Frost dates for Fish Springs Nwr, UT
At Fish Springs Nwr, the median last spring frost (32°F) is Apr 26 and the median first fall frost is Oct 14, for a typical growing season of 169 days. For a 90% chance that the last frost has passed, wait until May 17. Nearby ZIP codes are in USDA hardiness zones 6a to 7a.
- Apr 26Last spring frost (median)50% chance of 32°F after this date
- May 17Safer planting date10% chance of 32°F after this date
- Oct 14First fall frost (median)50% chance of 32°F by this date
- 169 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 | Apr 23 | May 8 | Jun 1 |
| 32°F | Apr 9 | Apr 26 | May 17 |
| 28°F | Mar 22 | Apr 11 | May 1 |
| 24°F | Mar 6 | Mar 25 | Apr 16 |
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 23 | Oct 4 | Oct 17 |
| 32°F | Oct 1 | Oct 14 | Oct 25 |
| 28°F | Oct 10 | Oct 23 | Nov 5 |
| 24°F | Oct 18 | Nov 1 | Nov 16 |
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 | 122 days | 147 days | 167 days |
| 32°F | 143 days | 169 days | 190 days |
| 28°F | 167 days | 194 days | 214 days |
| 24°F | 193 days | 220 days | 244 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 |
|---|---|---|---|
| 84034 | 6b | -5 to 0°F | 44 km |
| 84728 | 6a | -10 to -5°F | 72 km |
| 84635 | 6a | -10 to -5°F | 76 km |
| 84080 | 6b | -5 to 0°F | 83 km |
| 84624 | 6a | -10 to -5°F | 86 km |
| 84022 | 6b | -5 to 0°F | 86 km |
| 84029 | 7a | 0 to 5°F | 90 km |
| 89311 | 6b | -5 to 0°F | 93 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 USC00422852, at 39.8400, -113.3978, elevation 1328 m (4,357 ft).
- Data quality: Representative (10+ years), 22 years of freeze data.
- Average days per year at or below 32°F: 134.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Callao (28 km)
- Granite Peak Dugway Pg (36 km)
- Partoun (48 km)
- Ibapah (55 km)
- Dugway (56 km)
- Vernon (87 km)
- Johnson Pass (87 km)
- Deseret (89 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.