Your average last frost date is Friday, February 20, 2026. Sweet Pea grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.