Frost dates for Santaquin Chlorinator, UT
At Santaquin Chlorinator, the median last spring frost (32°F) is May 4 and the median first fall frost is Oct 11, for a typical growing season of 157 days. For a 90% chance that the last frost has passed, wait until May 28. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 4Last spring frost (median)50% chance of 32°F after this date
- May 28Safer planting date10% chance of 32°F after this date
- Oct 11First fall frost (median)50% chance of 32°F by this date
- 157 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 3 | May 23 | Jun 8 |
| 32°F | Apr 18 | May 4 | May 28 |
| 28°F | Mar 31 | Apr 19 | May 10 |
| 24°F | Mar 11 | Apr 1 | Apr 20 |
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 18 | Oct 1 | Oct 15 |
| 32°F | Sep 27 | Oct 11 | Oct 26 |
| 28°F | Oct 8 | Oct 23 | Nov 7 |
| 24°F | Oct 19 | Nov 3 | Nov 19 |
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 | 109 days | 131 days | 154 days |
| 32°F | 132 days | 157 days | 179 days |
| 28°F | 160 days | 185 days | 209 days |
| 24°F | 189 days | 215 days | 239 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 |
|---|---|---|---|
| 84655 | 6b | -5 to 0°F | 3 km |
| 84651 | 6b | -5 to 0°F | 7 km |
| 84633 | 6b | -5 to 0°F | 10 km |
| 84645 | 6b | -5 to 0°F | 12 km |
| 84626 | 6b | -5 to 0°F | 18 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 USC00427686, at 39.9578, -111.7794, elevation 1573 m (5,160 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 144.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Spanish Fk Power House (20 km)
- Nephi (28 km)
- Provo Byu (34 km)
- Orem Trtmt Plant (36 km)
- Fairfield (43 km)
- Levan (45 km)
- Pleasant Grove (46 km)
- Utah Lake Lehi (46 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.