When to plant sweet potatoes in Idaho

Plant out in Boise City

May 15–May 29

Across Idaho the window opens between April 27 and June 2. Find your city below; the dates follow each town's own average last frost.

Plant out 3–5 weeks after the last frost. Set out slips when the soil is warm, around 65°F. They need a long, hot season.

Sweet potatoes planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost

JanFebMarAprMayJunJulAugSepOctNovDec

Boise CityMay 15–May 29

MeridianMay 15–May 29

NampaMay 20–Jun 3

CaldwellMay 20–Jun 3

Idaho FallsMay 30–Jun 13

PocatelloMay 23–Jun 6

Coeur d'AleneMay 13–May 27

Twin FallsMay 21–Jun 4

Post FallsMay 13–May 27

RexburgJun 2–Jun 16

LewistonApr 27–May 11

EagleMay 20–Jun 3

KunaMay 15–May 29

StarMay 20–Jun 3

AmmonMay 30–Jun 13

In Rexburg the frost-free season is shorter than sweet potatoes need. Start plants indoors and pick early varieties.

When should I plant sweet potatoes in Idaho?

In Boise City, plant out from May 15 to May 29. Across Idaho the window opens between April 27 and June 2, depending on the local last frost.

How is this date worked out?

Plant out 3–5 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

Is the season long enough for sweet potatoes everywhere in Idaho?

Not quite. In Rexburg the frost-free season is shorter than the time sweet potatoes need to ripen. Start plants indoors and pick an early variety.