When to plant gai lan (chinese broccoli) in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant gai lan (chinese broccoli) shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 24 in Grand Junction to May 31 in Edwards — below are local dates for 70 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Denver | 6a | May 4 | October 8 | April 13 – May 18 |
| Colorado Springs | 6a | May 3 | October 8 | April 12 – May 17 |
| Aurora | 6a | May 7 | October 8 | April 16 – May 21 |
| Fort Collins | 5b | May 2 | October 7 | April 11 – May 16 |
| Lakewood | 6a | May 3 | October 7 | April 12 – May 17 |
| Thornton | 6a | May 2 | October 11 | April 11 – May 16 |
| Arvada | 6a | May 5 | October 5 | April 14 – May 19 |
| Westminster | 6a | May 2 | October 11 | April 11 – May 16 |
Gai Lan (Chinese Broccoli) in Colorado: FAQ
When can I plant gai lan (chinese broccoli) in Colorado?
Across Colorado, the time to direct-sow gai lan (chinese broccoli) spans roughly March 24 in Grand Junction to May 31 in Edwards, each following that city's local frost dates.
Does the gai lan (chinese broccoli) planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right gai lan (chinese broccoli) 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 gai lan (chinese broccoli) take to grow in Colorado?
Gai Lan (Chinese Broccoli) takes about 50–70 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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