When to plant orach in Colorado
Colorado spans USDA zones 5b–7a, so the right time to plant orach shifts by weeks across the state. The window to sow seed directly outdoors runs from about March 31 in Grand Junction to June 7 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 20 – May 18 |
| Colorado Springs | 6a | May 3 | October 8 | April 19 – May 17 |
| Aurora | 6a | May 7 | October 8 | April 23 – May 21 |
| Fort Collins | 5b | May 2 | October 7 | April 18 – May 16 |
| Lakewood | 6a | May 3 | October 7 | April 19 – May 17 |
| Thornton | 6a | May 2 | October 11 | April 18 – May 16 |
| Arvada | 6a | May 5 | October 5 | April 21 – May 19 |
| Westminster | 6a | May 2 | October 11 | April 18 – May 16 |
Orach in Colorado: FAQ
When can I plant orach in Colorado?
Across Colorado, the time to direct-sow orach spans roughly March 31 in Grand Junction to June 7 in Edwards, each following that city's local frost dates.
Does the orach planting date vary across Colorado?
Yes. Colorado publishes 70 cities with their own frost dates, so the right orach 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 orach take to grow in Colorado?
Orach takes about 40–60 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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