When to plant winter squash in Idaho
Idaho spans USDA zones 5a–7a, so the right time to plant winter squash shifts by weeks across the state. The window to sow seed directly outdoors runs from about April 13 in Lewiston to May 24 in Garden City — below are local dates for 25 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Boise City | 7a | April 24 | October 21 | May 1 – May 15 |
| Meridian | 7a | April 24 | October 21 | May 1 – May 15 |
| Nampa | 7a | April 29 | October 13 | May 6 – May 20 |
| Idaho Falls | 5b | May 9 | October 1 | May 16 – May 30 |
| Caldwell | 7a | April 29 | October 13 | May 6 – May 20 |
| Pocatello | 6a | May 2 | October 11 | May 9 – May 23 |
| Coeur d'Alene | 6b | April 22 | October 18 | April 29 – May 13 |
| Twin Falls | 7a | April 30 | October 9 | May 7 – May 21 |
Winter Squash in Idaho: FAQ
When can I plant winter squash in Idaho?
Across Idaho, the time to direct-sow winter squash spans roughly April 13 in Lewiston to May 24 in Garden City, each following that city's local frost dates.
Does the winter squash planting date vary across Idaho?
Yes. Idaho publishes 25 cities with their own frost dates, so the right winter squash planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does winter squash take to grow in Idaho?
Winter Squash takes about 85–110 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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