When to Plant Oregano in Mount Wilson, California (91023)

Location

Mount Wilson, California

ZIP Code

91023

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Friday, December 26, 2025

Transplant Outdoors

Friday, March 6, 2026

Based on last frost Friday, February 20, 2026 · Zone 9a

Pro tip: Start Oregano seeds indoors 8 weeks before your last frost date, then transplant outdoors around Friday, March 6, 2026.

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🌿 Plant Details

Scientific Name Origanum vulgare

Days to Maturity 80 days

Mature Height 12-24"

Spread 18"

Type Spreading

Fruit Size N/A

☀️ Growing Requirements

☀️

Sun

Full Sun (6+ hours)

💧

Water

Low to Moderate

↔️

Spacing

12" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 7-14 days

Ready to Plant Oregano in Mount Wilson?

Get your seeds now so they're ready by Friday, December 26, 2025.

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🤝 Good Companions

PepperTomatoBasil

🤝

Full Companion Planting Guide for Oregano

See which plants help Oregano thrive, which to keep away, and raised bed layout tips →

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🪵 Raised Garden Bed 🌍 Vegetable Garden Soil 🛠️ Hand Trowel Set 🚿 Watering Can

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🌾 Seed Saving Guide

🟢 Easy

✅ Open-pollinated — seeds grow true to parent

When to Harvest Seed

Let flower clusters dry fully on the plant — tiny seeds form in dried calyxes.

Processing

Strip dried clusters, rub between fingers over a bowl, winnow lightly to remove chaff.

Seed Viability

Up to 3 years when stored cool, dark, and dry.

Pro Tip

Greek oregano from seed may vary in flavor intensity. Propagate by cuttings for culinary consistency.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 32 plants of Oregano. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Oregano in Mount Wilson, California? +

In Mount Wilson (Zone 9a), start Oregano seeds indoors around Friday, December 26, 2025 and transplant outdoors around Friday, March 6, 2026.

What is the last frost date for Mount Wilson, California? +

The average last spring frost date for Mount Wilson, California (ZIP 91023) is around Friday, February 20, 2026. This is based on NOAA climate normals for USDA Zone 9a.

How long does Oregano take to grow? +

Oregano typically matures in about 80 days from transplanting. In Mount Wilson, that means you can expect harvest around Friday, March 6, 2026 plus 80 days.

Should I start Oregano indoors or direct sow in California? +

Oregano should be started indoors 8 weeks before your last frost date. In Mount Wilson, that means starting around Friday, December 26, 2025.

📚 More Oregano Planting Guides

🗺️

Oregano in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9a Oregano Guide

All cities in your zone · Avg dates

→

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Growing Oregano in Zone 9a

Oregano (Origanum vulgare) is a popular garden vegetable. In Mount Wilson, California, which is in USDA Hardiness Zone 9a, you should start seeds indoors around Friday, December 26, 2025.

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