Oregon gardeners plant cabbage in April when consistent rain supports steady growth. Knowing the best time to plant cabbage in Oregon depends on your specific region, from the wet Willamette Valley to the high desert east of the Cascades. This guide breaks down exactly when to sow seeds and transplant seedlings for a bumper crop.
Cabbage loves cool weather. It thrives in Oregon’s spring and fall seasons. Plant too early and frost might kill young plants. Plant too late and summer heat will make heads split or bolt. Let’s get the timing right.
Best Time To Plant Cabbage In Oregon
The short answer: for a spring harvest, start seeds indoors 6-8 weeks before your last frost date. For most of western Oregon, that means starting seeds in February or early March. Transplant outdoors in April. For a fall harvest, direct sow seeds in July or early August.
But Oregon is not one climate. The coast, valley, mountains, and high desert all have different frost dates. You need to adjust for your area.
Understanding Oregon’s Climate Zones For Cabbage
Oregon has four main growing regions. Each one shifts the planting calendar.
- Western Valleys (Willamette Valley, Portland, Salem, Eugene): Mild, wet winters. Last frost around mid-April. First frost in late October. Best for spring and fall cabbage.
- Coast (Astoria, Newport, Coos Bay): Cool and foggy year-round. Last frost can be as late as May. First frost in early November. Cabbage grows slowly but steadily.
- High Desert (Bend, Redmond, Klamath Falls): Short, warm summers. Cold nights. Last frost in late May or early June. First frost in September. Only one growing window for cabbage.
- Eastern Oregon (Pendleton, La Grande, Ontario): Hot summers, cold winters. Last frost in May. First frost in late September. Spring planting is best.
Spring Cabbage: The Main Crop
Spring-planted cabbage is what most Oregon gardeners grow. It matures in June and July, before the hottest weather arrives.
Step 1: Start Seeds Indoors
Count backwards from your last frost date. For the Willamette Valley, last frost is around April 15. Count back 6-8 weeks. That puts seed starting at February 15 to March 1.
Use seed starting mix. Plant seeds 1/4 inch deep. Keep soil moist and warm (70°F). Seedlings emerge in 5-10 days. Give them strong light right away.
Step 2: Harden Off Seedlings
About 10 days before transplanting, start hardening off. Move seedlings outside for a few hours each day. Increase time over a week. Protect from wind and direct sun at first.
Step 3: Transplant Outdoors
Transplant when seedlings have 4-5 true leaves. Soil temperature should be at least 50°F. Space plants 18-24 inches apart in rows 2-3 feet apart. Water well after planting.
For the coast, wait until mid-May. For high desert, transplant in late May or early June. For eastern Oregon, transplant in early May.
Fall Cabbage: The Second Chance
Fall cabbage is actually easier in Oregon. Cool autumn weather helps heads form perfectly. Plus, fall cabbage stores well into winter.
Step 1: Direct Sow Seeds
Count backwards from your first frost date. For the Willamette Valley, first frost is around October 20. Cabbage needs 70-100 days to mature. Count back 90 days from first frost. That gives you a planting date around July 20 to August 1.
Sow seeds directly in the garden. Plant 1/2 inch deep. Thin seedlings to 18-24 inches apart when they have 2-3 leaves.
Step 2: Keep Seedlings Cool
July and August can be hot in Oregon. Water regularly. Use shade cloth if temperatures exceed 85°F. Mulch around plants to keep roots cool and moist.
Step 3: Harvest After Frost
Fall cabbage actually tastes sweeter after a light frost. The cold converts starches to sugar. Leave heads in the ground until you need them, as long as temperatures stay above 20°F.
For high desert, fall cabbage is risky. First frost comes early. You might not have enough time. Stick to spring planting there.
Varieties That Work Best In Oregon
Not all cabbage varieties perform equally in Oregon’s climate. Choose wisely.
- Early Season (Spring): ‘Golden Acre’, ‘Early Jersey Wakefield’, ‘Stonehead’. These mature in 60-70 days. Perfect for spring planting.
- Mid-Season (Spring or Fall): ‘Red Acre’, ‘Savoy King’, ‘Brunswick’. Mature in 70-85 days. Reliable in most Oregon regions.
- Late Season (Fall): ‘Danish Ballhead’, ‘Late Flat Dutch’, ‘Storage #4’. Mature in 85-100 days. Excellent for storage.
- Napa Cabbage: ‘Blues’, ‘Michihili’. These are actually Chinese cabbage. They grow faster (50-70 days). Plant in late summer for fall harvest.
