Indiana · zones 5b–6b
When to plant potatoes in Indiana.
Sow between Mar 15 to Apr 17 in a typical year, keyed to Indiana's median last frost around Apr 22. A second, fall sowing fits Jun 29 to Jul 12. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Indiana season.
Direct sow
Mar 15 to Apr 17
Keyed to the ~Apr 22 last frost. Sow 4" deep, 12" apart.
Fall round
Jun 29 to Jul 12
Counted back from the ~Oct 17 first frost.
Harvest
~90 days later
~3 lb per plant over ~1 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 potato seed piece goes four inches down into Indiana ground that, in the state's heavier till soil, can hold water at exactly the depth where a tuber is trying to grow.
Depth, drainage, and a crop grown entirely out of sight
Potato is planted from seed pieces set a full 4 inches deep, deeper than almost anything else grown here, at about 12 inches between plants, and needs roughly 90 days to bulk up a harvest that typically runs close to 3 pounds per plant. Every bit of that harvest forms below the soil surface, which makes drainage a bigger issue for potatoes than for a crop that only roots there. Indiana's glacial till in the north is dense and slow to drain; water that a leafy crop's roots might sit through for a day can pool right at seed-piece depth around a developing tuber, cutting off the oxygen it needs while it's sizing up.
The test doesn't require guessing: dig a hole about a foot deep in the bed a day after a heavy rain. Ground that's still holding standing water rather than damp at that depth is slow-draining, and that kind of soil is better hilled into a raised ridge above grade than planted flat, keeping the seed piece and tubers above the water instead of in it. The looser river-bottom silt common farther south drains faster on its own and needs less of that extra hilling.
Two windows, one planting each
Potatoes get both a spring and a fall window here, but each window here gets exactly one planting rather than a string of sowings through the season. Spring is the standard approach and gives the crop its full 90 days. A fall crop asks more of the timing: seed pieces go in during summer heat that potatoes don't care for, then have to bulk up a harvest before frost closes out the season, which favors an early-maturing variety with less than the full 90 days to spare rather than a slower one.
Either way, the harvest signal is the plant itself, not a date: foliage yellowing and dying back on its own means the tubers below have stopped sizing up and are ready to dig, or can be left a little longer under mulch for a slightly tougher skin that stores better. Digging while the vines are still green and dark cuts the harvest short before the plant has finished its work.
One beetle worth learning at every life stage
Colorado potato beetle is the pest that costs Indiana growers the most, and it's worth knowing in all three of its damaging forms, not just the adult. The adult is a rounded, hard-shelled beetle with cream and black stripes down its back, easy to spot but not the main threat. The real damage comes from the soft, hump-backed, orange-red larvae with two rows of black spots down each side that hatch from clusters of bright yellow-orange eggs laid on leaf undersides. A single missed egg cluster can turn into a dozen larvae stripping a plant's leaves within days, so checking leaf undersides through the first weeks after plants emerge matters more than watching for the adult alone.
Aphids show up on new growth same as most crops here, curling leaves and leaving a sticky residue that draws ants. Late blight is the one to move fastest on: leaves develop dark, greasy blotches that can take down a planting within days during a cool, wet week, and the underside of an affected leaf often shows a thin ring of white mold right at the edge of the dead tissue by early morning, before the sun burns it off. Because the same water mold infects the tubers underground as well as the leaves, a planting that shows late blight on top is worth digging a few test tubers from, checking each for the reddish-brown dry rot it causes beneath the skin before deciding whether the rest of the crop is worth storing.
In Indiana: watch for
The pests that find potatoes here.
A middle-length season, about 178 frost-free days, means potato overlaps colorado potato beetle for a stretch each summer. Check plants every week or two and treat early.
Striped beetles and orange grubs eating the leaves.
Organic fix: Handpick adults, crush the orange egg clusters, dust with diatomaceous earth.
Dark greasy blotches after cool, wet spells.
Organic fix: Pull infected plants fast, keep leaves dry, use neem as a preventive.
Common scab
Rough, corky patches on the skin, raised on some tubers and sunk into pits on others.
Organic fix: Keep the bed evenly moist through the weeks right after tubers set, rotate away from potatoes, and pick a scab-resistant variety next time.
Your season math: Indiana gives potatoes about 178 frost-free days, and it needs roughly 90 days to a first harvest. It's a one-planting crop, so time that single sowing well.
Planting potatoes in Indiana: questions
When should I plant potatoes in Indiana?+
In a typical Indiana year, sow potatoes between Mar 15 to Apr 17, keyed to the state's median last frost around Apr 22. There's also a fall window: Jun 29 to Jul 12. Your exact dates shift with your ZIP code and microclimate.
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 potatoes 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.