Zone 4 Coverage
Planting Timeline — All Varieties
Growing Brassicas in Zone 4
Zone 4's short but intense growing season is actually a blessing for brassica lovers. The cool spring and fall temperatures that define this climate zone create perfect conditions for these cold-weather crops, while the shorter summer heat period means less bolting stress on your plants. Your main challenge isn't the cold – it's maximizing that precious 135-day window between frosts to get multiple harvests.
When selecting brassicas for Zone 4, prioritize varieties with shorter maturity dates and excellent cold tolerance. Look for cultivars that can handle temperature swings and won't panic-bolt during unexpected warm spells in late spring. The varieties listed here have been selected specifically for their ability to thrive in your climate zone, offering reliable harvests even when Mother Nature doesn't cooperate. From ultra-hardy kales that sweeten after frost to quick-maturing cabbages that beat the fall freeze, these picks will keep your table supplied with fresh brassicas from late spring through early winter.
Variety Comparison
| Variety ↑ | Days | Difficulty | Size | Type | Indoor | Harvest |
|---|---|---|---|---|---|---|
| Arugula 'Rocket' | 20-40 | Very Easy | 2-4 inch leaves when harvested young | Heirloom | — | May–October |
| Black Magic Kale | 55-65 | Easy | 10-12 inch leaves | Hybrid | March–July | June–November |
| Bright Lights Swiss Chard | 55-60 | Easy | 12-18 inch leaves | Hybrid | — | July–September |
| Brussels Sprouts 'Long Island Improved' | 100-120 | Moderate | 1-2 inches diameter | Heirloom | May–June | September–November |
| De Cicco Broccoli | 48-85 | Easy to moderate | 3-4 inch main heads, 1-2 inch side shoots | Heirloom | March–April | June–November |
| Detroit Dark Red | 100-110 | Easy | 3-5 lbs | Heirloom | — | — |
| Early Jersey Wakefield Cabbage | 63-75 | Easy | 2-3 pound heads | Heirloom | March–April | June–September |
| Golden Acre Cabbage | 65-75 | Easy | 3-5 lbs, 6-7 inches diameter | Heirloom | March–July | June–October |
| Kohlrabi 'Early White Vienna' | 55-65 | Easy | 2-4 inches diameter when harvested | Heirloom | March–August | June–October |
| Lacinato Kale | 60-90 | Easy | Individual leaves 10-18 inches long | Heirloom | — | June–December |
| Napa Cabbage 'Michihili' | 65-75 | Easy | 12-16 inches tall, 4-6 inches diameter | Heirloom | March–April | August–October |
| Premium Crop Broccoli | 82-85 | Moderate | 6-8 inch diameter heads | Hybrid | March–April | July–October |
| Purple Top Turnip | 55-60 | Easy | 3-4 inches diameter | Heirloom | — | June–October |
| Red Russian Kale | 50-65 | Easy | 8-12 inch leaves | Heirloom | March–April | June–November |
| Romanesco | 75-100 | Moderate to challenging | 6-8 inches diameter, 2-3 lbs | Heirloom | March–July | July–November |
| Ruby Perfection Cabbage | 76-85 | Moderate | 3-4 pound heads | Hybrid | March–April | July–September |
| Snowball Y Improved Cauliflower | 68-75 | Moderate | 6-8 inches diameter | Hybrid | March–July | July–October |
| Watermelon Radish | 60-70 | Easy | 3-4 inches diameter | Heirloom | — | September–October |
| White Hot Cauliflower | 68-75 | Moderate to challenging | 6-8 inch diameter heads | Hybrid | March–July | July–October |
Variety Details
Arugula 'Rocket'
This fast-growing salad green delivers a peppery, nutty punch that transforms ordinary salads into gourmet experiences. The deeply lobed leaves are ready to harvest in just weeks, making it perfect for succession planting and continuous fresh salads. Cool weather brings out the best flavor, while hot weather intensifies the spiciness for those who love bold, peppery greens.
Black Magic Kale
A stunning hybrid kale with deeply savoyed, dark blue-green leaves that are both ornamental and delicious. This cold-hardy variety produces tender, sweet leaves that become even more flavorful after frost exposure. Perfect for gardeners who want both beauty and taste in their vegetable garden.
Bright Lights Swiss Chard
An award-winning rainbow of colorful stems in brilliant reds, oranges, yellows, pinks, and whites that make this chard as ornamental as it is delicious. This All-America Selections winner produces tender, mild-flavored leaves continuously throughout the growing season and adds stunning color to both the garden and the dinner plate. It's heat tolerant and virtually bolt-resistant, making it perfect for summer growing.
Brussels Sprouts 'Long Island Improved'
A reliable heirloom Brussels sprouts variety that produces abundant harvests of sweet, compact sprouts along tall, sturdy stalks. This cold-hardy variety actually improves in flavor after frost, developing a nutty sweetness that makes it perfect for roasting. An excellent choice for gardeners wanting to grow their own fresh Brussels sprouts without the bitterness often found in store-bought varieties.
De Cicco Broccoli
An exceptional Italian heirloom broccoli that keeps on giving throughout the growing season with continuous side shoot production after the main head is harvested. This variety is perfectly sized for home gardens, producing tender, flavorful heads that are ideal for fresh eating and never get too large or tough. The ultimate cut-and-come-again broccoli for extended harvests.
Detroit Dark Red
A classic heirloom cabbage prized for its deep burgundy-red color and exceptional storage capabilities. This reliable variety produces dense, round heads with crisp texture and sweet flavor that intensifies after light frosts. Perfect for both fresh eating and traditional fermented preparations like sauerkraut.
