When to plant potato in Montana
Montana spans USDA zones 4b–5b, so the right time to plant potato shifts by weeks across the state. The window to sow seed directly outdoors runs from about April 6 in Billings to May 16 in Butte-Silver Bow — below are local dates for 8 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Billings | 5a | May 4 | October 7 | April 6 – April 20 |
| Missoula | 5b | May 10 | October 1 | April 12 – April 26 |
| Great Falls | 4b | May 6 | October 1 | April 8 – April 22 |
| Bozeman | 5a | May 26 | September 22 | April 28 – May 12 |
| Butte-Silver Bow | 5a | June 13 | September 5 | May 16 – May 30 |
| Helena | 5a | May 9 | September 30 | April 11 – April 25 |
| Kalispell | 5b | May 31 | September 10 | May 3 – May 17 |
| Belgrade | 5a | May 26 | September 16 | April 28 – May 12 |
Potato in Montana: FAQ
When can I plant potato in Montana?
Across Montana, the time to direct-sow potato spans roughly April 6 in Billings to May 16 in Butte-Silver Bow, each following that city's local frost dates.
Does the potato planting date vary across Montana?
Yes. Montana publishes 8 cities with their own frost dates, so the right potato 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 potato take to grow in Montana?
Potato takes about 70–120 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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