When to plant butternut squash in Idaho

Sow outdoors in Boise City

May 1–May 15

Across Idaho the window opens between April 13 and May 19. Find your city below; the dates follow each town's own average last frost.

Sow outdoors 1–3 weeks after the last frost. Leave fruit on the vine until the skin is hard and the stem starts to dry.

Butternut squash planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost

JanFebMarAprMayJunJulAugSepOctNovDec

Boise CityMay 1–May 15

MeridianMay 1–May 15

NampaMay 6–May 20

CaldwellMay 6–May 20

Idaho FallsMay 16–May 30

PocatelloMay 9–May 23

Coeur d'AleneApr 29–May 13

Twin FallsMay 7–May 21

Post FallsApr 29–May 13

RexburgMay 19–Jun 2

LewistonApr 13–Apr 27

EagleMay 6–May 20

KunaMay 1–May 15

StarMay 6–May 20

AmmonMay 16–May 30

When should I plant butternut squash in Idaho?

In Boise City, sow outdoors from May 1 to May 15. Across Idaho the window opens between April 13 and May 19, depending on the local last frost.

How is this date worked out?

Sow outdoors 1–3 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.