When to plant garlic in Idaho

Garlic
Fall planting in Boise City
Sep 30–Nov 4

Across Idaho the window opens between September 3 and October 5. Find your city below; the dates follow each town's own average first fall frost.

Fall planting, Boise City
Sep 30–Nov 4
Last frost, Boise City
Apr 24

Plant cloves from 3 weeks before to 2 weeks after the first fall frost. Plant cloves pointy end up, about 2 inches deep. Roots grow before the ground freezes and leaves come up in spring.

Garlic planting dates by city

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
JanFebMarAprMayJunJulAugSepOctNovDec
Boise CitySep 30–Nov 4
MeridianSep 30–Nov 4
NampaSep 22–Oct 27
CaldwellSep 22–Oct 27
Idaho FallsSep 10–Oct 15
PocatelloSep 20–Oct 25
Coeur d'AleneSep 27–Nov 1
Twin FallsSep 18–Oct 23
Post FallsSep 27–Nov 1
RexburgSep 3–Oct 8
LewistonOct 5–Nov 9
EagleSep 22–Oct 27
KunaSep 30–Nov 4
StarSep 22–Oct 27
AmmonSep 10–Oct 15

Questions

When should I plant garlic in Idaho?

In Boise City, fall planting from September 30 to November 4. Across Idaho the window opens between September 3 and October 5, depending on the local last frost.

How is this date worked out?

Plant cloves from 3 weeks before to 2 weeks after the first fall frost. Frost dates are NOAA 1991–2020 averages for the weather station nearest each city.

More for Idaho

Garlic in other states

Frost dates for every city in Idaho