Wheatland, WY frost dates
Last spring frostMay 19median date
First fall frostSep 22median date
Growing season126 daysfrost-free
Hardiness zone5aZone 5a
How Wheatland compares
- In 8 years out of 10, the last spring frost in Wheatland falls between May 7 and June 2, a 26-day window. The first fall frost falls between September 8 and October 4.
- The median last frost is 2 days earlier than the Wyoming median of May 21.
- Its 126-day growing season is longer than 50% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 16 days later than the zone 5a median of May 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 5a chart.
- The weather station records an average of 153 nights a year at or below 32°F.
- Compared with Cheyenne, WY, 101 km away, the last frost here is 7 days later than there and the growing season is 16 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 7 |
| 50% (median) | May 19 |
| 10% (safe for tender plants) | June 2 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 8 |
| 50% (median) | September 22 |
| 90% (late) | October 4 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Wheatland, WY
Wheatland, WY frost dates — last frost May 19, first frost Sep 22, zone 5a. whenisthelastfrost.com
Crop
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Start indoors: Feb 24 to Mar 10Transplant outside: Apr 21 to May 5
Start indoors: Mar 10 to Mar 24Transplant outside: Jun 2 to Jun 16
Start indoors: Mar 10 to Mar 24Transplant outside: Jun 2 to Jun 16
Start indoors: Mar 24 to Apr 7Transplant outside: May 26 to Jun 9
Start indoors: Mar 24 to Apr 7Transplant outside: Apr 28 to May 12Sow outdoors: Apr 21 to May 26Plant for fall: Jul 28 to Aug 25
Start indoors: Mar 24 to Apr 7Transplant outside: Apr 21 to May 5Sow outdoors: Apr 21 to May 5Plant for fall: Jul 14 to Aug 4
Start indoors: Mar 24 to Apr 7Transplant outside: May 5 to May 19Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 24 to Apr 7Transplant outside: Apr 28 to May 12Plant for fall: Jun 16 to Jul 7
Start indoors: Mar 24 to Apr 7Transplant outside: May 5 to May 19Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 7 to Apr 21Transplant outside: Jun 9 to Jun 23Sow outdoors: Jun 9 to Jun 23
Start indoors: Apr 7 to Apr 21Transplant outside: May 26 to Jun 9
Sow outdoors: Apr 7 to Apr 28Plant for fall: Jun 30 to Jul 21
Sow outdoors: Apr 7 to Apr 28Plant for fall: Jul 28 to Aug 18
Sow outdoors: Apr 14 to May 26Plant for fall: Aug 11 to Sep 1
Start indoors: Apr 21 to Apr 28Transplant outside: Jun 2 to Jun 9Sow outdoors: May 26 to Jun 9Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 21 to Apr 28Sow outdoors: May 26 to Jun 9Plant for fall: Jul 14 to Jul 28
Start indoors: Apr 21 to Apr 28Sow outdoors: May 26 to Jun 9
Start indoors: Apr 21 to Apr 28Transplant outside: Jun 2 to Jun 16
Sow outdoors: Apr 28 to May 26Plant for fall: Jun 30 to Jul 14
Sow outdoors: Apr 28 to May 26Plant for fall: Jul 14 to Jul 28
Sow outdoors: Apr 28 to May 19
Sow outdoors: May 5 to Jun 2Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 5 to May 26Plant for fall: Jul 28 to Aug 18
Sow outdoors: May 26 to Jun 16Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 26 to Jun 9
Transplant outside: Jun 2 to Jun 23
Plant for fall: Sep 8 to Oct 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Wheatland, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 24 – Mar 10 | Apr 21 – May 5 | — | — |
| Peppers | Mar 10 – Mar 24 | Jun 2 – Jun 16 | — | — |
| Eggplant | Mar 10 – Mar 24 | Jun 2 – Jun 16 | — | — |
| Tomatoes | Mar 24 – Apr 7 | May 26 – Jun 9 | — | — |
| Lettuce | Mar 24 – Apr 7 | Apr 28 – May 12 | Apr 21 – May 26 | Jul 28 – Aug 25 |
| Kale | Mar 24 – Apr 7 | Apr 21 – May 5 | Apr 21 – May 5 | Jul 14 – Aug 4 |
| Broccoli | Mar 24 – Apr 7 | May 5 – May 19 | — | Jun 16 – Jul 7 |
| Cabbage | Mar 24 – Apr 7 | Apr 28 – May 12 | — | Jun 16 – Jul 7 |
| Cauliflower | Mar 24 – Apr 7 | May 5 – May 19 | — | Jun 16 – Jul 7 |
| Okra | Apr 7 – Apr 21 | Jun 9 – Jun 23 | Jun 9 – Jun 23 | — |
| Basil | Apr 7 – Apr 21 | May 26 – Jun 9 | — | — |
| Peas | — | — | Apr 7 – Apr 28 | Jun 30 – Jul 21 |
| Spinach | — | — | Apr 7 – Apr 28 | Jul 28 – Aug 18 |
| Radishes | — | — | Apr 14 – May 26 | Aug 11 – Sep 1 |
| Cucumbers | Apr 21 – Apr 28 | Jun 2 – Jun 9 | May 26 – Jun 9 | Jul 7 – Jul 21 |
| Zucchini & Summer Squash | Apr 21 – Apr 28 | — | May 26 – Jun 9 | Jul 14 – Jul 28 |
| Winter Squash & Pumpkins | Apr 21 – Apr 28 | — | May 26 – Jun 9 | — |
| Melons & Watermelon | Apr 21 – Apr 28 | Jun 2 – Jun 16 | — | — |
| Carrots | — | — | Apr 28 – May 26 | Jun 30 – Jul 14 |
| Beets | — | — | Apr 28 – May 26 | Jul 14 – Jul 28 |
| Potatoes | — | — | Apr 28 – May 19 | — |
| Swiss Chard | — | — | May 5 – Jun 2 | Jul 14 – Jul 28 |
| Cilantro | — | — | May 5 – May 26 | Jul 28 – Aug 18 |
| Green Beans | — | — | May 26 – Jun 16 | Jul 7 – Jul 21 |
| Sweet Corn | — | — | May 26 – Jun 9 | — |
| Sweet Potatoes | — | Jun 2 – Jun 23 | — | — |
| Garlic | — | — | — | Sep 8 – Oct 13 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Wheatland 4 N, WY weather station, 7 km away (elevation 4,639 ft (1,414 m)).
Frost dates near Wheatland
- Guernsey May 7 · Oct 6
- Chugwater May 18 · Sep 24
- Hartville May 11 · Oct 3
- Fort Laramie May 14 · Sep 26
- Veteran May 15 · Sep 27
- Glendo May 9 · Oct 5
- Yoder May 15 · Sep 27
- Lingle May 20 · Sep 22
- Garrett Jun 2 · Sep 9
- Jay Em May 23 · Sep 20
Frequently asked questions
When is the last frost in Wheatland, WY?
The median last spring frost in Wheatland, WY is May 19. There is still about a 10% chance of frost after June 2, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Wheatland, WY?
The median first fall frost is September 22, with about a 10% chance of frost before September 8.
How long is the growing season in Wheatland, WY?
About 126 days between the median last spring frost and first fall frost.
What planting zone is Wheatland, WY?
Wheatland, WY is in USDA hardiness zone 5a.