When to plant kale depends on your local weather, but the good news is that kale is one of the easiest cool-season vegetables to grow. It handles chilly weather better than many garden crops and can give you fresh leaves in both spring and fall.
If you are planning growing kale in your home garden, timing is one of the first things to get right. Plant too early and cold soil can slow the seedlings down. Plant too late and hot weather may make young plants struggle.
When to Plant Kale in Spring
Spring is a great time to plant kale because the plants prefer cool weather. In many parts of the U.S., you can start planting kale several weeks before the last spring frost.
A simple rule is to plant kale about 3 to 6 weeks before your area’s average last frost date. Young kale plants are fairly cold tolerant, so a light frost usually is not a major problem.
If you are starting seeds indoors, sow them about 4 to 6 weeks before you plan to move them outside. This gives the seedlings enough time to develop a healthy root system.
For gardeners in colder areas, starting kale indoors can make spring planting easier. Once the soil can be worked and the weather begins to warm slightly, the young plants can be moved into the garden.
What If You Plant Kale Too Early?
Kale can tolerate cold weather, but that does not mean it grows quickly in very cold soil.
If the soil is still extremely cold and wet, seeds may take longer to germinate. Young plants may also grow slowly.
Instead of rushing, check the soil and weather first. If the ground is workable and daytime temperatures are beginning to rise, it is usually a much better time to plant.
When to Plant Kale in Fall
For many gardeners, fall is actually one of the best times to grow kale.
As summer heat starts to fade, kale can grow in cooler conditions and produce tender leaves. In some areas, you can continue harvesting well into late fall and even winter.
For a fall crop, try to plant kale 6 to 8 weeks before the first expected fall frost. This gives the plants enough time to become established before temperatures drop.
Remember that the first frost date is different from one location to another. Gardeners in northern states may need to plant much earlier than gardeners in the South.
Why Fall Kale Often Does So Well
Kale does not enjoy hot weather as much as cool weather. During a hot summer, plants can become stressed and may grow more slowly.
When fall arrives, cooler temperatures can make the growing conditions much better.
Another advantage is flavor. Kale leaves often taste sweeter after exposure to cool weather. A light frost can make the leaves especially pleasant to eat.
This is one reason I like planting a second crop in late summer. Instead of letting the vegetable garden slow down after summer, you can keep harvesting fresh greens.
Can You Plant Kale in Summer?
You can, but summer planting can be tricky.
Kale prefers temperatures that are roughly in the 40°F to 75°F range, with the best growth happening in cooler conditions. Hot weather can cause stress, especially for young seedlings.
If you want a fall harvest, you may need to start your kale during summer. The trick is to protect young plants from the worst heat.
Starting seeds in a partly shaded area can help. You can also start them indoors and move the seedlings outside when temperatures begin to drop.
The goal is to have healthy young plants ready to take off when cooler fall weather arrives.
How to Choose the Right Planting Time
Your USDA hardiness zone can give you a general idea of your climate, but it should not be the only thing you consider.
Pay attention to your local frost dates and actual weather conditions.
Here are a few simple guidelines:
Cold northern areas: Start spring kale indoors and plant outside before the last frost when the soil is workable. For fall, plant earlier so the crop has enough time to mature.
Milder areas: You may have a longer planting window in both spring and fall.
Warm southern areas: Fall and winter can be better for kale than summer. In some warm regions, kale can be grown through much of the winter.
Local weather matters more than a calendar date. If spring stays cold for several weeks, wait a little longer. If fall arrives early, adjust your planting schedule.
Planting Kale From Seeds
Kale is easy to start from seed.
Choose a sunny location with well-draining soil. Make shallow rows and sow the seeds about ¼ to ½ inch deep. Keep the soil evenly moist while the seeds are germinating.
Depending on temperature and conditions, seedlings may appear within about a week.
Once the seedlings have several true leaves, thin them if they are growing too close together. Crowded plants compete for light, water, and nutrients.
If you are transplanting seedlings, handle the roots gently and water them well after planting.
Give Kale Enough Sun
Kale grows best with plenty of sunlight. Aim for around 6 hours of sun or more each day when possible.
In cooler climates, full sun is usually a good choice.
In warmer areas, some afternoon shade can help protect plants from excessive heat. This can be especially useful when you are trying to establish a fall crop during the last part of summer.
Good sunlight helps kale produce strong plants and healthy leaves.
What Temperature Is Best for Kale?
Kale is a cool-season crop, so it performs best when temperatures are mild rather than extremely hot.
Cool nights are usually not a problem. In fact, established kale plants can tolerate frost and fairly cold temperatures.
Heat is often more difficult.
When temperatures stay high, kale may become stressed and growth can slow. The leaves may also become tougher or less appealing.
That is why planting around the cooler parts of the growing season usually gives better results.
How Long Does Kale Take to Grow?
Many kale varieties can be harvested in roughly 50 to 70 days from seed, although the exact timing depends on the variety and growing conditions.
You do not always have to wait until the plant reaches full size before harvesting.
You can pick a few of the larger outer leaves while allowing the center of the plant to continue growing. This gives you a longer harvest period.
For the best results, avoid removing too many leaves at one time. The plant still needs enough healthy foliage to keep growing.
Can Kale Survive Frost?
Yes. Kale is one of the vegetables that can handle frost quite well.
Established plants can continue growing after temperatures drop, although growth will slow as winter approaches.
In colder regions, you can protect plants with a row cover or another simple garden covering when severe cold is expected.
In milder climates, kale may continue producing for much of the winter.
This makes it a useful vegetable for gardeners who want something productive after summer crops are finished.
A Simple Kale Planting Calendar
Your exact dates will depend on where you live, but this basic schedule can help:
Late winter: Start seeds indoors for an early spring crop.
Early spring: Plant kale outdoors several weeks before the last frost in many areas.
Late spring: Continue harvesting spring plants while watching for increasing heat.
Summer: Start seeds for a fall crop, especially in cooler regions.
Late summer: Transplant fall kale into the garden as temperatures begin to cool.
Fall: Enjoy a long harvest as the weather gets colder.
Winter: In mild climates, established kale may continue producing.
Final Thoughts
The best time to plant kale is usually when the weather is cool, not during the hottest part of summer. Spring gives you an early crop, while fall can provide some of the sweetest and most reliable harvests of the year.
Before planting, check your local frost dates and look at the weather for the next few weeks. A little planning can make a big difference.
Once you get the timing right, kale is a rewarding vegetable to grow. It does not need perfect conditions, and with regular harvesting, a few plants can keep your kitchen supplied with fresh leaves for weeks.