Frost dates in Natrona County, Wyoming
The average last spring frost in Natrona County falls May 9 to May 30 and the average first fall frost Sep 20 to Oct 7, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 5a. Places: Alcova, Casper, Casper Mountain, Edgerton, Evansville, Midwest. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 82601 | Casper Mountain | May 26 | Sep 22 | 5a |
| 82604 | Vista West | May 26 | Sep 22 | 5a |
| 82609 | Casper | May 10 | Sep 29 | 5a |
| 82620 | Alcova | May 9 | Oct 7 | 5a |
| 82630 | May 30 | Sep 22 | 5a | |
| 82635 | Edgerton | May 22 | Sep 22 | 5a |
| 82636 | Evansville | May 10 | Sep 29 | 5a |
| 82638 | May 30 | Sep 22 | 5a | |
| 82643 | Midwest | May 22 | Sep 22 | 5a |
| 82644 | Mills | May 10 | Sep 29 | 5a |
| 82646 | May 23 | Sep 20 | 5a | |
| 82648 | Powder River | May 23 | Sep 20 | 5a |
Nearby counties
Johnson County Converse County Washakie County Fremont County Hot Springs County Carbon County
All Wyoming counties · Download Wyoming frost dates (CSV)
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