Frost dates for Zion National Park, UT
At Zion National Park, the median last spring frost (32°F) is Apr 13 and the median first fall frost is Nov 2, for a typical growing season of 202 days. For a 90% chance that the last frost has passed, wait until May 2. Nearby ZIP codes are in USDA hardiness zones 6b to 8a.
- Apr 13Last spring frost (median)50% chance of 32°F after this date
- May 2Safer planting date10% chance of 32°F after this date
- Nov 2First fall frost (median)50% chance of 32°F by this date
- 202 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 9 | Apr 26 | May 14 |
| 32°F | Mar 22 | Apr 13 | May 2 |
| 28°F | Feb 26 | Mar 23 | Apr 15 |
| 24°F | Feb 1 | Feb 28 | Mar 27 |
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 | Oct 9 | Oct 24 | Nov 7 |
| 32°F | Oct 20 | Nov 2 | Nov 17 |
| 28°F | Oct 27 | Nov 12 | Nov 26 |
| 24°F | Nov 5 | Nov 22 | Dec 8 |
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 | 155 days | 178 days | 201 days |
| 32°F | 177 days | 202 days | 226 days |
| 28°F | 203 days | 231 days | 264 days |
| 24°F | 233 days | 266 days | 295 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 84767 | 6b | -5 to 0°F | 1 km |
| 84763 | 8a | 10 to 15°F | 10 km |
| 84779 | 6b | -5 to 0°F | 19 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 USC00429717, at 37.2092, -112.9814, elevation 1231 m (4,038 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 71.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- La Verkin (25 km)
- Orderville (31 km)
- New Harmony (39 km)
- Blowhard Mountain Radar (44 km)
- Kanab (44 km)
- Cedar Breaks National Monument (46 km)
- Cedar City 5e (50 km)
- Alton (51 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.