Frost dates for Dugway, UT
At Dugway, the median last spring frost (32°F) is May 11 and the median first fall frost is Oct 2, for a typical growing season of 143 days. For a 90% chance that the last frost has passed, wait until May 29. Nearby ZIP codes are in USDA hardiness zones 6a to 7a.
- May 11Last spring frost (median)50% chance of 32°F after this date
- May 29Safer planting date10% chance of 32°F after this date
- Oct 2First fall frost (median)50% chance of 32°F by this date
- 143 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 8 | May 23 | Jun 8 |
| 32°F | Apr 25 | May 11 | May 29 |
| 28°F | Apr 9 | Apr 28 | May 17 |
| 24°F | Mar 21 | Apr 12 | May 3 |
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 | Sep 10 | Sep 24 | Oct 5 |
| 32°F | Sep 19 | Oct 2 | Oct 15 |
| 28°F | Sep 28 | Oct 12 | Oct 25 |
| 24°F | Oct 7 | Oct 23 | Nov 7 |
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 | 101 days | 122 days | 142 days |
| 32°F | 119 days | 143 days | 162 days |
| 28°F | 142 days | 164 days | 188 days |
| 24°F | 165 days | 191 days | 217 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 |
|---|---|---|---|
| 84022 | 6b | -5 to 0°F | 30 km |
| 84069 | 6a | -10 to -5°F | 42 km |
| 84080 | 6b | -5 to 0°F | 43 km |
| 84029 | 7a | 0 to 5°F | 43 km |
| 84071 | 6b | -5 to 0°F | 59 km |
| 84074 | 7a | 0 to 5°F | 69 km |
| 84013 | 6a | -10 to -5°F | 71 km |
| 84628 | 6b | -5 to 0°F | 72 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 USC00422257, at 40.1839, -112.9217, elevation 1324 m (4,345 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 165.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Johnson Pass (31 km)
- Granite Peak Dugway Pg (37 km)
- Vernon (42 km)
- Fish Springs Nwr (56 km)
- Grantsville 2w (58 km)
- Tooele (64 km)
- Fairfield (71 km)
- Little Sahara Rec Area (73 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.