Maryland’s temperate weather allows kale planting in early spring and late summer for two crops. Knowing the best time to plant kale in Maryland is key to getting a steady harvest of this nutrient-packed leafy green. You can enjoy fresh kale from your garden for most of the year if you time your planting right.
Kale loves cool weather. It actually tastes sweeter after a light frost. That makes Maryland’s climate perfect for growing it. Whether you live near the Chesapeake Bay or in the mountains, you can grow kale successfully.
This guide will walk you through exactly when to plant kale in Maryland. You’ll learn about soil temperature, frost dates, and variety selection. Let’s get started.
Understanding Maryland’s Growing Zones
Maryland spans USDA hardiness zones 5b through 8a. This affects your planting calendar. Western Maryland is colder, while the Eastern Shore and southern parts are warmer.
Your specific zone determines the exact dates for planting. But the general rule stays the same: plant kale when the soil is cool but not frozen.
Zone 5B And 6A: Western Maryland
If you live in Garrett County or Allegany County, you’re in a cooler zone. Your last spring frost usually happens around mid-May. Your first fall frost comes in early October.
For spring planting, aim for late March to early April. For fall planting, start seeds in late July or early August.
Zone 6B And 7A: Central Maryland
This includes Baltimore, Washington DC suburbs, and Frederick. Last spring frost is typically mid-April. First fall frost is mid-October.
Plant spring kale in early April. For fall crops, start seeds in early August.
Zone 7B And 8A: Southern Maryland And Eastern Shore
Areas like St. Mary’s County and the lower Eastern Shore are warmer. Last spring frost is late March to early April. First fall frost is late October to early November.
Plant spring kale in mid-March. For fall, start seeds in mid-August.
Best Time To Plant Kale In Maryland
The exact timing depends on whether you want a spring crop or a fall crop. Both seasons work well in Maryland. Here’s the breakdown.
Spring Planting: March To April
Kale seeds germinate in soil as cool as 40°F. But they do best when soil is between 60°F and 65°F. You can plant seeds directly in the ground 4 to 6 weeks before the last frost.
In Maryland, that means:
- Western MD: Late March to early April
- Central MD: Early to mid-April
- Southern MD: Mid-March to early April
Transplants can go out 2 to 3 weeks before the last frost. They handle light frosts well. Just protect them if a hard freeze is forecasted.
Step-By-Step Spring Planting
- Prepare your garden bed with compost or well-rotted manure
- Sow seeds 1/4 to 1/2 inch deep
- Space seeds 12 to 18 inches apart in rows
- Water gently after planting
- Thin seedlings to 12 inches apart when they have 4 true leaves
- Mulch around plants to keep soil cool and moist
Fall Planting: July To August
Fall kale is often sweeter than spring kale. The cool nights and light frosts convert starches to sugars. This gives you a milder, less bitter taste.
Count back from your first fall frost. Kale needs 50 to 75 days to mature, depending on the variety. Plant so that kale reaches maturity just before or after the first frost.
In Maryland, that means:
- Western MD: Late July to early August
- Central MD: Early to mid-August
- Southern MD: Mid-August to early September
Step-By-Step Fall Planting
- Choose a spot that gets full sun but some afternoon shade in hot weather
- Amend soil with compost to retain moisture
- Sow seeds 1/4 inch deep, 12 inches apart
- Water deeply and regularly, especially during dry spells
- Thin seedlings to 12 inches apart
- Apply a layer of mulch to keep soil cool
- Cover with row covers if temperatures stay above 80°F
Soil Preparation And Requirements
Kale grows best in well-drained, fertile soil with a pH between 6.0 and 7.5. Test your soil before planting. Add lime if the pH is too low.
Work in 2 to 3 inches of compost or aged manure. This provides nutrients and improves drainage. Kale is a heavy feeder, so don’t skip this step.
Fertilizing Kale
Kale needs nitrogen for leafy growth. Use a balanced fertilizer like 10-10-10 at planting time. Side-dress with nitrogen-rich fertilizer 3 to 4 weeks after transplanting.
Fish emulsion or blood meal work well for organic gardens. Apply every 2 to 3 weeks during the growing season.
