When to plant in Wyoming
Most of Wyoming sees its last spring frost between May 10 and Jun 14, and its first fall frost between Sep 1 and Oct 1. The middle of the state is around May 22 and September 23: that's what the dates below use.
Hardiness zones in Wyoming: 4a (5%), 4b (23%), 5a (57%), 5b (15%).
Planting dates for common crops
| Crop | Start indoors | Plant outside | Harvest | Plant for fall |
|---|---|---|---|---|
| Tomato | Apr 18 | Jun 6 – Jun 20 | Aug 15 – Sep 23 | — |
| Pepper | Apr 4 | Jun 6 – Jun 20 | Aug 20 – Sep 23 | — |
| Cucumber | — | Jun 6 – Jun 20 | Jul 31 – Sep 18 | — |
| Zucchini / Summer squash | — | Jun 6 – Jun 20 | Jul 26 – Sep 23 | — |
| Winter squash | — | Jun 6 – Jun 20 | Sep 9 – Sep 23 | — |
| Green beans (bush) | — | Jun 6 – Jun 20 | Jul 31 – Sep 11 | — |
| Peas | — | Apr 10 – Apr 24 | Jun 9 – Jul 14 | Jul 4 – Jul 18 |
| Sweet corn | — | Jun 6 – Jun 20 | Aug 20 – Sep 17 | — |
| Lettuce | — | Apr 24 – May 8 | Jun 8 – Jul 20 | Jul 26 – Aug 9 |
| Spinach | — | Apr 10 – Apr 24 | May 20 – Jul 1 | Aug 14 – Aug 28 |
| Kale | Mar 13 | Apr 24 – May 8 | Jun 18 – Sep 10 | Aug 13 – Aug 27 |
| Broccoli | Mar 20 | May 1 – May 15 | Jun 30 – Aug 4 | Jul 18 – Aug 1 |
| Cabbage | Mar 13 | Apr 24 – May 8 | Jul 3 – Aug 7 | Jul 15 – Jul 29 |
| Carrot | — | May 1 – May 15 | Jul 10 – Aug 21 | Jul 15 – Jul 29 |
| Beet | — | May 1 – May 15 | Jun 25 – Aug 6 | Jul 23 – Aug 6 |
| Radish | — | Apr 17 – May 1 | May 12 – Jun 9 | Aug 15 – Aug 29 |
| Onion (sets) | — | Apr 17 – May 1 | Jul 26 – Aug 30 | — |
| Garlic | — | Sep 16 – Oct 7 (fall) | Jul 17 – Aug 7 next year | — |
| Potato | — | May 1 – May 15 | Jul 30 – Sep 3 | — |
| Sweet potato Tight season: harvest may be cut short by frost. Choose an early variety. | May 1 | Jun 12 – Jun 26 | Sep 20 – Sep 23 | — |
| Watermelon | — | Jun 12 – Jun 26 | Sep 5 – Sep 23 | — |
| Basil | Apr 25 | Jun 6 – Jun 20 | Jul 6 – Sep 23 | — |
| Strawberry (June-bearing) | — | May 1 – May 15 | Jun 19 – Jul 17 (once established) | — |
| Sunflower | — | Jun 6 – Jun 20 | Aug 25 – Sep 23 | — |
Dates for a typical spot in Wyoming. Colder and higher places plant later, warmer ones earlier: enter your ZIP code for yours, or see the calendar for your zone.
Frost dates around Wyoming
| Place | Zone | Last frost | First frost |
|---|---|---|---|
| Cheyenne | 5b | May 21 | Sep 24 |
| Casper | 5a | May 12 | Sep 29 |
| Gillette | 5a | May 22 | Sep 25 |
| Laramie | 4b | Jun 7 | Sep 4 |
| Evanston | 5a | Jun 12 | Sep 12 |
| Jackson | 4b | Jun 20 | Aug 31 |
| Rock Springs | 5b | May 24 | Sep 28 |
| Afton | 5b | Jun 20 | Sep 1 |
| Aladdin | 5a | May 7 | Oct 3 |
| Albin | 5b | May 14 | Oct 2 |
Average dates from the nearest NOAA weather stations (1991–2020). Click a place for its full planting calendar.