Soil Preparation For Cabbage
Cabbage is a heavy feeder. It needs rich, well-drained soil with plenty of organic matter.
Test Your Soil
Oregon soils vary widely. Valley soils are often acidic. High desert soils are alkaline. Test pH. Cabbage prefers 6.0-6.8.
Amend The Soil
Add 2-4 inches of compost or well-rotted manure. Work it into the top 6-8 inches. Add a balanced fertilizer (10-10-10) at planting time. Follow package rates.
Improve Drainage
If you have heavy clay soil (common in the Willamette Valley), plant in raised beds. Cabbage roots rot in waterlogged soil.
Watering And Fertilizing Schedule
Cabbage needs consistent moisture. Inconsistent watering causes heads to crack or split.
Water Deeply
Give plants 1-1.5 inches of water per week. Water at the base, not overhead. Overhead watering promotes disease. Use drip irrigation or soaker hoses.
Mulch
Apply 2-3 inches of straw or grass clippings around plants. Mulch keeps soil cool, retains moisture, and suppresses weeds.
Fertilize Monthly
Side-dress with a nitrogen-rich fertilizer (like blood meal or fish emulsion) every 3-4 weeks. Stop fertilizing when heads begin to form. Too much nitrogen at that stage causes loose heads.
Common Pests And Problems In Oregon
Oregon gardens have specific cabbage pests. Know them before they ruin your crop.
- Cabbage Worms: Small green caterpillars. They chew holes in leaves. Use row covers from transplanting. Hand pick if you see them. Bt (Bacillus thuringiensis) works well.
- Aphids: Tiny insects on leaf undersides. They suck sap and spread disease. Blast them off with water. Use insecticidal soap for heavy infestations.
- Slugs And Snails: Oregon’s wet climate is perfect for slugs. They eat seedlings overnight. Use iron phosphate bait. Set beer traps. Remove hiding spots.
- Clubroot: A soil-borne disease that causes swollen, deformed roots. It thrives in acidic soil. Lime your soil to raise pH. Rotate crops. Don’t plant cabbage in the same spot for 3-4 years.
- Black Rot: Yellow V-shaped lesions on leaf edges. It spreads in wet weather. Use disease-free seeds. Rotate crops. Remove infected plants immediately.
Harvesting Cabbage At The Right Time
Harvesting at the right moment is crucial. Too early and heads are small. Too late and they split.
Check Head Firmness
Press the head with your palm. It should feel dense and firm. If it feels soft or spongy, wait a few more days.
Watch For Splitting
Heads split when they take up water too fast after a dry spell. If rain is forecast, twist the head slightly to break some roots. This slows water uptake.
Cut The Head
Use a sharp knife. Cut the stem about 1 inch below the head. Leave the outer leaves attached. They protect the head during storage.
Store Properly
Spring cabbage stores for 2-3 weeks in the refrigerator. Fall cabbage stores for 3-4 months in a cool, humid root cellar (32-40°F, 90% humidity). Wrap heads in newspaper or perforated plastic bags.
Succession Planting For Continuous Harvest
Don’t plant all your cabbage at once. Stagger plantings for a steady supply.
Spring Succession
Start seeds indoors every 2 weeks from February to March. Transplant in April and May. This gives you harvests from June through July.
Fall Succession
Direct sow seeds every 2 weeks from mid-July to mid-August. Harvest from October through November. Late plantings can be left in the ground under row covers for winter harvest.
Growing Cabbage In Containers
Limited space? No problem. Cabbage grows well in containers.
Choose The Right Pot
Use a pot at least 12 inches deep and 12 inches wide per plant. Larger is better. Ensure drainage holes.
Use Quality Potting Mix
Don’t use garden soil. It compacts in containers. Use a high-quality potting mix. Mix in compost for nutrients.
Water More Often
Containers dry out faster than garden beds. Check soil daily. Water when the top inch feels dry.
Fertilize Weekly
Container plants need more frequent feeding. Use a liquid fertilizer (like fish emulsion) every 1-2 weeks.
Companion Planting For Cabbage
Certain plants help cabbage grow better. Others attract pests. Know your friends and enemies.
Good Companions
- Beets, celery, onions, potatoes, herbs (dill, chamomile, sage)
- These plants repel pests or improve soil conditions.
Bad Companions
- Strawberries, tomatoes, pole beans, grapes
- These plants compete for nutrients or attract similar pests.
Regional Adjustments For Oregon
Let’s get specific for each Oregon region.
