When to plant lemon balm in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant lemon balm shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 14 in Grand Junction to June 21 in Edwards — below are local dates for 70 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Denver | 6a | May 4 | October 8 | May 4 – May 18 |
| Colorado Springs | 6a | May 3 | October 8 | May 3 – May 17 |
| Aurora | 6a | May 7 | October 8 | May 7 – May 21 |
| Fort Collins | 5b | May 2 | October 7 | May 2 – May 16 |
| Lakewood | 6a | May 3 | October 7 | May 3 – May 17 |
| Thornton | 6a | May 2 | October 11 | May 2 – May 16 |
| Arvada | 6a | May 5 | October 5 | May 5 – May 19 |
| Westminster | 6a | May 2 | October 11 | May 2 – May 16 |
Lemon Balm in Colorado: FAQ
When can I plant lemon balm in Colorado?
Across Colorado, the time to transplant lemon balm spans roughly April 14 in Grand Junction to June 21 in Edwards, each following that city's local frost dates.
Does the lemon balm planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right lemon balm 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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