When to plant Swiss chard in Wyoming
In spring, from Apr 20 – June 15 in Casper to June 1 – 15 in Laramie.
In fall, from May 15 – July 1 in Evanston to June 1 – July 1 in Sheridan.
USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.
| Place | Spring | Fall |
|---|---|---|
| Casper | Apr 20 – June 15 | June 1 – July 5 |
| Cheyenne | Apr 20 – June 15 | June 1 – July 5 |
| Cody | Apr 20 – June 15 | June 1 – July 5 |
| Evanston | June 1 – 15 | May 15 – July 1 |
| Gillette | Apr 20 – June 15 | June 1 – July 5 |
| Green River | May 10 – June 15 | June 1 – July 1 |
| Jackson | June 1 – 15 | May 15 – June 15 |
| Laramie | June 1 – 15 | May 15 – June 15 |
| Riverton | Apr 20 – June 15 | June 1 – July 1 |
| Rock Springs | May 10 – June 15 | June 1 – July 1 |
| Sheridan | May 10 – June 15 | June 1 – July 1 |
Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for swiss chard.