Willamette Valley
Last frost: April 15. First frost: October 20. Start seeds indoors February 15-March 1. Transplant April 15-May 1. Direct sow fall crop July 20-August 1. Use row covers for early spring plantings to protect from cold snaps.
Portland Metro
Similar to Willamette Valley but slightly warmer. Last frost around April 1. Start seeds indoors February 1-15. Transplant March 15-April 1. Fall crop direct sow July 15-August 1.
Coast
Last frost: May 1-15. First frost: November 1. Start seeds indoors March 1-15. Transplant May 1-15. Fall crop direct sow August 1-15. Use row covers to protect from wind and salt spray.
High Desert (Bend, Redmond)
Last frost: June 1. First frost: September 15. Start seeds indoors April 1-15. Transplant June 1-15. No fall crop possible. Use black plastic mulch to warm soil. Protect from late frost with row covers.
Eastern Oregon (Pendleton, La Grande)
Last frost: May 1-15. First frost: September 20. Start seeds indoors March 1-15. Transplant May 1-15. Fall crop direct sow July 1-15. Water regularly in hot summers.
Rogue Valley (Medford, Ashland)
Last frost: April 15. First frost: October 15. Start seeds indoors February 15-March 1. Transplant April 15-May 1. Fall crop direct sow July 15-August 1. Hot summers mean shade cloth may be needed.
Seed Starting Tips For Oregon Gardeners
Starting seeds indoors gives you a head start. Here’s how to do it right.
Use Seedling Heat Mats
Oregon homes can be cool in winter. Heat mats keep soil at 70°F for faster germination. Remove mats once seedlings emerge.
Provide Strong Light
Windowsills often don’t provide enough light. Use grow lights. Keep them 2-3 inches above seedlings. Raise lights as plants grow. Give 14-16 hours of light per day.
Thin Seedlings
Don’t let seedlings get crowded. Thin to one plant per cell or pot. Use scissors to cut unwanted seedlings at soil level. Don’t pull them out; you might damage roots.
Transplant Carefully
Harden off seedlings for 7-10 days before transplanting. Plant them slightly deeper than they were in the pot. Firm soil around roots. Water well.
Troubleshooting Common Problems
Even with perfect timing, problems can arise. Here’s what to look for.
Heads Won’t Form
Too much nitrogen or too little sunlight. Cabbage needs full sun (6+ hours). Reduce nitrogen fertilizer. Ensure plants are spaced properly.
Heads Are Loose
Inconsistent watering or high temperatures. Water regularly. Provide shade in hot weather. Plant at the right time.
Leaves Turn Yellow
Nitrogen deficiency or overwatering. Check soil moisture. Fertilize with a balanced fertilizer. Improve drainage.
Bolting (Going To Seed)
Stress from heat or cold. Plant at the right time for your region. Use row covers for protection. Choose bolt-resistant varieties.
Frequently Asked Questions
Can I plant cabbage in Oregon in the summer?
Summer planting is not ideal for head cabbage. Heat causes bolting and loose heads. However, you can plant Chinese cabbage (Napa) in late summer for fall harvest. Or plant cabbage in a shaded spot with extra water.
What is the latest I can plant cabbage in Oregon?
For fall harvest, direct sow seeds by August 1 in western Oregon. For eastern Oregon and high desert, plant by July 15. Later plantings may not have time to mature before frost.
Do I need to cover cabbage for frost in Oregon?
Mature cabbage tolerates light frost (down to 20°F). Young seedlings need protection. Use row covers or cloches if frost is forecast. Fall cabbage actually improves with frost.
How long does cabbage take to grow in Oregon?
Most varieties take 70-100 days from transplanting to harvest. Early varieties mature in 60-70 days. Late varieties take 85-100 days. Check seed packets for exact days to maturity.
Can I grow cabbage year-round in Oregon?
In mild coastal areas, you can grow cabbage almost year-round with protection. In the Willamette Valley, spring and fall crops work well. Winter cabbage is possible with row covers or cold frames. High desert and eastern Oregon have a shorter growing season.
Final Tips For Oregon Cabbage Success
You now know the best time to plant cabbage in Oregon. Here are a few last reminders.
Start seeds indoors for spring crops. Direct sow for fall crops. Water consistently. Watch for pests. Harvest at the right time. Store properly.
Cabbage is one of the most rewarding vegetables to grow in Oregon. The cool, moist climate is perfect for it. With the right timing, you’ll have fresh cabbage from June through November. And stored cabbage will last through winter.