When to Plant Plum Tree in Honolulu, Hawaii (96821)

Location

Honolulu, Hawaii

ZIP Code

96821

USDA Zone

12b

Last Frost

Thursday, January 1, 2026

📅 Your 2026 Planting Dates

Direct Sow Outdoors

Thursday, November 20, 2025

Based on last frost Thursday, January 1, 2026 · Zone 12b

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

🌿 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 Honolulu?

Get your seeds now so they're ready by Thursday, November 20, 2025.

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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 Honolulu, Hawaii? +

In Honolulu (Zone 12b), direct sow Plum Tree outdoors around Thursday, November 20, 2025.

What is the last frost date for Honolulu, Hawaii? +

The average last spring frost date for Honolulu, Hawaii (ZIP 96821) is around Thursday, January 1, 2026. This is based on NOAA climate normals for USDA Zone 12b.

How long does Plum Tree take to grow? +

Plum Tree typically matures in about 1460 days from direct sowing. In Honolulu, that means you can expect harvest around Thursday, November 20, 2025 plus 1460 days.

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

Plum Tree does best when direct sown outdoors. In Honolulu, sow directly around Thursday, November 20, 2025.

📚 More Plum Tree Planting Guides

🗺️

Plum Tree in Hawaii

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 12b Plum Tree Guide

All cities in your zone · Avg dates

→

Other Plants for Honolulu

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Growing Plum Tree in Zone 12b

Plum Tree (Prunus domestica) is a popular garden vegetable. In Honolulu, Hawaii, which is in USDA Hardiness Zone 12b, you should direct sow seeds around Thursday, November 20, 2025.

Your average last frost date is Thursday, January 1, 2026. Plum Tree grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.