When to plant Sweet potatoes in Idaho

In spring, from May 1 – June 1 in Lewiston to May 20 – June 10 in Twin Falls.

In fall, from May 20 – June 10 in Caldwell to June 1 – 15 in Rathdrum.

USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Sweet potatoes planting dates by place in Idaho
PlaceSpringFall
AmmonNot listedNot listed
BlackfootMay 20 – June 10Not listed
Boise CityMay 10 – June 10June 1 – 15
BurleyNot listedNot listed
CaldwellMay 20 – June 10May 20 – June 10
ChubbuckNot listedNot listed
Coeur d'AleneMay 10 – June 10June 1 – 15
EagleMay 20 – June 10June 1 – 15
Garden CityNot listedMay 20 – June 10
HaydenMay 10 – June 10June 1 – 15
Idaho FallsNot listedNot listed
JeromeMay 20 – June 10May 20 – June 10
KunaMay 10 – June 10June 1 – 15
LewistonMay 1 – June 1June 1 – 15
MeridianMay 10 – June 10June 1 – 15
MiddletonMay 20 – June 10May 20 – June 10
MoscowMay 20 – June 10Not listed
Mountain HomeMay 20 – June 10May 20 – June 10
NampaMay 20 – June 10May 20 – June 10
PocatelloMay 20 – June 10May 20 – June 10
Post FallsMay 10 – June 10June 1 – 15
RathdrumMay 10 – June 10June 1 – 15
RexburgNot listedNot listed
SandpointNot listedNot listed
StarMay 20 – June 10May 20 – June 10
Twin FallsMay 20 – June 10May 20 – June 10

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. The full USDA table for sweet potatoes.