Oklahoma’s unpredictable springs make March the safest month for cabbage planting. If you are looking for the best time to plant cabbage in oklahoma, you need to pay close attention to your local frost dates and soil temperatures. Cabbage is a cool-season crop that thrives when temperatures stay between 45°F and 75°F, which makes early spring or late summer the ideal windows for planting in the Sooner State.
Getting the timing right can mean the difference between tight, sweet heads and bolting, bitter plants. In this guide, we will walk you through exactly when to plant cabbage in Oklahoma, how to prepare your soil, and what to do if the weather turns against you.
Best Time To Plant Cabbage In Oklahoma
For most of Oklahoma, the best time to plant cabbage in oklahoma is from mid-March to early April for a spring harvest. For a fall crop, aim for late July to mid-August. These windows give cabbage the cool weather it needs to form solid heads without getting stressed by heat.
Oklahoma spans USDA hardiness zones 6a in the panhandle to 8a in the southeast. This means your exact planting dates will vary depending on where you live. In the north, spring comes later and fall comes earlier. In the south, you have a bit more flexability.
Spring Planting Window By Region
Here is a simple breakdown for spring cabbage planting across Oklahoma:
- Northern Oklahoma (zones 6a-6b): Plant transplants from March 20 to April 10. Soil should be at least 40°F.
- Central Oklahoma (zones 7a-7b): Plant from March 10 to March 30. You can start seeds indoors in late January.
- Southern Oklahoma (zones 8a): Plant from February 25 to March 20. Watch for late freezes.
If you plant too early, a hard freeze can kill young plants. If you plant too late, the heat will cause the cabbage to bolt or split. That is why March is the safest bet for most gardeners in the state.
Fall Planting Window By Region
Fall cabbage often tastes sweeter because cool weather increases sugar content. Here is when to plant for a fall harvest:
- Northern Oklahoma: Plant transplants from July 20 to August 5.
- Central Oklahoma: Plant from July 25 to August 10.
- Southern Oklahoma: Plant from August 1 to August 20.
Fall planting requires you to start seeds indoors about 6-8 weeks before your transplant date. This gives the cabbage time to mature before the first hard frost, which typically hits in October or November.
Understanding Oklahoma’s Climate For Cabbage
Oklahoma weather is famous for being unpredictable. You can have a 70°F day in February followed by a snowstorm in March. This makes timing tricky for cool-season crops like cabbage.
Cabbage prefers steady temperatures between 60°F and 70°F during the day and 40°F to 50°F at night. When temperatures spike above 80°F, cabbage plants can bolt, meaning they send up a flower stalk and stop producing a solid head.
Frost Dates You Need To Know
Your last spring frost date is the key to safe planting. Here are average last frost dates for Oklahoma:
- Panhandle (Guymon, Boise City): April 25 to May 5
- Northern Oklahoma (Enid, Ponca City): April 10 to April 20
- Central Oklahoma (Oklahoma City, Norman): March 30 to April 10
- Southern Oklahoma (Ardmore, Durant): March 15 to March 25
Your first fall frost date is equally important for fall planting. Average first frost dates range from October 10 in the panhandle to November 5 in the south. Cabbage needs about 70 to 100 days to mature, so count backward from your first frost to find your planting window.
Soil Temperature Matters More Than Air Temperature
Many gardeners make the mistake of planting based on air temperature alone. Cabbage seeds germinate best when soil temperature is between 45°F and 85°F, with 70°F being ideal. If the soil is too cold, seeds will rot. If it is too hot, germination rates drop.
Use a soil thermometer to check your garden bed. Insert it 2 inches deep in the morning. If the reading is consistently above 40°F for three days in a row, you are safe to plant transplants. For direct seeding, wait until soil hits at least 50°F.
How To Plant Cabbage In Oklahoma Step By Step
Follow these steps to give your cabbage the best start possible. Each step is tailored to Oklahoma’s unique growing conditions.
Step 1: Choose The Right Variety
Not all cabbage varieties perform well in Oklahoma. Look for heat-tolerant and disease-resistant types. Here are some top choices:
- Early Jersey Wakefield: Matures in 63 days. Great for spring planting.
- Stonehead: Matures in 68 days. Very heat tolerant.
- Red Acre: Matures in 75 days. Good for both spring and fall.
- Savoy King: Matures in 85 days. Handles temperature swings well.
For fall planting, choose varieties that mature in 70-90 days. This gives you enough time before the first frost.
Step 2: Start Seeds Indoors
For spring planting, start seeds indoors 6-8 weeks before your last frost date. For fall planting, start seeds indoors 6-8 weeks before your transplant date.
- Fill seed trays with a sterile seed-starting mix.
- Plant seeds ¼ inch deep.
- Keep soil moist but not waterlogged.
- Place trays under grow lights or in a sunny window.
- Maintain temperatures between 60°F and 70°F.
- Harden off seedlings for 7-10 days before transplanting.
Hardening off means gradually exposing seedlings to outdoor conditions. Start with one hour of shade, then increase by one hour each day. This prevents transplant shock.
Step 3: Prepare Your Garden Bed
Cabbage needs full sun and rich, well-draining soil. Oklahoma soil is often heavy clay, so you may need to amend it.
- Choose a spot that gets at least 6 hours of direct sun daily.
- Test your soil pH. Cabbage prefers 6.0 to 6.8.
- Add 2-3 inches of compost or well-rotted manure.
- Work in a balanced fertilizer like 10-10-10 at a rate of 1 pound per 100 square feet.
- Raise beds if your soil drains poorly.
