When to plant cucumbers in Idaho

Cucumbers
Plant out in Boise City
May 8–May 15

Across Idaho the window opens between April 20 and May 26. Find your city below; the dates follow each town's own average last frost.

Start indoors, Boise City
Mar 27–Apr 3
Plant out, Boise City
May 8–May 15
Sow outdoors, Boise City
May 1–May 15
Last sowing for a harvest
Jul 29
Last frost, Boise City
Apr 24

Start seeds indoors 3–4 weeks before the last frost; plant out 2–3 weeks after the last frost; sow outdoors 1–3 weeks after the last frost. Cucumbers rot in cold soil. Sow when the soil is at least 65°F.

Cucumbers planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
Boise CityMay 8–May 15
MeridianMay 8–May 15
NampaMay 13–May 20
CaldwellMay 13–May 20
Idaho FallsMay 23–May 30
PocatelloMay 16–May 23
Coeur d'AleneMay 6–May 13
Twin FallsMay 14–May 21
Post FallsMay 6–May 13
RexburgMay 26–Jun 2
LewistonApr 20–Apr 27
EagleMay 13–May 20
KunaMay 8–May 15
StarMay 13–May 20
AmmonMay 23–May 30

Questions

When should I plant cucumbers in Idaho?

In Boise City, plant out from May 8 to May 15. Across Idaho the window opens between April 20 and May 26, depending on the local last frost.

How is this date worked out?

Start seeds indoors 3–4 weeks before the last frost; plant out 2–3 weeks after the last frost; sow outdoors 1–3 weeks after the last frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Idaho

Cucumbers in other states

Frost dates for every city in Idaho