Frost dates in Morton County, North Dakota
The average last spring frost in Morton County falls May 12 to May 19 and the average first fall frost Sep 21 to Sep 27, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4a. Places: Almont, Flasher, Glen Ullin, Hebron, Mandan, New Salem. 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 |
|---|---|---|---|---|
| 58520 | Almont | May 17 | Sep 21 | 4a |
| 58535 | Flasher | May 13 | Sep 27 | 4a |
| 58554 | Mandan | May 13 | Sep 27 | 4a |
| 58563 | New Salem | May 18 | Sep 24 | 4a |
| 58566 | May 12 | Sep 24 | 4a | |
| 58570 | Solen | May 12 | Sep 24 | 4a |
| 58631 | Glen Ullin | May 19 | Sep 21 | 4a |
| 58638 | Hebron | May 19 | Sep 21 | 4a |
Nearby counties
Grant County Oliver County Burleigh County Sioux County Mercer County Hettinger County
All North Dakota counties · Download North Dakota frost dates (CSV)
Never miss a frost: get The Dial
Weekly yard timing, plus frost and soil-temperature alerts for your ZIP code.
- Freeze alerts
- Soil-temp heads-up
- Weekly yard to-dos
Free. One weekly email plus alerts when your ZIP has a frost or a soil-temperature change worth acting on. After you submit, Kit (our email provider) sends a confirmation email: check your email and click the link to confirm. You aren't subscribed until you do. We collect only your email address and ZIP, sent to Kit to deliver The Dial. Unsubscribe anytime.