When to Plant Spinach in Riverside, California (92521)

Location

Riverside, California

ZIP Code

92521

USDA Zone

10a

Last Frost

Sunday, January 25, 2026

📅 Planting Calendar

Direct Sow Outdoors Sunday, December 14, 2025

Pro Tip: Sow Spinach directly outdoors 6 weeks before your last frost date.

🌿 Plant Details

Scientific Name Spinacia oleracea

Days to Maturity 40 days

Mature Height 6-12"

Spread 6"

Type Leaf

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Partial Shade to Full Sun

💧

Water

Regular (keep moist)

↔️

Spacing

6" apart

🌱

Planting Depth

0.5" deep

Seeds typically germinate in 7-14 days

Ready to Plant Spinach in Riverside?

Get your seeds now so they're ready by Sunday, December 14, 2025.

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🤝 Good Companions

StrawberryPeaBeanBrassicas

Other Plants for Riverside

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Growing Spinach in Zone 10a

Spinach (Spinacia oleracea) is a popular garden vegetable. In Riverside, California, which is in USDA Hardiness Zone 10a, you should direct sow seeds around Sunday, December 14, 2025.

Your average last frost date is Sunday, January 25, 2026. Spinach grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.