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You should plant out cabbages in the late afternoon or on a cloudy day, roughly two to four weeks before your last expected frost date.
That timing is the sweet spot for getting these cool-weather crops off to a strong start in your garden.
But knowing when to plant out cabbages isn’t just about picking a random date on the calendar, it’s about understanding your local climate, soil temperature, and the growth stage of your seedlings.
In this post, we’ll dig into the best times to plant out cabbages, the signs your seedlings are ready, and the common mistakes to avoid so your cabbage patch thrives.
Let’s get those leafy greens into the ground at the perfect moment.
When to Plant Out Cabbages: The Ideal Window
The answer to when to plant out cabbages depends on whether you’re aiming for a spring or fall crop, and each season has its own perfect window.
For a spring harvest, you’ll want to plant out cabbages as soon as the soil can be worked, usually two to four weeks before the last frost.
Cabbages are tough cookies, they can handle a light frost, and even a hard freeze won’t kill them if they’re properly hardened off.
For a fall crop, the timing shifts, and you should plant out cabbages about six to eight weeks before your first fall frost date.
This gives them enough time to mature in the cooler autumn weather, which actually makes the heads sweeter and crunchier.
The key is to avoid the heat of summer, as cabbages bolt (go to seed) and turn bitter when temperatures soar above 80°F.
So, the real answer to when to plant out cabbages is: early spring or late summer, never in the middle of a heatwave.
1. Spring Planting: Timing It Right After the Chill
In most regions, you can plant out cabbages in early spring, about two to four weeks before the last expected frost date.
Check your local frost dates using an online tool or your extension office, because this is your best guide.
If you start your seeds indoors, you’ll want to begin them about six to eight weeks before that planting date.
The seedlings should have four to six true leaves and a sturdy stem before they face the great outdoors.
When you plant out cabbages in spring, the soil temperature should be at least 45°F, though they’ll germinate and grow best in soil around 60-70°F.
Don’t rush it if the ground is still frozen or waterlogged, as cold, wet soil can cause the roots to rot.
A light frost after you plant out cabbages is totally fine, but a prolonged deep freeze can stress young transplants.
2. Fall Planting: The Cool-Season Champion
For a fall crop, you should plant out cabbages in mid-to-late summer, about six to eight weeks before your first fall frost.
This means you’ll be planting when the days are still warm, but the nights are starting to cool down.
The trick here is to get the plants established before the intense heat peaks, or you risk them bolting.
You can start fall cabbages indoors in late summer, or direct sow them in the garden, though transplanting gives them a head start.
When you plant out cabbages for fall, choose a spot that gets full sun but also has some afternoon shade if you live in a hot climate.
Fall-grown cabbages often taste better because the cooler temperatures encourage the plants to store more sugars.
So, if you’re asking when to plant out cabbages for the best flavor, fall is your answer.
How to Know Your Cabbage Seedlings Are Ready to Plant Out
Timing is only half the battle, you also need to make sure your seedlings are physically ready to plant out cabbages.
The number one sign is the number of true leaves, not the first two baby leaves (cotyledons), but the real ones that follow.
Your seedlings should have at least four to six true leaves, which usually happens about four to six weeks after germination.
The stem should be thick and sturdy, not thin and leggy, which happens when seedlings don’t get enough light.
If you can gently tug on the seedling and the root ball holds together, they’re ready for transplant.
Another clue is the root system, healthy roots should be white and fill the container without circling too much.
If the roots are circling the pot, they’re root-bound, and you should plant them out sooner rather than later.
Finally, your seedlings need to be hardened off before you plant out cabbages, which means gradually exposing them to outdoor conditions.
Start with an hour outside in a sheltered spot, then increase the time by an hour each day over a week.
This process hardens the cell walls and reduces transplant shock, so your cabbages won’t wilt or stall after planting.
Best Conditions for Planting Out Cabbages
When you plant out cabbages, the conditions you choose can make or break their early growth.
Here’s what your cabbages need to hit the ground running.
1. Soil Temperature and Quality
Cabbages prefer a soil pH between 6.5 and 6.8, which is slightly acidic to neutral.
Before you plant out cabbages, amend your soil with plenty of compost or well-rotted manure, as they’re heavy feeders.
The soil should be well-draining, with a crumbly texture that holds moisture without staying soggy.
Test the soil temperature with a simple probe or thermometer, and aim for at least 45°F for spring planting.
If the soil is too cold, the roots won’t grow and the plant may stay stunted for weeks.
On the flip side, if the soil is too hot (above 80°F), the cabbages may bolt, so fall planting is better for southern climates.
2. Sunlight and Spacing
Cabbages need at least six hours of direct sunlight each day, though they appreciate some afternoon shade in hot regions.
When you plant out cabbages, space them about 12 to 24 inches apart, depending on the variety.
Smaller varieties like ‘Pixie’ can be planted 12 inches apart, while larger ones like ‘Copenhagen Market’ need 24 inches.
Proper spacing allows for good air circulation, which prevents fungal diseases like black rot and clubroot.
Plant them slightly deeper than they were in their pots, burying the stem up to the first set of true leaves.
This encourages more roots to form along the buried stem, giving your cabbage a stronger anchor.
3. Watering and Mulching
Right after you plant out cabbages, water them thoroughly to settle the soil around the roots.
Keep the soil consistently moist, but not waterlogged, as cabbages need about 1-1.5 inches of water per week.
A layer of organic mulch, like straw or shredded leaves, helps retain moisture and keep the soil cool.
Mulch also suppresses weeds that would compete with your young cabbages for nutrients and water.
Just make sure the mulch doesn’t touch the stems, as this can cause rot.
If you plant out cabbages in the heat of the day, water them again in the evening to help them recover.
Common Mistakes to Avoid When You Plant Out Cabbages
Even experienced gardeners slip up sometimes, so here are the top mistakes to dodge when you plant out cabbages.
The biggest one is planting too late in spring, which exposes your cabbages to summer heat and triggers bolting.
Another is skipping the hardening-off process, which leads to sunburned, shocked seedlings that struggle to recover.
Planting too deep or too shallow is another classic blunder, so aim for that first true leaf just above soil level.
Overcrowding is a common issue, as folks underestimate how big cabbage heads get, so stick to the spacing guidelines.
Finally, don’t plant out cabbages in the same spot where other brassicas (like broccoli or kale) grew last year.
This prevents soil-borne diseases like clubroot from building up in the soil, which can devastate your crop.
Rotate your crops every three years to keep your cabbage patch healthy and productive.
So, When Is the Best Time to Plant Out Cabbages?
The best time to plant out cabbages is two to four weeks before the last frost for a spring crop, or six to eight weeks before the first frost for a fall crop.
Cabbages are cold-hardy, so they can tolerate a light frost, but they hate the heat, so aim for cool, mild conditions.
Make sure your seedlings have four to six true leaves and are properly hardened off before transplanting.
And don’t forget to check your soil temperature, spacing, and watering so your cabbages establish quickly.
When you plant out cabbages at the right time and under the right conditions, you’ll be rewarded with firm, sweet heads.
So, whether you’re a spring planter or a fall fanatic, timing is everything, and now you’ve got it down.
Happy planting, and here’s to a bumper crop of crisp, delicious cabbages from your garden.