When to plant lemongrass in Montana
Montana spans USDA zones 4b–5b, so the right time to plant lemongrass shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 18 in Billings to June 27 in Butte-Silver Bow — below are local dates for 8 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Billings | 5a | May 4 | October 7 | May 18 – May 25 |
| Missoula | 5b | May 10 | October 1 | May 24 – May 31 |
| Great Falls | 4b | May 6 | October 1 | May 20 – May 27 |
| Bozeman | 5a | May 26 | September 22 | June 9 – June 16 |
| Butte-Silver Bow | 5a | June 13 | September 5 | June 27 – July 4 |
| Helena | 5a | May 9 | September 30 | May 23 – May 30 |
| Kalispell | 5b | May 31 | September 10 | June 14 – June 21 |
| Belgrade | 5a | May 26 | September 16 | June 9 – June 16 |
Lemongrass in Montana: FAQ
When can I plant lemongrass in Montana?
Across Montana, the time to transplant lemongrass spans roughly May 18 in Billings to June 27 in Butte-Silver Bow, each following that city's local frost dates.
Does the lemongrass planting date vary across Montana?
Yes. Montana publishes 8 cities with their own frost dates, so the right lemongrass 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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