When to plant sweet potato in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 5 in Grand Junction to July 12 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 25 – June 8 |
| Colorado Springs | 6a | May 3 | October 8 | May 24 – June 7 |
| Aurora | 6a | May 7 | October 8 | May 28 – June 11 |
| Fort Collins | 5b | May 2 | October 7 | May 23 – June 6 |
| Lakewood | 6a | May 3 | October 7 | May 24 – June 7 |
| Thornton | 6a | May 2 | October 11 | May 23 – June 6 |
| Arvada | 6a | May 5 | October 5 | May 26 – June 9 |
| Westminster | 6a | May 2 | October 11 | May 23 – June 6 |
Sweet Potato in Colorado: FAQ
When can I plant sweet potato in Colorado?
Across Colorado, the time to transplant sweet potato spans roughly May 5 in Grand Junction to July 12 in Edwards, each following that city's local frost dates.
Does the sweet potato planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right sweet 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 sweet potato take to grow in Colorado?
Sweet Potato takes about 90–120 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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