When to plant swiss chard in Wyoming
Wyoming spans USDA zones 4a–5b, so the right time to plant swiss chard shifts by weeks across the state. The window to sow seed directly outdoors runs from about April 26 in Casper to June 6 in Jackson — below are local dates for 11 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Cheyenne | 5b | May 14 | October 1 | April 30 – June 11 |
| Casper | 5a | May 10 | September 29 | April 26 – June 7 |
| Gillette | 4b | May 15 | October 1 | May 1 – June 12 |
| Laramie | 4a | June 7 | September 4 | May 24 – July 5 |
| Rock Springs | 5a | May 24 | September 24 | May 10 – June 21 |
| Sheridan | 5a | May 21 | September 23 | May 7 – June 18 |
| Evanston | 5a | June 12 | September 12 | May 29 – July 10 |
| Green River | 5a | May 24 | September 22 | May 10 – June 21 |
Swiss Chard in Wyoming: FAQ
When can I plant swiss chard in Wyoming?
Across Wyoming, the time to direct-sow swiss chard spans roughly April 26 in Casper to June 6 in Jackson, each following that city's local frost dates.
Does the swiss chard planting date vary across Wyoming?
Yes. Wyoming publishes 11 cities with their own frost dates, so the right swiss chard 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 swiss chard take to grow in Wyoming?
Swiss Chard takes about 50–60 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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