Utah · zones 6a–8b
When to plant potatoes in Utah.
Sow between Mar 24 to Apr 26 in a typical year, keyed to Utah's median last frost around May 1. A second, fall sowing fits Jun 17 to Jun 30. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical Utah season.
Direct sow
Mar 24 to Apr 26
Keyed to the ~May 1 last frost. Sow 4" deep, 12" apart.
Fall round
Jun 17 to Jun 30
Counted back from the ~Oct 5 first frost.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
Utah spans more than one climate: Zone 6 is the most common zone, but the state runs 6a to 8b. 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.
Utah growing notes
Potatoes forgive a lot in Utah. Uneven water is not one of them.
Sizing tubers on a turn-based watering schedule
Utah's mix of Wasatch Front sandy loam and heavier Cache Valley ground both grow good potatoes, but both get punished by the state's common irrigation pattern, a scheduled turn every several days rather than water on demand. Potatoes forming tubers on an inconsistent schedule develop hollow heart, a dark cavity inside the tuber invisible until you cut into it, or knobby secondary growth where a dry stretch was followed by a heavy soak.
The fix is to treat the 6 weeks after hilling as non-negotiable: roughly 2 inches of water a week, and if the household's turn only comes once a week, that means a full, slow soak rather than a quick pass, deep enough that a shovel pushed 8 inches down still finds damp soil the day before the next turn arrives.
The beetle that outlasts every rotation
Colorado potato beetle has spread well beyond its namesake state and is now a standing pest across northern Utah's potato patches, overwintering as an adult in garden soil and emerging within days of the first warm week of the season. A 3-year rotation away from any spot that grew potatoes, tomatoes, or peppers cuts the population sharply, since the beetle has no way to travel far on its own to find a new host.
Scout twice a week starting as soon as plants emerge: yellow-orange egg clusters on the underside of leaves, usually two to three dozen eggs per cluster, hatch into humpbacked larvae within a week, and a single missed cluster can defoliate a plant before the next check. Crushing eggs and hand-picking adults into soapy water controls most home patches without a single application of pesticide.
Norkotah, Sangre, and Utah's salty ground
Russet Norkotah, released in 1987 by North Dakota State University working with USDA-ARS breeders and now one of the most widely grown russets across the whole West, and Sangre, a red-skinned variety that tolerates alkaline soil well, both outperform grocery-store stock in Utah gardens, especially on ground irrigated with canal water for years that carries some accumulated salt. Potatoes handle moderate soil salinity better than onions or beans do, which makes them a reasonable crop to rotate into a bed that has started showing a white surface crust.
Hill soil around the stems twice during the growing season, both to bury developing tubers against this state's intense summer sun, which greens any exposed potato within days, and to bury weed seedlings before they compete for the same limited irrigation turn. A hilled row also sheds a heavy monsoon downpour instead of pooling water against the stems.
In Utah: watch for
The pests that find potatoes here.
A middle-length season, about 157 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: Utah gives potatoes about 157 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 Utah: questions
When should I plant potatoes in Utah?+
In a typical Utah year, sow potatoes between Mar 24 to Apr 26, keyed to the state's median last frost around May 1. There's also a fall window: Jun 17 to Jun 30. Your exact dates shift with your ZIP code and microclimate.
What USDA zone is Utah?+
Utah spans zones 6a–8b, 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.