If you have clay soil, consider planting in raised beds or adding sand and organic matter to improve drainage. Cabbage roots do not like sitting in wet soil.
Step 4: Transplant Seedlings
When your seedlings are 4-6 weeks old and have 4-5 true leaves, they are ready to go outside.
- Space plants 12-24 inches apart, depending on variety.
- Space rows 24-36 inches apart.
- Dig a hole slightly larger than the root ball.
- Place the seedling at the same depth it was in the pot.
- Water thoroughly after planting.
- Apply a layer of mulch to retain moisture and regulate soil temperature.
If a late freeze is predicted, cover your plants with row covers or old sheets overnight. Remove them in the morning when temperatures rise.
Step 5: Water And Fertilize Consistently
Cabbage needs about 1-1.5 inches of water per week. In Oklahoma’s hot summers, you may need to water more frequently.
- Water deeply at the base of the plant, not overhead.
- Use drip irrigation or soaker hoses to keep foliage dry.
- Fertilize with a nitrogen-rich fertilizer 3-4 weeks after transplanting.
- Side-dress with compost or a balanced fertilizer again when heads begin to form.
Inconsistent watering can cause heads to split. Keep the soil evenly moist, especially as the heads mature.
Common Cabbage Problems In Oklahoma
Even with perfect timing, cabbage can face challenges in Oklahoma. Here is what to watch for and how to handle it.
Bolting From Heat
If temperatures soar above 80°F for several days, cabbage may bolt. This is more common in spring plantings that go in too late.
To prevent bolting:
- Plant early enough to avoid summer heat.
- Use shade cloth if a heat wave hits.
- Choose bolt-resistant varieties.
Cabbage Worms And Loopers
These green caterpillars can devour leaves quickly. They are active from spring through fall.
- Check undersides of leaves regularly.
- Handpick caterpillars when you see them.
- Apply Bt (Bacillus thuringiensis) as a natural control.
- Use row covers to prevent butterflies from laying eggs.
Club Root
This soil-borne disease causes roots to swell and plants to wilt. It is more common in acidic soil.
- Test soil pH and keep it above 6.0.
- Rotate crops. Do not plant cabbage in the same spot for 3-4 years.
- Remove and destroy infected plants.
Splitting Heads
Heads split when they take up water too quickly after a dry period. This often happens after a heavy rain.
- Water consistently to avoid stress.
- Harvest heads as soon as they feel firm.
- If splitting starts, twist the plant slightly to break some roots and slow water uptake.
Harvesting Cabbage At The Right Time
Knowing when to harvest is just as important as knowing when to plant. Cabbage is ready when the head feels firm and solid when squeezed.
Here are signs your cabbage is ready:
- The head is 4-8 inches in diameter, depending on variety.
- The head feels dense and hard.
- The outer leaves may start to yellow slightly.
To harvest, cut the stem at the base with a sharp knife. Leave the outer leaves in place. In some cases, you may get a second crop of small heads from the remaining stalk.
For spring cabbage, harvest before temperatures consistently hit 80°F. For fall cabbage, you can leave heads in the ground through light frosts, which actually improve flavor. But harvest before a hard freeze.
Frequently Asked Questions
Can I Plant Cabbage Seeds Directly In The Ground In Oklahoma?
Yes, you can direct-seed cabbage in Oklahoma, but it is riskier. Direct seeding works best for fall planting when soil is warm. For spring, transplants give you a head start and better results. If you direct seed, plant ½ inch deep and thin seedlings to 12-18 inches apart.
What Is The Latest I Can Plant Cabbage In Oklahoma For Fall?
The latest safe planting date for fall cabbage in Oklahoma is mid-August in the north and early September in the south. You need at least 70 days before the first hard frost. Check your local frost date and count backward to find your deadline.
Should I Cover Cabbage If A Freeze Is Predicted?
Yes, cover young cabbage plants if temperatures drop below 28°F. Use row covers, old blankets, or plastic sheeting supported by stakes. Remove covers in the morning when temperatures rise above freezing. Mature cabbage can handle light frosts down to 26°F without damage.
How Do I Know If My Soil Is Warm Enough For Cabbage In Oklahoma?
Use a soil thermometer. Insert it 2 inches deep in the morning. For transplants, soil should be at least 40°F. For direct seeding, wait until soil is 50°F or warmer. If you do not have a thermometer, watch for soil to be crumbly and not cold to the touch.
Can I Grow Cabbage In Containers In Oklahoma?
Yes, cabbage grows well in containers. Use a pot at least 12 inches deep and 12 inches wide for one plant. Fill with quality potting mix and keep the soil consistently moist. Place the container in full sun. Container cabbage may need more frequent watering, especially in Oklahoma’s heat.
Final Tips For Oklahoma Cabbage Success
Planting at the right time is the most important factor, but a few extra steps can make a big difference.
- Keep a garden journal. Note your planting dates, weather patterns, and harvest results. This helps you refine your timing each year.
- Join a local gardening group. Oklahoma gardeners share tips specific to your microclimate.
- Watch the 10-day forecast before planting. If a cold snap is coming, wait a few days.
- Mulch heavily. Straw or shredded leaves keep soil cool and moist, which cabbage loves.
- Rotate your cabbage family crops. Do not plant cabbage, broccoli, or cauliflower in the same spot two years in a row.
With the right timing and a little care, you can enjoy fresh, homegrown cabbage from your Oklahoma garden in both spring and fall. Start planning your planting dates now, and you will be rewarded with tight, sweet heads that taste far better than anything from the store.