When to Plant Kale in Los Alamitos, California (90721)
Location
Los Alamitos, California
ZIP Code
90721
USDA Zone
10a
Last Frost
Sunday, January 25, 2026
📅 Planting Calendar
Pro Tip: Sow Kale directly outdoors 6 weeks before your last frost date.
🌿 Plant Details
☀️ Growing Requirements
☀️
Sun
Full Sun to Partial Shade
💧
Water
Regular (1-1.5 inches/week)
↔️
Spacing
18" apart
🌱
Planting Depth
0.5" deep
Seeds typically germinate in 5-10 days
Ready to Plant Kale in Los Alamitos?
Get your seeds now so they're ready by Sunday, December 14, 2025.
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🛠️ Supplies You'll Need
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Common Kale Varieties
Popular cultivars to look for at your local nursery or seed supplier.
Curly Scarlet
Frilly, blue-green leaves with a slightly bitter, peppery flavor; very cold-hardy.
Lacinato (Tuscan Kale)
Long, dark blue-green leaves with a mild, earthy flavor; preferred in Italian cooking.
Red Russian
Flat, lobed grey-green leaves with purple stems; the most tender and sweet eating kale.
Winterbor
Very cold-hardy curly kale that sweetens after frost; productive through winter in mild zones.
Rainbow Lacinato
Colorful kale with streaks of purple, pink, and green; nutritious and ornamental.
Common Kale Problems
What to watch for — and how to fix it before it spreads.
Pests
Velvety green caterpillar that chews large holes in leaves; white butterflies laying eggs are the tell.
Use row covers; apply Bacillus thuringiensis (Bt) when caterpillars are small.
Light green caterpillar that loops when walking; similar damage to imported cabbageworm.
Bt spray; row covers; handpick; attract parasitic wasps with flowering herbs.
Gray-green waxy aphids form dense colonies on leaf undersides; plants become sticky and sooty.
Strong water blast; neem oil; the yellow parasitic wasps that appear in colonies are doing your work — leave them.
Tiny black beetles create dozens of small holes in leaves; seedlings can be devastated.
Use row covers on transplants; apply kaolin clay or diatomaceous earth around plants.
Diseases
Bacterial disease causing V-shaped yellow lesions from leaf edges with black veins inside.
Use certified disease-free seed; avoid overhead irrigation; destroy infected plants.
Yellow patches on upper leaf with gray-purple spores beneath; thrives in cool, wet weather.
Improve airflow; avoid wetting foliage; apply copper fungicide preventively.
Common Mistakes
Removing too many outer leaves stunts plant growth.
Wait until leaves are palm-sized before harvesting; always leave at least 4–5 inner leaves.
Kale hit by frost sweetens dramatically — many gardeners only grow spring kale and miss the best flavor.
Plant a fall crop 6–8 weeks before first fall frost; harvest into winter in Zones 7+.
🌾 Seed Saving Guide
🔴 DifficultWhen to Harvest Seed
Harvest seed pods just as they turn yellow-tan — pods shatter and drop seeds when fully ripe.
Processing
Thresh dried pods, winnow seeds from pod fragments.
Seed Viability
Up to 5 years when stored cool, dark, and dry.
Pro Tip
B. oleracea — crosses with broccoli, cabbage, Brussels sprouts, and collards. Isolate by 1000 feet.
Raised Bed Planting Guides
A 4×8 bed fits 14 plants of Kale. See plant counts, spacing grids, and companion pairings for every bed size →
Frequently Asked Questions
When should I plant Kale in Los Alamitos, California? +
In Los Alamitos (Zone 10a), direct sow Kale outdoors around Sunday, December 14, 2025.
What is the last frost date for Los Alamitos, California? +
The average last spring frost date for Los Alamitos, California (ZIP 90721) is around Sunday, January 25, 2026. This is based on NOAA climate normals for USDA Zone 10a.
How long does Kale take to grow? +
Kale typically matures in about 55 days from direct sowing. In Los Alamitos, that means you can expect harvest around Sunday, December 14, 2025 plus 55 days.
Should I start Kale indoors or direct sow in California? +
Kale does best when direct sown outdoors. In Los Alamitos, sow directly around Sunday, December 14, 2025.
Other Plants for Los Alamitos
Growing Kale in Zone 10a
Kale (Brassica oleracea) is a popular garden vegetable. In Los Alamitos, 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. Kale grows well when direct sown, as it doesn't transplant well or germinates quickly outdoors.