Early Jersey Wakefield Cabbage
A treasured heirloom dating back to the 1840s, this variety produces compact, conical heads that are perfect for small gardens and early harvests. Known for its sweet, tender leaves and reliable performance, it's an excellent choice for gardeners wanting to try a piece of American agricultural history. The pointed heads are distinctively attractive and space-efficient.
Golden Acre Cabbage
A compact, early-maturing cabbage that's perfect for small gardens and beginning gardeners seeking reliable results. This variety produces perfectly round, solid heads with sweet, crisp leaves and has the advantage of maturing quickly without taking up excessive garden space. An excellent choice for succession planting and container growing.
Kohlrabi 'Early White Vienna'
This unique vegetable produces crisp, sweet bulbs that taste like a cross between cabbage and turnip, with a delightful apple-like crunch. The pale green bulbs are best harvested young and tender, offering a refreshing addition to salads or excellent roasted as a side dish. Easy to grow and fast-maturing, this heirloom variety is perfect for gardeners wanting to try something new and delicious.
Lacinato Kale
Also known as 'Dinosaur Kale' or 'Tuscan Kale', this Italian heirloom features distinctive dark blue-green leaves with a pebbled texture resembling reptilian skin. The narrow, strap-like leaves have a sweeter, more tender flavor than curly kale and become incredibly sweet after frost exposure. An absolute must-have for the health-conscious gardener seeking both nutrition and gourmet flavor.
Napa Cabbage 'Michihili'
This classic Chinese cabbage produces tall, cylindrical heads with tender, sweet leaves perfect for Asian cuisine and fresh salads. The pale green leaves have crisp white ribs and a delicate flavor that's much milder than regular cabbage. Fast-growing and heat-tolerant, 'Michihili' is ideal for gardeners wanting to add authentic Asian vegetables to their garden repertoire.
Premium Crop Broccoli
An award-winning F1 hybrid that produces large, dense blue-green heads with exceptional flavor and texture. This reliable variety offers excellent heat tolerance and produces abundant side shoots after the main head is harvested. A favorite among both home gardeners and commercial growers for its consistent performance.
Purple Top Turnip
A classic dual-purpose turnip that's been a garden staple for generations. The sweet, crisp white roots with distinctive purple shoulders are perfect for roasting or mashing, while the tender greens provide nutritious early spring and fall harvests. This reliable variety thrives in cool weather and actually sweetens after light frosts.
Red Russian Kale
An exceptionally beautiful and cold-hardy heirloom kale with deeply lobed blue-green leaves and stunning purple stems and veins. Originally from Siberia, this variety can survive temperatures down to 20°F and actually becomes sweeter after frost exposure. The tender leaves have a mild, sweet flavor that's perfect for both raw and cooked applications.
Romanesco
An extraordinary Italian heirloom that's part cauliflower, part broccoli, and completely mesmerizing with its mathematical spiral fractal patterns. This stunning brassica offers a unique nutty, sweet flavor that's milder than broccoli and more complex than cauliflower. A true conversation starter that brings both beauty and gourmet flavor to the garden table.
Ruby Perfection Cabbage
A stunning F1 hybrid that produces perfectly round, deep purple-red heads that are as beautiful as they are delicious. This variety offers excellent holding ability in the field and superior flavor compared to many red cabbages. The vibrant color intensifies with cool weather, making it a showstopper in both the garden and on the dinner table.
Snowball Y Improved Cauliflower
The gold standard for home gardeners seeking reliable, pure white cauliflower heads with exceptional flavor and texture. This improved variety produces dense, creamy white 6-8 inch heads that hold their quality longer than older varieties and resist yellowing. It's more heat tolerant than traditional Snowball types while maintaining that classic sweet, nutty cauliflower taste.
Watermelon Radish
A stunning Chinese heirloom radish that's white on the outside but reveals a brilliant magenta interior when sliced, resembling a watermelon. These large, mild radishes are perfect for adding dramatic color to salads and have a sweet, crisp texture that's nothing like the sharp bite of spring radishes. They're a showstopper at farmers markets and dinner parties alike.
White Hot Cauliflower
A heat-tolerant F1 hybrid that produces pure white, dense heads even in challenging summer conditions where other cauliflowers fail. This variety is perfect for gardeners in warmer climates or those wanting extended harvest seasons. The self-blanching heads stay white without tying, making it both beautiful and low-maintenance.
Zone 4 Growing Tips
Start your spring brassica seeds indoors 6-8 weeks before your last frost date (so early to mid-March for Zone 4). This gives you transplants ready to go out in mid to late April when soil can be worked. Don't worry about light frosts – most brassicas can handle temperatures down to 28°F once established. For fall crops, start seeds in mid-June to early July for transplanting in August, giving them time to mature before hard frosts arrive.
Succession planting is crucial in Zone 4's compressed season. Start new rounds of quick-maturing crops like arugula and radishes every 2-3 weeks through summer. Use row covers or cold frames to extend both ends of the season – I've harvested kale and Brussels sprouts well into November this way. Pay attention to soil temperature too; brassicas prefer soil temps between 60-65°F for germination, so consider using black plastic mulch in early spring to warm beds faster.
Season Overview
With your last frost around May 10th and first frost around September 25th, you're working with about 18-19 weeks of growing season. This timing actually works beautifully for brassicas since you can grow spring crops through June, then transition directly to fall plantings without the scorching heat that plagues southern zones. Plan your spring brassicas to mature by late June, then use July and August to establish fall crops that will thrive in September's cooling temperatures and often continue producing after first frost with minimal protection.