Frost dates for Watford City 14s, ND
At Watford City 14s, the median last spring frost (32°F) is May 22 and the median first fall frost is Sep 17, for a typical growing season of 119 days. For a 90% chance that the last frost has passed, wait until Jun 7. Nearby ZIP codes are in USDA hardiness zone 4a.
- May 22Last spring frost (median)50% chance of 32°F after this date
- Jun 7Safer planting date10% chance of 32°F after this date
- Sep 17First fall frost (median)50% chance of 32°F by this date
- 119 daysGrowing season (median)between 32°F freezes
Last spring frost dates
The chance that the temperature drops to the threshold after each date.
| Temperature | 90% chance later | 50% chance later | 10% chance later |
|---|---|---|---|
| 36°F | May 18 | Jun 2 | Jul 1 |
| 32°F | May 7 | May 22 | Jun 7 |
| 28°F | Apr 28 | May 11 | May 26 |
| 24°F | Apr 14 | Apr 29 | May 12 |
First fall frost dates
The chance that the temperature has dropped to the threshold by each date.
| Temperature | 10% chance by | 50% chance by | 90% chance by |
|---|---|---|---|
| 36°F | Aug 26 | Sep 9 | Sep 22 |
| 32°F | Sep 5 | Sep 17 | Oct 2 |
| 28°F | Sep 14 | Sep 27 | Oct 11 |
| 24°F | Sep 21 | Oct 8 | Oct 22 |
Growing season length
Days between the last spring and first fall freeze, as the length reached in 9, 5 and 1 out of 10 years.
| Temperature | 9 in 10 years at least | 5 in 10 years at least | 1 in 10 years at least |
|---|---|---|---|
| 36°F | 68 days | 96 days | 118 days |
| 32°F | 97 days | 119 days | 139 days |
| 28°F | 119 days | 140 days | 159 days |
| 24°F | 141 days | 160 days | 180 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 58634 | 4a | -30 to -25°F | 19 km |
| 58835 | 4a | -30 to -25°F | 21 km |
| 58854 | 4a | -30 to -25°F | 27 km |
| 58640 | 4a | -30 to -25°F | 31 km |
| 58627 | 4a | -30 to -25°F | 41 km |
| 58831 | 4a | -30 to -25°F | 41 km |
| 58847 | 4a | -30 to -25°F | 42 km |
| 58838 | 4a | -30 to -25°F | 52 km |
Not the official USDA Plant Hardiness Zone Map. Zones shown here are the values published in the USDA-ARS / Oregon State University PRISM Group 2023 ZIP code tables, shown unaltered. For the official interactive map, visit planthardiness.ars.usda.gov.
About this station
- NOAA station ID USC00329246, at 47.6000, -103.2597, elevation 618 m (2,027 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 188.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Grassy Butte 2ene (22 km)
- Watford City (23 km)
- Keene 3s (42 km)
- Killdeer (45 km)
- Fairfield (46 km)
- Dickinson Rch HQ (55 km)
- Dunn Center 1e (58 km)
- Trotters 3 SSE (60 km)
Sources
- NOAA National Centers for Environmental Information, U.S. Climate Normals 1991–2020, annual/seasonal normals by station (version 1.0.1), file dated June 27, 2023; documentation.
- USDA Agricultural Research Service and PRISM Group, Oregon State University, 2023 Plant Hardiness Zone Map ZIP code tables (CONUS, Alaska, Hawaii, Puerto Rico), files dated November 17, 2023. Data © PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed November 1, 2026. Official map: planthardiness.ars.usda.gov.
- U.S. Census Bureau, 2024 Gazetteer ZIP Code Tabulation Areas file, dated August 30, 2024 (ZIP centroids used to find the nearest station).
Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.