Van Tassell, WY frost dates
Last spring frostMay 17median date
First fall frostSep 28median date
Growing season134 daysfrost-free
Hardiness zone5aZone 5a
How Van Tassell compares
- In 8 years out of 10, the last spring frost in Van Tassell falls between May 5 and May 31, a 26-day window. The first fall frost falls between September 13 and October 11.
- The median last frost is 4 days earlier than the Wyoming median of May 21.
- Its 134-day growing season is longer than 65% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 14 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 174 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 5 |
| 50% (median) | May 17 |
| 10% (safe for tender plants) | May 31 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | September 13 |
| 50% (median) | September 28 |
| 90% (late) | October 11 |
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 Van Tassell, WY
Van Tassell, WY frost dates — last frost May 17, first frost Sep 28, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Feb 22 to Mar 8Transplant outside: Apr 19 to May 3
Start indoors: Mar 8 to Mar 22Transplant outside: May 31 to Jun 14
Start indoors: Mar 8 to Mar 22Transplant outside: May 31 to Jun 14
Start indoors: Mar 22 to Apr 5Transplant outside: May 24 to Jun 7
Start indoors: Mar 22 to Apr 5Transplant outside: Apr 26 to May 10Sow outdoors: Apr 19 to May 24Plant for fall: Aug 3 to Aug 31
Start indoors: Mar 22 to Apr 5Transplant outside: Apr 19 to May 3Sow outdoors: Apr 19 to May 3Plant for fall: Jul 20 to Aug 10
Start indoors: Mar 22 to Apr 5Transplant outside: May 3 to May 17Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 22 to Apr 5Transplant outside: Apr 26 to May 10Plant for fall: Jun 22 to Jul 13
Start indoors: Mar 22 to Apr 5Transplant outside: May 3 to May 17Plant for fall: Jun 22 to Jul 13
Start indoors: Apr 5 to Apr 19Transplant outside: Jun 7 to Jun 21Sow outdoors: Jun 7 to Jun 21
Start indoors: Apr 5 to Apr 19Transplant outside: May 24 to Jun 7
Sow outdoors: Apr 5 to Apr 26Plant for fall: Jul 6 to Jul 27
Sow outdoors: Apr 5 to Apr 26Plant for fall: Aug 3 to Aug 24
Sow outdoors: Apr 12 to May 24Plant for fall: Aug 17 to Sep 7
Start indoors: Apr 19 to Apr 26Transplant outside: May 31 to Jun 7Sow outdoors: May 24 to Jun 7Plant for fall: Jul 13 to Jul 27
Start indoors: Apr 19 to Apr 26Sow outdoors: May 24 to Jun 7Plant for fall: Jul 20 to Aug 3
Start indoors: Apr 19 to Apr 26Sow outdoors: May 24 to Jun 7
Start indoors: Apr 19 to Apr 26Transplant outside: May 31 to Jun 14
Sow outdoors: Apr 26 to May 24Plant for fall: Jul 6 to Jul 20
Sow outdoors: Apr 26 to May 24Plant for fall: Jul 20 to Aug 3
Sow outdoors: Apr 26 to May 17
Sow outdoors: May 3 to May 31Plant for fall: Jul 20 to Aug 3
Sow outdoors: May 3 to May 24Plant for fall: Aug 3 to Aug 24
Sow outdoors: May 24 to Jun 14Plant for fall: Jul 13 to Jul 27
Sow outdoors: May 24 to Jun 7
Transplant outside: May 31 to Jun 21
Plant for fall: Sep 14 to Oct 19
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Van Tassell, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Feb 22 – Mar 8 | Apr 19 – May 3 | — | — |
| Peppers | Mar 8 – Mar 22 | May 31 – Jun 14 | — | — |
| Eggplant | Mar 8 – Mar 22 | May 31 – Jun 14 | — | — |
| Tomatoes | Mar 22 – Apr 5 | May 24 – Jun 7 | — | — |
| Lettuce | Mar 22 – Apr 5 | Apr 26 – May 10 | Apr 19 – May 24 | Aug 3 – Aug 31 |
| Kale | Mar 22 – Apr 5 | Apr 19 – May 3 | Apr 19 – May 3 | Jul 20 – Aug 10 |
| Broccoli | Mar 22 – Apr 5 | May 3 – May 17 | — | Jun 22 – Jul 13 |
| Cabbage | Mar 22 – Apr 5 | Apr 26 – May 10 | — | Jun 22 – Jul 13 |
| Cauliflower | Mar 22 – Apr 5 | May 3 – May 17 | — | Jun 22 – Jul 13 |
| Okra | Apr 5 – Apr 19 | Jun 7 – Jun 21 | Jun 7 – Jun 21 | — |
| Basil | Apr 5 – Apr 19 | May 24 – Jun 7 | — | — |
| Peas | — | — | Apr 5 – Apr 26 | Jul 6 – Jul 27 |
| Spinach | — | — | Apr 5 – Apr 26 | Aug 3 – Aug 24 |
| Radishes | — | — | Apr 12 – May 24 | Aug 17 – Sep 7 |
| Cucumbers | Apr 19 – Apr 26 | May 31 – Jun 7 | May 24 – Jun 7 | Jul 13 – Jul 27 |
| Zucchini & Summer Squash | Apr 19 – Apr 26 | — | May 24 – Jun 7 | Jul 20 – Aug 3 |
| Winter Squash & Pumpkins | Apr 19 – Apr 26 | — | May 24 – Jun 7 | — |
| Melons & Watermelon | Apr 19 – Apr 26 | May 31 – Jun 14 | — | — |
| Carrots | — | — | Apr 26 – May 24 | Jul 6 – Jul 20 |
| Beets | — | — | Apr 26 – May 24 | Jul 20 – Aug 3 |
| Potatoes | — | — | Apr 26 – May 17 | — |
| Swiss Chard | — | — | May 3 – May 31 | Jul 20 – Aug 3 |
| Cilantro | — | — | May 3 – May 24 | Aug 3 – Aug 24 |
| Green Beans | — | — | May 24 – Jun 14 | Jul 13 – Jul 27 |
| Sweet Corn | — | — | May 24 – Jun 7 | — |
| Sweet Potatoes | — | May 31 – Jun 21 | — | — |
| Garlic | — | — | — | Sep 14 – Oct 19 |
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 Harrison 4nw, NE weather station, 18 km away (elevation 5,072 ft (1,546 m)).
Frost dates near Van Tassell
- Lusk May 23 · Sep 20
- Jay Em May 23 · Sep 20
- Manville May 23 · Sep 20
- Lance Creek May 17 · Sep 25
- Fort Laramie May 14 · Sep 26
- Hartville May 11 · Oct 3
- Lingle May 20 · Sep 22
- Lost Springs May 17 · Sep 25
- Guernsey May 7 · Oct 6
- Shawnee May 25 · Sep 15
Frequently asked questions
When is the last frost in Van Tassell, WY?
The median last spring frost in Van Tassell, WY is May 17. There is still about a 10% chance of frost after May 31, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Van Tassell, WY?
The median first fall frost is September 28, with about a 10% chance of frost before September 13.
How long is the growing season in Van Tassell, WY?
About 134 days between the median last spring frost and first fall frost.
What planting zone is Van Tassell, WY?
Van Tassell, WY is in USDA hardiness zone 5a.