When to plant garlic in Idaho
Idaho spans USDA zones 5a–7a, so the right time to plant garlic shifts by weeks across the state. The window to plant for fall/overwintering runs from about August 27 in Rexburg to September 28 in Lewiston — below are local dates for 25 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Fall-plant |
|---|---|---|---|---|
| Boise City | 7a | April 24 | October 21 | September 23 – October 7 |
| Meridian | 7a | April 24 | October 21 | September 23 – October 7 |
| Nampa | 7a | April 29 | October 13 | September 15 – September 29 |
| Idaho Falls | 5b | May 9 | October 1 | September 3 – September 17 |
| Caldwell | 7a | April 29 | October 13 | September 15 – September 29 |
| Pocatello | 6a | May 2 | October 11 | September 13 – September 27 |
| Coeur d'Alene | 6b | April 22 | October 18 | September 20 – October 4 |
| Twin Falls | 7a | April 30 | October 9 | September 11 – September 25 |
Garlic in Idaho: FAQ
When can I plant garlic in Idaho?
Across Idaho, the time to fall-plant garlic spans roughly August 27 in Rexburg to September 28 in Lewiston, each following that city's local frost dates.
Does the garlic planting date vary across Idaho?
Yes. Idaho publishes 25 cities with their own frost dates, so the right garlic planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
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