Kansas · zones 5b–7a
When to plant potatoes in Kansas.
Sow between Mar 7 to Apr 9 in a typical year, keyed to Kansas's median last frost around Apr 14. A second, fall sowing fits Jul 4 to Jul 17. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Kansas season.
Direct sow
Mar 7 to Apr 9
Keyed to the ~Apr 14 last frost. Sow 4" deep, 12" apart.
Fall round
Jul 4 to Jul 17
Counted back from the ~Oct 22 first frost.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
Kansas spans more than one climate: Zone 6 is the most common zone, but the state runs 5b to 7a. 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.
Kansas growing notes
Kansas potatoes need help fighting the ground's own chemistry.
Alkaline soil raises scab risk here more than most places
Common scab, the rough, corky patches that show up on a potato's skin without hurting the flesh underneath, is suppressed naturally in soil that runs acidic, at a pH of 5.2 or below, and a lot of Kansas ground, particularly the alkaline, limestone-influenced soils common across the western half of the state, sits well above that line. That gap is why scab shows up on Kansas-grown potatoes more often than the same varieties grown in acidic eastern soils, even when watering and spacing are identical.
There is no quick fix for garden-scale soil pH, but there is a workaround: plant a scab-tolerant variety like Superior or Dark Red Norland rather than betting on an amendment, since resistance bred into the variety holds up consistently across university trials in a way not every so-called scab-tolerant release does, and keep the seed piece evenly moist through tuber formation, since scab also worsens in ground that swings between dry and wet during that window regardless of pH.
Rocky Flint Hills ground wants a raised row
Shallow, rocky soil over limestone bedrock, the kind common through the Flint Hills and other parts of eastern Kansas, stops a developing tuber from expanding the way it would in deep, loose ground, producing small, oddly shaped potatoes even from a healthy plant. Hilling soil up around the stems twice during the season, once at about 6 inches of top growth and again a few weeks later, builds a deeper loose zone above the native rock line for tubers to swell into.
A raised bed or simply a wide, built-up row solves the same problem for a gardener who does not want to fight rock with a shovel every spring; either approach gives roots and tubers more loose depth to work with regardless of what sits underneath. Potatoes planted into unmodified rocky ground still produce, they just tend to run smaller and more irregular than the same seed piece would in a built-up row.
Colorado potato beetle on a Kansas timeline
Colorado potato beetle overwinters as an adult in Kansas garden soil and emerges within days of the season's first real warm stretch, well ahead of most other potato pests, so the first scouting pass should happen the same week plants emerge rather than waiting for visible damage. Yellow-orange egg clusters on the underside of leaves hatch into humpbacked red larvae within about a week, and a patch left unchecked for two weeks can lose real leaf area fast.
A multi-year break from planting potatoes, tomatoes, or peppers in the same bed cuts the local population sharply, since the beetle overwinters within a few feet of where it fed last season and has limited range to find a new host on its own. Hand-picking adults and crushing egg clusters through the first month after emergence usually keeps a home patch under control before the population crosses roughly 2 larvae per plant averaged across a row, the point worth treating.
In Kansas: watch for
The pests that find potatoes here.
A middle-length season, about 191 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: Kansas gives potatoes about 191 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 Kansas: questions
When should I plant potatoes in Kansas?+
In a typical Kansas year, sow potatoes between Mar 7 to Apr 9, keyed to the state's median last frost around Apr 14. There's also a fall window: Jul 4 to Jul 17. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Kansas?+
Kansas spans zones 5b–7a, 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.