Indiana · zones 5b–6b
When to plant kale in Indiana.
Sow or transplant between Mar 15 to Apr 12 in a typical year, keyed to Indiana's median last frost around Apr 22. A second, fall sowing fits Jul 17 to Sep 1. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Kale dates for a typical Indiana season.
1 · Start indoors
Feb 1 to Mar 1
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Mar 15 to Apr 12
Keyed to the ~Apr 22 last frost. Sow 0.25" deep, 16" apart.
Fall round
Jul 17 to Sep 1
Counted back from the ~Oct 17 first frost.
Harvest
~45 days later
~2 lb per plant over ~16 weeks.
Indiana spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 6b. 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.
Indiana growing notes
A kale planting set here for fall keeps handing over leaves long after frost has shut down the rest of the garden, and the cold-touched leaves taste noticeably better than the ones picked before winter weather arrived.
Why fall is where this planting earns its keep
Kale goes into Indiana ground as a transplant spaced 16 inches apart and needs about 45 days to reach a first real cut, and unlike the quicker greens grown here it isn't staggered into repeat sowings. One planting per window is harvested leaf by leaf instead of pulled whole, since taking the outer leaves prompts fresh ones from the center rather than ending the plant's usefulness. A spring planting works, but Indiana's humid heat toughens the leaves and draws more pest pressure than cooler months do. A fall planting avoids that problem entirely, and it forgives a late start besides, since a crop picked leaf by leaf never stakes everything on one head.
The same crown gets better tasting the longer it stands in cooling weather. Pick a leaf in early fall before any real cold has hit, then pick another from that same plant after it has been through several frosts, and taste both side by side, raw or cooked. Most gardeners find the later leaf milder, without the sharper bitterness the plant carried a month earlier. Because kale keeps handing over new leaves rather than being harvested all at once, that improvement plays out across the planting's whole life, with leaves still worth picking long after frost would end a less hardy green.
Two insects that hide inside the leaf, one that hides at the top
Picking kale means handling nearly every leaf every few days, so the pest check works best folded into that routine, not treated as a separate walk through the bed. Turn each leaf before it goes in the basket and check the midrib and the point where the leaf meets the stem, the spots cabbage worms and loopers tuck into during daylight, since their green coloring blends into kale almost perfectly otherwise. A few small dark pellets caught in that crevice near the stem are the sign something is feeding above, even on a leaf that still looks whole from the top.
Cabbage aphids form dense, grayish, waxy-looking colonies nestled into the newest, still-curled leaves at the very center of the plant, easy to mistake for dirt until it's looked at closely enough to see it move. Flea beetles matter most in the first two or three weeks after the transplants go into the ground, punching small holes across leaves that don't have much size yet to absorb the damage. Once the plant is established and pushing full-size leaves, a little edge damage from flea beetles barely registers against the roughly 2 pounds a single plant gives up over a season of picking.
Black rot's V tells on the vein, a maggot works before any leaf shows it
Black rot starts at the edge of a leaf as a yellowing, V-shaped patch pointing back toward the midrib, and slicing across a vein inside that V usually shows it stained dark rather than the pale green of a healthy one. Because this crop is picked leaf by leaf rather than harvested as one head, a single infected leaf can just be pulled off and the rest of the planting kept in production, unlike a crop that stakes everything on one head.
Cabbage root maggot works underground before any of that shows on top: small white larvae chew at the roots below a transplant, which then wilts or grows stunted and faintly purple-tinged even though the bed has plenty of water, worth digging to confirm rather than guessing from the leaves alone. Fitting a snug collar around the base of each transplant at planting time, cardboard or a similar barrier pressed an inch or two into the soil, blocks the egg-laying fly before it ever reaches the root zone, cheap insurance on a planting that only gets set out once per window.
In Indiana: watch for
The pests that find kale here.
A middle-length season, about 178 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: Indiana gives kale about 178 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 Indiana: questions
When should I plant kale in Indiana?+
In a typical Indiana year, sow kale or set out transplants between Mar 15 to Apr 12, keyed to the state's median last frost around Apr 22. There's also a fall window: Jul 17 to Sep 1. Your exact dates shift with your ZIP code and microclimate.
When do I start kale seeds indoors in Indiana?+
Start seeds inside about 6 weeks before set-out: roughly Feb 1 to Mar 1 for a typical Indiana season.
What USDA zone is Indiana?+
Indiana spans zones 5b–6b, mostly zone 6. 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.