When to Plant Impatiens in Los Angeles, California (90021)

Location

Los Angeles, California

ZIP Code

90021

USDA Zone

10b

Last Frost

Thursday, January 15, 2026

📅 Your 2026 Planting Dates

Start Seeds Indoors

Thursday, November 6, 2025

Transplant Outdoors

Thursday, January 29, 2026

Based on last frost Thursday, January 15, 2026 · Zone 10b

Pro tip: Start Impatiens seeds indoors 10 weeks before your last frost date, then transplant outdoors around Thursday, January 29, 2026.

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🌿 Plant Details

Scientific Name Impatiens walleriana

Days to Maturity 60 days

Mature Height 8-18"

Spread 12"

☀️ Growing Requirements

☀️

Sun

Partial to Full Shade (2-4 hours)

💧

Water

Regular (1-2 inches/week)

↔️

Spacing

8" apart

🌱

Planting Depth

0.125" deep

Seeds typically germinate in 14-21 days

Ready to Plant Impatiens in Los Angeles?

Get your seeds now so they're ready by Thursday, November 6, 2025.

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🤝 Good Companions

BegoniaFernHostas

🤝

Full Companion Planting Guide for Impatiens

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

🛠️ Supplies You'll Need

🌱 Seed Starting Trays 🪴 Seed Starting Mix 💡 Grow Lights 🌡️ Heat Mat 🌍 Flower Garden Soil ✂️ Pruning Shears 🚿 Watering Can

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🌾 Seed Saving Guide

🟡 Moderate

⚠️ Many varieties are F1 hybrid — look for OP/heirloom types

When to Harvest Seed

Seed pods explode when touched — bag ripening pods with a rubber band before they burst.

Processing

Collect seeds from bags as pods burst. Tiny seeds — dry on paper towel for 1 week.

Seed Viability

Up to 2 years when stored cool, dark, and dry.

Pro Tip

Most garden impatiens are F1 hybrids. New Guinea impatiens are almost always hybrid — look for old-fashioned OP varieties.

🪴

Raised Bed Planting Guides

A 4×8 bed fits 72 plants of Impatiens. See plant counts, spacing grids, and companion pairings for every bed size →

Frequently Asked Questions

When should I plant Impatiens in Los Angeles, California? +

In Los Angeles (Zone 10b), start Impatiens seeds indoors around Thursday, November 6, 2025 and transplant outdoors around Thursday, January 29, 2026.

What is the last frost date for Los Angeles, California? +

The average last spring frost date for Los Angeles, California (ZIP 90021) is around Thursday, January 15, 2026. This is based on NOAA climate normals for USDA Zone 10b.

How long does Impatiens take to grow? +

Impatiens typically matures in about 60 days from transplanting. In Los Angeles, that means you can expect harvest around Thursday, January 29, 2026 plus 60 days.

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

Impatiens should be started indoors 10 weeks before your last frost date. In Los Angeles, that means starting around Thursday, November 6, 2025.

📚 More Impatiens Planting Guides

🗺️

Impatiens in California

Zone-by-zone breakdown · Full state guide

→ 🌡️

Zone 10b Impatiens Guide

All cities in your zone · Avg dates

→

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Growing Impatiens in Zone 10b

Impatiens (Impatiens walleriana) is a popular garden vegetable. In Los Angeles, California, which is in USDA Hardiness Zone 10b, you should start seeds indoors around Thursday, November 6, 2025.

Your average last frost date is Thursday, January 15, 2026. Plan to transplant your Impatiens seedlings outdoors around Thursday, January 29, 2026, about 2 weeks after your last frost date.