When to plant rhubarb in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant rhubarb shifts by weeks across the state. The window to transplant seedlings outdoors runs from about March 3 in Grand Junction to May 10 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 | March 23 – April 20 |
| Colorado Springs | 6a | May 3 | October 8 | March 22 – April 19 |
| Aurora | 6a | May 7 | October 8 | March 26 – April 23 |
| Fort Collins | 5b | May 2 | October 7 | March 21 – April 18 |
| Lakewood | 6a | May 3 | October 7 | March 22 – April 19 |
| Thornton | 6a | May 2 | October 11 | March 21 – April 18 |
| Arvada | 6a | May 5 | October 5 | March 24 – April 21 |
| Westminster | 6a | May 2 | October 11 | March 21 – April 18 |
Rhubarb in Colorado: FAQ
When can I plant rhubarb in Colorado?
Across Colorado, the time to transplant rhubarb spans roughly March 3 in Grand Junction to May 10 in Edwards, each following that city's local frost dates.
Does the rhubarb planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right rhubarb 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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