Maryland · zones 6b–7b
When to plant kale in Maryland.
Sow or transplant between Mar 1 to Mar 29 in a typical year, keyed to Maryland's median last frost around Apr 8. A second, fall sowing fits Aug 4 to Sep 19. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Maryland season.
1 · Start indoors
Jan 18 to Feb 15
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 1 to Mar 29
Keyed to the ~Apr 8 last frost. Sow 0.25" deep, 16" apart.
Fall round
Aug 4 to Sep 19
Counted back from the ~Nov 4 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Maryland spans more than one climate: Zone 7 is the most common zone, but the state runs 6b to 7b. That's why the planner works from your ZIP code's frost dates, not your zone: mountain and coastal gardens in the same state can be three weeks apart.
Maryland growing notes
Maryland kale gets better the longer you make it wait for frost.
Cold is not the enemy here, it is the flavor step
Kale is one of the few crops where a hard frost is a feature, not a risk. Cold temperatures trigger the plant to convert stored starches into sugars as a kind of natural antifreeze in its cells, and the practical result is that a leaf picked after the first frost in the mid 20s tastes noticeably sweeter and less bitter than the exact same leaf picked in October. Run the comparison yourself: pick one leaf before the first hard freeze and one after, and taste them side by side.
That makes fall the stronger of Maryland's two kale windows, even though spring works too. A fall-planted crop grows into cooling weather, sweetens as frost arrives, and in much of the state can keep producing pickable leaves well past the point a summer crop would have quit from heat and bolted. Set transplants 16 inches apart so the plant has room to fill out into the full 2-foot spread a well-fed Maryland kale plant can reach by late fall.
Two different soils, two different feeding plans
Maryland's Piedmont clay, running from Baltimore west toward the mountains, holds nutrients well but compacts easily under foot traffic, which matters for kale because its roots need to run 12 inches deep or more to support a plant that can stand 2 feet tall. Loosening the bed with a fork before transplanting, rather than just amending the top few inches, pays off for the whole season.
On the Eastern Shore's sandier, faster-draining ground, the concern flips to steady moisture and feeding rather than compaction. Kale mulched with 2 to 3 inches of straw there holds water through a dry stretch far better than bare sandy soil does, and cuts down on the splash-up that spreads soil-borne disease onto lower leaves. Harvest by the outer-leaf method on either soil: take only the largest lower leaves and leave the central growing bud untouched, and one plant keeps producing for months instead of getting cut down once.
Watching for the humid-summer trio
Cabbage worms and loopers, both pale green caterpillars that blend into kale leaves almost perfectly, are the most common damage Maryland gardeners see, showing up as ragged holes and small dark droppings on the underside of leaves. A weekly check of leaf undersides, followed by hand-picking or a Bt spray if numbers climb, keeps a light infestation from turning into a skeleton of a plant.
Flea beetles show up as a fine peppering of small round holes across young leaves, worst in the first few weeks after transplants go in, and Maryland's warm, humid early summer keeps them active longer than a drier climate would. Row cover over young transplants blocks the beetles at the exact stage the plant can least afford the damage; established plants shrug off flea beetle feeding with barely a mark. Aphids cluster in the tight new growth at the plant's center during humid stretches; a hard spray from the hose most mornings keeps a small colony from turning into a sticky, honeydew-coated mess.
In Maryland: watch for
The pests that find kale here.
A middle-length season, about 210 frost-free days, means kale overlaps cabbage worms & loopers for a stretch each summer. Check plants every week or two and treat early.
Green caterpillars chewing ragged holes; green droppings.
Organic fix: Handpick, cover with netting, spray Bt.
Gray-green clusters tucked into the leaf folds.
Organic fix: Blast with water, then insecticidal soap.
Tiny holes peppering the young leaves.
Organic fix: Row cover from day one; diatomaceous earth.
Black rot
Yellow V-shaped wedges cutting in from the leaf edge, veins blackening inside.
Organic fix: Pull infected plants, water at the base, keep brassicas out of that bed 3 years.
Seedlings wilt, yellow and stall for no reason; white maggots tunnel the roots.
Organic fix: Row cover before the flies are up, when yellow rocket blooms; rotate the bed.
Your season math: Maryland gives kale about 210 frost-free days, and it needs roughly 45 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting kale in Maryland: questions
When should I plant kale in Maryland?+
In a typical Maryland year, sow kale or set out transplants between Mar 1 to Mar 29, keyed to the state's median last frost around Apr 8. There's also a fall window: Aug 4 to Sep 19. Your exact dates shift with your ZIP code and microclimate.
When do I start kale seeds indoors in Maryland?+
Start seeds inside about 6 weeks before set-out: roughly Jan 18 to Feb 15 for a typical Maryland season.
What USDA zone is Maryland?+
Maryland spans zones 6b–7b, mostly zone 7. But frost dates, not zones, set planting time. The free planner uses your ZIP code's actual frost dates.
How many kale plants do I need?+
Depends who you're feeding. The crop page has exact counts per household size, or the free planner does the math for your family in about 60 seconds.