FrostCal

When to Plant Garlic in Idaho

In a typical Idaho location, plant in fall Sep 16 – Sep 30. Across the state, the fall planting window starts as early as Aug 26 in Rexburg and as late as Sep 28 in Lewiston Orchards. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

Method Direct sow
Days to maturity 240–270 days

Fall-planted crop only; not planted in spring in most climates.

Garlic Planting Dates by City

CityFall planting
BoiseSep 23 – Oct 7
MeridianSep 23 – Oct 7
NampaSep 15 – Sep 29
Idaho FallsSep 3 – Sep 17
PocatelloSep 13 – Sep 27
CaldwellSep 20 – Oct 4
Coeur d'AleneSep 20 – Oct 4
Twin FallsSep 11 – Sep 25
LewistonSep 28 – Oct 12
Lewiston OrchardsSep 28 – Oct 12
Post FallsSep 20 – Oct 4
RexburgAug 26 – Sep 9
MoscowFrost-free: year-round planting
EagleSep 14 – Sep 28
CondaFrost-free: year-round planting
KunaSep 23 – Oct 7
AmmonSep 3 – Sep 17
ChubbuckSep 13 – Sep 27
HaydenSep 20 – Oct 4
Mountain HomeSep 10 – Sep 24
BlackfootSep 5 – Sep 19
Garden CitySep 23 – Oct 7
JeromeSep 16 – Sep 30
BurleySep 6 – Sep 20

Showing the 24 most populous of 24 Idaho cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Idaho cities.

Frequently Asked Questions

When should I plant garlic in Idaho?

In a typical Idaho location, plant in fall Sep 16 – Sep 30. Across the state, the fall planting window starts as early as Aug 26 in Rexburg and as late as Sep 28 in Lewiston Orchards. 2 cities in Idaho are essentially frost-free and can plant on a year-round schedule.

When is the last frost in Idaho?

The average last spring frost in Idaho ranges from April 6 in Lewiston to May 17 in Eagle, based on NOAA 1991–2020 climate normals.

How long do garlic take to grow?

Garlic typically take 240–270 days from planting to harvest. Fall-planted crop only; not planted in spring in most climates.

Other Crops in Idaho

When to plant garlic in other states

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