Kale Varieties For Maryland
Not all kale varieties grow the same in Maryland. Some handle heat better. Others are more cold-tolerant. Choose based on your planting season.
Best Spring Varieties
- Vates Blue Curled: Cold-hardy, slow to bolt in heat
- Winterbor: Very cold-tolerant, good for early spring
- Red Russian: Tender leaves, grows quickly
- Dwarf Siberian: Compact, good for small spaces
Best Fall Varieties
- Lacinato (Dinosaur): Heat-tolerant, sweet after frost
- Redbor: Ornamental and edible, handles heat well
- White Russian: Similar to Red Russian but milder
- Starbor: Hybrid, very productive in fall
Watering And Care
Kale needs consistent moisture. Water 1 to 1.5 inches per week. More in hot weather. Less in cool weather.
Water at the base of plants to avoid wet leaves. Wet leaves can lead to fungal diseases. Drip irrigation or soaker hoses work best.
Mulching
Mulch keeps soil cool and moist. It also suppresses weeds. Use straw, shredded leaves, or grass clippings. Apply a 2-inch layer around plants.
Pest Management
Cabbage worms, aphids, and flea beetles love kale. Use row covers to protect young plants. Handpick caterpillars. Spray neem oil for aphids.
Companion planting helps too. Plant kale near onions, garlic, or dill. These repel pests naturally.
Harvesting Kale
You can start harvesting baby kale leaves when they are 3 to 4 inches tall. For full-sized leaves, wait until the plant has 10 to 12 leaves.
Harvest from the bottom up. Pick the oldest, largest leaves first. Leave the inner leaves to keep growing. This gives you a continuous harvest.
When To Harvest
- Baby kale: 30 to 40 days after planting
- Full-sized leaves: 50 to 75 days after planting
- After frost: Leaves are sweeter, harvest as needed
Overwintering Kale
Kale can survive winter in Maryland with protection. In zones 7 and 8, it often overwinters without help. In colder zones, use a cold frame or heavy row cover.
Plants go dormant in deep cold. They resume growth in early spring. You’ll get an early harvest before spring-planted kale is ready.
Common Mistakes To Avoid
Even experienced gardeners make mistakes with kale. Here are the most common ones.
- Planting too late in spring: Kale bolts in hot weather
- Planting too early in fall: Heat stress stunts growth
- Overcrowding: Kale needs space for air circulation
- Underwatering: Leaves become tough and bitter
- Ignoring pests: Check plants weekly for damage
Frequently Asked Questions
Can I plant kale in Maryland in summer?
Summer planting is not ideal. Kale prefers cool weather. If you must plant in summer, choose a heat-tolerant variety like Lacinato. Provide afternoon shade and consistent water.
How late can I plant kale in Maryland?
You can plant kale as late as early September in southern Maryland. In western Maryland, late August is the cutoff. The key is to allow 50 to 75 days before a hard freeze.
Does kale need full sun in Maryland?
Kale grows best in full sun (6 to 8 hours daily). In hot summer areas, some afternoon shade helps prevent bolting. Fall crops can handle more sun.
Can I grow kale in containers in Maryland?
Yes. Use a pot at least 12 inches deep and wide. Fill with quality potting soil. Water more often since containers dry out faster. Choose compact varieties like Dwarf Siberian.
What is the best kale variety for Maryland winters?
Winterbor and Vates Blue Curled are excellent for overwintering. They tolerate temperatures down to 10°F. With protection, they survive most Maryland winters.
Final Tips For Success
Kale is one of the easiest vegetables to grow in Maryland. Start with the right timing and you’ll have a steady supply. Don’t forget to harvest regularly to encourage new growth.
If you miss the spring window, don’t worry. Fall planting often gives better results anyway. The cooler weather and frost make the leaves sweeter.
Keep a garden journal. Note your planting dates and weather patterns. Over time, you’ll learn the perfect timing for your specific location.
Remember to rotate your kale crops each year. This prevents soil-borne diseases. Plant kale in a different spot every season.
With a little planning, you can enjoy fresh kale from your Maryland garden for 8 to 10 months a year. That’s hard to beat for a homegrown vegetable.