Hiland, WY frost dates
Last spring frostMay 30median date
First fall frostSep 22median date
Growing season115 daysfrost-free
Hardiness zone5aZone 5a
How Hiland compares
- In 8 years out of 10, the last spring frost in Hiland falls between May 12 and June 13, a 32-day window. The first fall frost falls between September 8 and October 4.
- The median last frost is 9 days later than the Wyoming median of May 21.
- Its 115-day growing season is longer than 25% of the 153 Wyoming places with a regular frost season (state median 125 days).
- The last frost is 27 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 200 nights a year at or below 32°F.
- Compared with Casper, WY, 87 km away, the last frost here is 20 days later than there and the growing season is 27 days shorter.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | May 12 |
| 50% (median) | May 30 |
| 10% (safe for tender plants) | June 13 |
| 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 Hiland, WY
Hiland, WY frost dates — last frost May 30, first frost Sep 22, zone 5a. whenisthelastfrost.com
Crop
JFMAMJJASOND
Start indoors: Mar 7 to Mar 21Transplant outside: May 2 to May 16
Start indoors: Mar 21 to Apr 4Transplant outside: Jun 13 to Jun 27
Start indoors: Mar 21 to Apr 4Transplant outside: Jun 13 to Jun 27
Start indoors: Apr 4 to Apr 18Transplant outside: Jun 6 to Jun 20
Start indoors: Apr 4 to Apr 18Transplant outside: May 9 to May 23Sow outdoors: May 2 to Jun 6Plant for fall: Jul 28 to Aug 25
Start indoors: Apr 4 to Apr 18Transplant outside: May 2 to May 16Sow outdoors: May 2 to May 16Plant for fall: Jul 14 to Aug 4
Start indoors: Apr 4 to Apr 18Transplant outside: May 16 to May 30Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 4 to Apr 18Transplant outside: May 9 to May 23Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 4 to Apr 18Transplant outside: May 16 to May 30Plant for fall: Jun 16 to Jul 7
Start indoors: Apr 18 to May 2Transplant outside: Jun 20 to Jul 4Sow outdoors: Jun 20 to Jul 4
Start indoors: Apr 18 to May 2Transplant outside: Jun 6 to Jun 20
Sow outdoors: Apr 18 to May 9Plant for fall: Jun 30 to Jul 21
Sow outdoors: Apr 18 to May 9Plant for fall: Jul 28 to Aug 18
Sow outdoors: Apr 25 to Jun 6Plant for fall: Aug 11 to Sep 1
Start indoors: May 2 to May 9Transplant outside: Jun 13 to Jun 20Sow outdoors: Jun 6 to Jun 20Plant for fall: Jul 7 to Jul 21
Start indoors: May 2 to May 9Sow outdoors: Jun 6 to Jun 20Plant for fall: Jul 14 to Jul 28
Start indoors: May 2 to May 9Sow outdoors: Jun 6 to Jun 20
Start indoors: May 2 to May 9Transplant outside: Jun 13 to Jun 27
Sow outdoors: May 9 to Jun 6Plant for fall: Jun 30 to Jul 14
Sow outdoors: May 9 to Jun 6Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 9 to May 30
Sow outdoors: May 16 to Jun 13Plant for fall: Jul 14 to Jul 28
Sow outdoors: May 16 to Jun 6Plant for fall: Jul 28 to Aug 18
Sow outdoors: Jun 6 to Jun 27
Sow outdoors: Jun 6 to Jun 20
Transplant outside: Jun 13 to Jul 4
Plant for fall: Sep 8 to Oct 13
Start indoorsTransplant outsideSow outdoorsPlant for fallMedian frost dates
When to plant vegetables in Hiland, WY
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Mar 7 – Mar 21 | May 2 – May 16 | — | — |
| Peppers | Mar 21 – Apr 4 | Jun 13 – Jun 27 | — | — |
| Eggplant | Mar 21 – Apr 4 | Jun 13 – Jun 27 | — | — |
| Tomatoes | Apr 4 – Apr 18 | Jun 6 – Jun 20 | — | — |
| Lettuce | Apr 4 – Apr 18 | May 9 – May 23 | May 2 – Jun 6 | Jul 28 – Aug 25 |
| Kale | Apr 4 – Apr 18 | May 2 – May 16 | May 2 – May 16 | Jul 14 – Aug 4 |
| Broccoli | Apr 4 – Apr 18 | May 16 – May 30 | — | Jun 16 – Jul 7 |
| Cabbage | Apr 4 – Apr 18 | May 9 – May 23 | — | Jun 16 – Jul 7 |
| Cauliflower | Apr 4 – Apr 18 | May 16 – May 30 | — | Jun 16 – Jul 7 |
| Okra | Apr 18 – May 2 | Jun 20 – Jul 4 | Jun 20 – Jul 4 | — |
| Basil | Apr 18 – May 2 | Jun 6 – Jun 20 | — | — |
| Peas | — | — | Apr 18 – May 9 | Jun 30 – Jul 21 |
| Spinach | — | — | Apr 18 – May 9 | Jul 28 – Aug 18 |
| Radishes | — | — | Apr 25 – Jun 6 | Aug 11 – Sep 1 |
| Cucumbers | May 2 – May 9 | Jun 13 – Jun 20 | Jun 6 – Jun 20 | Jul 7 – Jul 21 |
| Zucchini & Summer Squash | May 2 – May 9 | — | Jun 6 – Jun 20 | Jul 14 – Jul 28 |
| Winter Squash & Pumpkins | May 2 – May 9 | — | Jun 6 – Jun 20 | — |
| Melons & Watermelon | May 2 – May 9 | Jun 13 – Jun 27 | — | — |
| Carrots | — | — | May 9 – Jun 6 | Jun 30 – Jul 14 |
| Beets | — | — | May 9 – Jun 6 | Jul 14 – Jul 28 |
| Potatoes | — | — | May 9 – May 30 | — |
| Swiss Chard | — | — | May 16 – Jun 13 | Jul 14 – Jul 28 |
| Cilantro | — | — | May 16 – Jun 6 | Jul 28 – Aug 18 |
| Green Beans | — | — | Jun 6 – Jun 27 | — |
| Sweet Corn | — | — | Jun 6 – Jun 20 | — |
| Sweet Potatoes | — | Jun 13 – Jul 4 | — | — |
| 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 Powder Rvr (School), WY weather station, 30 km away (elevation 5,722 ft (1,744 m)).
Frost dates near Hiland
- Arminto May 30 · Sep 22
- Powder River May 23 · Sep 20
- Lysite May 14 · Oct 3
- Natrona May 23 · Sep 20
- Shoshoni May 7 · Oct 3
- Riverton May 12 · Sep 24
- Jeffrey City Jun 1 · Sep 13
- Alcova May 9 · Oct 7
- Mills May 10 · Sep 29
- Casper May 10 · Sep 29
Frequently asked questions
When is the last frost in Hiland, WY?
The median last spring frost in Hiland, WY is May 30. There is still about a 10% chance of frost after June 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Hiland, 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 Hiland, WY?
About 115 days between the median last spring frost and first fall frost.
What planting zone is Hiland, WY?
Hiland, WY is in USDA hardiness zone 5a.