When to Plant Plum Tree in Mount Wilson, California (91023)

Location

Mount Wilson, California

ZIP Code

91023

USDA Zone

Last Frost

Friday, February 20, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Friday, January 9, 2026

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

Pro tip: Sow Plum Tree directly outdoors 6 weeks before your last frost date.

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🌿 Plant Details

Scientific Name Prunus domestica

Days to Maturity 1460 days

Mature Height 60-180"

Spread 150"

Type Deciduous Tree

Fruit Size Medium (1-2 inches)

☀️ Growing Requirements

☀️

Sun

Full Sun (6-8 hours)

💧

Water

Moderate (1 inch/week)

↔️

Spacing

180" apart

Ready to Plant Plum Tree in Mount Wilson?

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

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🤝 Good Companions

ComfreyChiveNasturtium

⚠️ Avoid Planting Near

WalnutFennel

🤝

Full Companion Planting Guide for Plum Tree

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

🛠️ Supplies You'll Need

🌿 Fruit Tree Fertilizer 🕸️ Garden Netting 🚿 Watering Can

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🌾 Seed Saving Guide

🪴 Vegetative propagation

Propagate vegetatively, not by seed

Plum seeds do not grow true. Propagate by grafting for reliable fruit quality.

Remove flesh from pit, crack the outer shell, and cold-stratify for 3–4 months to germinate.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 0 plants of Plum Tree. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Plum Tree in Mount Wilson, California? +

In Mount Wilson (Zone 9a), direct sow Plum Tree outdoors around Friday, January 9, 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 Plum Tree take to grow? +

Plum Tree typically matures in about 1460 days from direct sowing. In Mount Wilson, that means you can expect harvest around Friday, January 9, 2026 plus 1460 days.

Should I start Plum Tree indoors or direct sow in California? +

Plum Tree does best when direct sown outdoors. In Mount Wilson, sow directly around Friday, January 9, 2026.

📚 More Plum Tree Planting Guides

🗺️

Plum Tree in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 9a Plum Tree Guide

All cities in your zone · Avg dates

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Other Plants for Mount Wilson

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Growing Plum Tree in Zone 9a

Plum Tree (Prunus domestica) is a popular garden vegetable. In Mount Wilson, California, which is in USDA Hardiness Zone 9a, you should direct sow seeds around Friday, January 9, 2026.

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