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Vegetable Crop Calendars (A–C)Potato Planting Calendar by Zone
Zone maps do not tell you when to plant potatoes. They describe winter cold, while planting depends on frost dates and how fast your soil dries and warms.
Key points
- Hardiness zones are not planting dates; use frost dates and soil conditions.
- Use certified seed potatoes and let cut pieces toughen for two to three days.
- Plant shallow enough for quick emergence, then hill to keep tubers covered.
- Closer spacing gives more, smaller tubers.
Can you plant potatoes by hardiness zone?
Not directly. The USDA Plant Hardiness Zone Map reflects average annual extreme winter minimum temperature. It does not give frost dates or planting dates, so two gardens in the same zone can plant weeks apart.
Use your zone as a loose guide to climate type, then pin down your date with your average last spring frost and a soil check. Your local weather service or county extension office can give you frost date data.
Another way to anchor the date is the traditional cue Kansas State mentions. Local cues like that are useful, but verify them against the actual soil and forecast in your own year.
When do potatoes go in the ground?
Kansas State Extension says to plant from mid to late March in Kansas, with St. Patrick's Day as the traditional cue, and notes emergence is slow, often not showing until mid to late April. Utah State Extension reports planting often begins in late March in southern Utah and can run to early June in cooler northern areas, after frost danger has passed.
Those two examples are a reminder that the window is regional. Both sources lean on local conditions, and the Utah page points readers to the Utah Climate Center for local freeze dates.
If your soil is still frozen or wet in the cool weeks of early spring, you can chit seed potatoes, meaning set them in light at room temperature until short sturdy sprouts form. It speeds emergence once planted, though it is optional.
How do you prepare seed potatoes?
Kansas State advises buying certified disease-free seed potatoes rather than grocery store potatoes. Cut larger tubers into pieces of roughly one and a half to two ounces, each with more than one eye, and cut them two to three days before planting so the cut surface toughens.
Keep cut pieces in a warm spot with some air movement during that curing period. Small whole seed potatoes need no cutting at all.
For example, if your last spring frost usually falls in mid-April, you might plan to plant a few weeks earlier only if the soil is workable and not soggy, accepting that shoots can be frosted back.
How deep and how far apart?
Kansas State suggests pieces planted one to two inches deep and 8 to 12 inches apart in rows. Utah State recommends two to four inches deep, with shallower planting speeding emergence, and a bit deeper if soil is dry.
Close spacing gives more but smaller tubers, according to Utah State, and can reduce problems like hollow heart. Choose spacing by whether you want baby potatoes or larger bakers.
Dry soil calls for slightly deeper planting, as Utah State notes. Wet soil calls for patience instead.
Why do you hill potatoes?
Kansas State points out that tubers exposed to light turn green and develop solanine, a toxic compound. Mound soil around plants as they grow so developing tubers stay covered.
Discard green portions and do not eat green tubers. Store harvested potatoes in the dark, cool and dry.
Rotate potatoes with non-related crops. Planting them where tomatoes, peppers or eggplant grew can encourage shared diseases.
What can go wrong?
Planting into cold, wet soil can rot seed pieces, and a late frost can nip emerged foliage, which usually regrows if the damage is limited. Blight and beetle pressure vary by region.
Ask your county extension office for current disease and insect recommendations, follow any label exactly, honor pre-harvest intervals, and protect pollinators.
Harvest is not covered by the sources here, but many growers wait until vines die back and let tubers cure briefly before storing. Ask your extension office for local storage advice and, for processed potatoes, use tested procedures from the National Center for Home Food Preservation.
How do you set a potato date in six steps?
Zones help with variety choice and storage planning, but dates come from your own site. A short routine makes the date concrete.
Work through these steps in late winter:
- Look up your average last spring frost with your local weather service.
- Check whether soil is workable, not waterlogged.
- Order certified seed potatoes early so they arrive in time.
- Cut large tubers two to three days before planting.
- Plant at the depth and spacing your goal suggests.
- Hill as shoots grow so tubers stay covered.
Timing at a glance
| Item | Window | Caveat |
|---|---|---|
| Potatoes, Kansas | Mid to late March, with shoots often appearing mid to late April | Kansas State guidance; adjust for your own frost dates and soil. |
| Potatoes, Utah | Late March in southern Utah to as late as early June in cooler northern areas | Plant after frost danger has passed; check Utah freeze date data for your location. |
Sources and further reading
Last reviewed: November 2026. Educational information, ranges only. Confirm timing with your county extension office.