When To Plant Kale In Southern California

If you’re wondering when to plant kale in Southern California, you’re in the right place. This leafy green is a superstar in our unique climate, and timing is everything for a successful harvest.

Southern California’s long, mild growing season is ideal for cool season planting. You can enjoy fresh kale for many months if you follow a simple schedule. This guide will walk you through the best planting windows, variety choices, and care tips tailored just for our region.

Kale thrives in cool weather, which makes our fall, winter, and early spring seasons perfect. The goal is to have your kale maturing when temperatures are between 60°F and 70°F during the day.

Here are the two primary planting times:

Late Summer to Early Fall (August – October): This is the absolute best time to plant. Seeds sown in late summer grow quickly as the heat fades, producing robust plants that will yield through the winter.
Late Winter to Early Spring (January – March): You can also plant as soon as the soil is workable after the chill of winter. These plants will grow rapidly and produce a harvest before the summer heat arrives, which can make kale taste bitter.

Avoid planting in peak summer. The intense heat stresses the plants, leading to poor germination, tough leaves, and premature bolting (flowering).

Understanding Your Microclimate

Southern California is a patchwork of microclimates. Your specific location will fine-tune your planting dates.

Coastal Areas (San Diego, Los Angeles, Santa Barbara): With the most temperate conditions, you have the longest kale season. You can often plant from July through April, with nearly year-round harvests.
Inland Valleys (San Fernando, Riverside): These areas experience hotter summers and colder winters. Stick to early fall (September-October) and late winter (February-March) plantings for the best results.
Desert Areas (Palm Springs): The season is shorter and more challenging. Focus on a strict fall planting (October-November) for winter harvest, and a very early spring planting if frost isn’t a concern.

Choosing the Right Kale Varieties

Selecting varieties that handle our climate well is key. All kale types grow here, but some are particularly reliable.

Lacinato (Dinosaur Kale): This Italian heirloom is a favorite for its sweet, wrinkled leaves. It holds up beautifully to both cool and slightly warmer weather.
Curly Scotch (Green or Red): The classic, frilly kale. It’s very cold-tolerant, making it excellent for winter gardens. The red varieties add stunning color.
Siberian Kale: Known for its tender, flat leaves, it’s one of the most cold-hardy options, perfect for colder inland winters.
Russian Red Kale: With a beautiful oak-leaf shape and purple veins, it’s both ornamental and delicious. It tends to be more heat-tolerant than some others, good for extending the season.

Starting from Seed vs. Transplants

You can begin kale from seed sown directly in the garden or from nursery transplants. Each method has it’s advantages.

Direct sowing is simple and avoids transplant shock. Simply plant seeds ¼ to ½ inch deep, spacing them about an inch apart. Later, you’ll thin the seedlings to 12-18 inches apart. For fall planting, starting seeds indoors in July can give you a head start before moving them outside when it cools.

Using transplants from a local nursery gets you to harvest faster. This is a great option if you miss the ideal seed-starting window. Just be gentle with the roots when planting.

Step-by-Step Planting Guide

Prepare Your Soil: Kale prefers rich, well-draining soil. Work in 3-4 inches of compost or well-rotted manure before planting. Aim for a soil pH between 6.0 and 7.0.
Plant at the Correct Depth: Sow seeds ½ inch deep. Set transplants at the same depth they were growing in their container. Don’t bury the stem.
Space Them Properly: Give plants plenty of room for air circulation. Space plants 12 to 18 inches apart in rows that are 18 to 24 inches apart.
Water Thoroughly: Water immediately after planting to settle the soil around the seeds or roots. Keep the soil consistently moist for good germination and growth.
Add Mulch: Apply a 2-3 inch layer of organic mulch (like straw or shredded leaves) around the plants. This conserves moisture, suppresses weeds, and keeps soil temperatures even.

Caring for Your Kale Plants

Once established, kale is relatively low-maintenance. Consistent care ensures a bountiful harvest.

Watering and Feeding

Kale likes even moisture. Water deeply 1-2 times per week, depending on rainfall and temperature. Drip irrigation or soaker hoses are ideal to keep leaves dry and prevent disease.

Feed your plants with a balanced organic fertilizer or a side-dressing of compost every 4-6 weeks. This supports steady leaf production, especially during the active growing periods in fall and spring.

Managing Pests and Problems

Common pests in Southern California include aphids, cabbage loopers, and whiteflies. Check the undersides of leaves regularly.

Blast aphids off with a strong spray of water.
Handpick cabbage worms or use an organic Bacillus thuringiensis (Bt) spray.
Floating row covers can prevent moths from laying eggs on plants.

Good spacing and avoiding overhead watering helps prevent fungal diseases like powdery mildew, which can appear in our humid coastal springs.

Harvesting and Enjoying Your Kale

You can begin harvesting young leaves when the plant is about 8 inches tall. Always harvest from the bottom up.

For mature leaves, pick the outer, oldest leaves first, leaving the central growing tip to produce more. A “cut-and-come-again” approach works wonderfully. The flavor of kale actually sweetens after a light frost, making winter harvests especially tasty.

Store unwashed kale in a plastic bag in your refrigerator’s crisper drawer for up to a week. For longer storage, kale freezes exceptionally well after a quick blanching.

Season Extension Tips

To get the most from your kale, consider these strategies:

Use shade cloth over spring plantings to protect them from an early heatwave and delay bolting.
In colder inland areas, use frost cloth or cold frames to protect plants from hard freezes, extending your harvest further into winter.
Succession plant by sowing a few new seeds every 3-4 weeks during the prime seasons for a non-stop supply.

Common Questions About Growing Kale

Can I grow kale in Southern California summer?
It’s not ideal. Heat causes bitterness and bolting. If you try, choose a heat-tolerant variety like ‘Red Russian’, plant in partial shade, and water consistently.

Why are my kale leaves turning yellow?
Yellowing can be caused by overwatering, poor drainage, a nitrogen deficiency, or natural aging of older leaves. Assess your watering and try a light fertilizer application.

How long does kale keep producing?
In our climate, a single planting in fall can often produce leaves for 5-7 months, right through spring. Plants will eventually bolt as days lengthen and temperatures rise.

What are good companion plants for kale?
Plant kale with other cool-season crops like beets, onions, herbs (dill, mint), and nasturtiums. Avoid planting near tomatoes or strawberries.

By following these simple guidelines, you can enjoy a plentiful and long-lasting harvest of nutritious kale from your own Southern California garden. The key is respecting its preference for cool weather and adjusting for your specific local conditions.