When to plant yardlong bean in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant yardlong bean shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 28 in Grand Junction to July 5 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 18 – May 25 |
| Colorado Springs | 6a | May 3 | October 8 | May 17 – May 24 |
| Aurora | 6a | May 7 | October 8 | May 21 – May 28 |
| Fort Collins | 5b | May 2 | October 7 | May 16 – May 23 |
| Lakewood | 6a | May 3 | October 7 | May 17 – May 24 |
| Thornton | 6a | May 2 | October 11 | May 16 – May 23 |
| Arvada | 6a | May 5 | October 5 | May 19 – May 26 |
| Westminster | 6a | May 2 | October 11 | May 16 – May 23 |
Yardlong Bean in Colorado: FAQ
When can I plant yardlong bean in Colorado?
Across Colorado, the time to transplant yardlong bean spans roughly April 28 in Grand Junction to July 5 in Edwards, each following that city's local frost dates.
Does the yardlong bean planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right yardlong bean 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 yardlong bean take to grow in Colorado?
Yardlong Bean takes about 70–90 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
Never miss a window in your area
An email when it’s time to start seeds, transplant, and sow — timed to your frost dates. Double opt-in, one-click unsubscribe, no spam.