Delaware · zones 7b–7b
When to plant kale in Delaware.
Sow or transplant between Mar 5 to Apr 2 in a typical year, keyed to Delaware's median last frost around Apr 12. A second, fall sowing fits Aug 1 to Sep 16. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Delaware season.
1 · Start indoors
Jan 22 to Feb 19
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 5 to Apr 2
Keyed to the ~Apr 12 last frost. Sow 0.25" deep, 16" apart.
Fall round
Aug 1 to Sep 16
Counted back from the ~Nov 1 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Delaware spans more than one climate: Zone 7 is the most common zone, but the state runs 7b 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.
In Delaware: watch for
The pests that find kale here.
A middle-length season, about 203 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: Delaware gives kale about 203 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 Delaware: questions
When should I plant kale in Delaware?+
In a typical Delaware year, sow kale or set out transplants between Mar 5 to Apr 2, keyed to the state's median last frost around Apr 12. There's also a fall window: Aug 1 to Sep 16. Your exact dates shift with your ZIP code and microclimate.
When do I start kale seeds indoors in Delaware?+
Start seeds inside about 6 weeks before set-out: roughly Jan 22 to Feb 19 for a typical Delaware season.
What USDA zone is Delaware?+
Delaware spans zones 7b–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.