Shawnee, WY frost dates
Last spring frostMay 25median date
First fall frostSep 15median date
Growing season113 daysfrost-free
Hardiness zone5aZone 5a
How Shawnee compares
- In 8 years out of 10, the last spring frost in Shawnee falls between May 13 and June 11, a 29-day window. The first fall frost falls between September 4 and September 27.
- The median last frost is 4 days later than the Wyoming median of May 21.
- Its 113-day growing season is longer than 24% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 22 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 204 nights a year at or below 32°F.
- Compared with Casper, WY, 109 km away, the last frost here is 15 days later than there and the growing season is 29 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 13 |
| 50% (median) | May 25 |
| 10% (safe for tender plants) | June 11 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 4 |
| 50% (median) | September 15 |
| 90% (late) | September 27 |
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 Shawnee, WY
Shawnee, WY frost dates — last frost May 25, first frost Sep 15, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 2 to Mar 16Transplant outside: Apr 27 to May 11
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 16 to Mar 30Transplant outside: Jun 8 to Jun 22
Start indoors: Mar 30 to Apr 13Transplant outside: Jun 1 to Jun 15
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Sow outdoors: Apr 27 to Jun 1Plant for fall: Jul 21 to Aug 18
Start indoors: Mar 30 to Apr 13Transplant outside: Apr 27 to May 11Sow outdoors: Apr 27 to May 11Plant for fall: Jul 7 to Jul 28
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 9 to Jun 30
Start indoors: Mar 30 to Apr 13Transplant outside: May 4 to May 18Plant for fall: Jun 9 to Jun 30
Start indoors: Mar 30 to Apr 13Transplant outside: May 11 to May 25Plant for fall: Jun 9 to Jun 30
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 15 to Jun 29Sow outdoors: Jun 15 to Jun 29
Start indoors: Apr 13 to Apr 27Transplant outside: Jun 1 to Jun 15
Sow outdoors: Apr 13 to May 4Plant for fall: Jun 23 to Jul 14
Sow outdoors: Apr 13 to May 4Plant for fall: Jul 21 to Aug 11
Sow outdoors: Apr 20 to Jun 1Plant for fall: Aug 4 to Aug 25
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 15Sow outdoors: Jun 1 to Jun 15Plant for fall: Jun 30 to Jul 14
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15Plant for fall: Jul 7 to Jul 21
Start indoors: Apr 27 to May 4Sow outdoors: Jun 1 to Jun 15
Start indoors: Apr 27 to May 4Transplant outside: Jun 8 to Jun 22
Sow outdoors: May 4 to Jun 1Plant for fall: Jun 23 to Jul 7
Sow outdoors: May 4 to Jun 1Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 4 to May 25
Sow outdoors: May 11 to Jun 8Plant for fall: Jul 7 to Jul 21
Sow outdoors: May 11 to Jun 1Plant for fall: Jul 21 to Aug 11
Sow outdoors: Jun 1 to Jun 22
Sow outdoors: Jun 1 to Jun 15
Transplant outside: Jun 8 to Jun 29
Plant for fall: Sep 1 to Oct 6
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Shawnee, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 2 – Mar 16 | Apr 27 – May 11 | — | — |
| Peppers | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Eggplant | Mar 16 – Mar 30 | Jun 8 – Jun 22 | — | — |
| Tomatoes | Mar 30 – Apr 13 | Jun 1 – Jun 15 | — | — |
| Lettuce | Mar 30 – Apr 13 | May 4 – May 18 | Apr 27 – Jun 1 | Jul 21 – Aug 18 |
| Kale | Mar 30 – Apr 13 | Apr 27 – May 11 | Apr 27 – May 11 | Jul 7 – Jul 28 |
| Broccoli | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 9 – Jun 30 |
| Cabbage | Mar 30 – Apr 13 | May 4 – May 18 | — | Jun 9 – Jun 30 |
| Cauliflower | Mar 30 – Apr 13 | May 11 – May 25 | — | Jun 9 – Jun 30 |
| Okra | Apr 13 – Apr 27 | Jun 15 – Jun 29 | Jun 15 – Jun 29 | — |
| Basil | Apr 13 – Apr 27 | Jun 1 – Jun 15 | — | — |
| Peas | — | — | Apr 13 – May 4 | Jun 23 – Jul 14 |
| Spinach | — | — | Apr 13 – May 4 | Jul 21 – Aug 11 |
| Radishes | — | — | Apr 20 – Jun 1 | Aug 4 – Aug 25 |
| Cucumbers | Apr 27 – May 4 | Jun 8 – Jun 15 | Jun 1 – Jun 15 | Jun 30 – Jul 14 |
| Zucchini & Summer Squash | Apr 27 – May 4 | — | Jun 1 – Jun 15 | Jul 7 – Jul 21 |
| Winter Squash & Pumpkins Warning: Your frost-free season is about 113 days, which is tight for winter squash & pumpkins (100+ days). Choose early varieties and use transplants or row covers. | Apr 27 – May 4 | — | Jun 1 – Jun 15 | — |
| Melons & Watermelon | Apr 27 – May 4 | Jun 8 – Jun 22 | — | — |
| Carrots | — | — | May 4 – Jun 1 | Jun 23 – Jul 7 |
| Beets | — | — | May 4 – Jun 1 | Jul 7 – Jul 21 |
| Potatoes | — | — | May 4 – May 25 | — |
| Swiss Chard | — | — | May 11 – Jun 8 | Jul 7 – Jul 21 |
| Cilantro | — | — | May 11 – Jun 1 | Jul 21 – Aug 11 |
| Green Beans | — | — | Jun 1 – Jun 22 | — |
| Sweet Corn | — | — | Jun 1 – Jun 15 | — |
| Sweet Potatoes Warning: Your frost-free season is about 113 days, which is tight for sweet potatoes (100+ days). Choose early varieties and use transplants or row covers. | — | Jun 8 – Jun 29 | — | — |
| Garlic | — | — | — | Sep 1 – Oct 6 |
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 Glendo 6ne, WY weather station, 26 km away (elevation 4,738 ft (1,444 m)).
Frost dates near Shawnee
- Manville May 23 · Sep 20
- Glendo May 9 · Oct 5
- Douglas May 19 · Sep 23
- Lost Springs May 17 · Sep 25
- Lance Creek May 17 · Sep 25
- Lusk May 23 · Sep 20
- Jay Em May 23 · Sep 20
- Hartville May 11 · Oct 3
- Guernsey May 7 · Oct 6
- Glenrock May 12 · Oct 1
Frequently asked questions
When is the last frost in Shawnee, WY?
The median last spring frost in Shawnee, WY is May 25. There is still about a 10% chance of frost after June 11, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Shawnee, WY?
The median first fall frost is September 15, with about a 10% chance of frost before September 4.
How long is the growing season in Shawnee, WY?
About 113 days between the median last spring frost and first fall frost.
What planting zone is Shawnee, WY?
Shawnee, WY is in USDA hardiness zone 5a.