Frost dates for Natural Bridges National Monument, UT
At Natural Bridges National Monument, the median last spring frost (32°F) is May 5 and the median first fall frost is Oct 13, for a typical growing season of 157 days. For a 90% chance that the last frost has passed, wait until May 27. Nearby ZIP codes are in USDA hardiness zones 6b to 8a.
- May 5Last spring frost (median)50% chance of 32°F after this date
- May 27Safer planting date10% chance of 32°F after this date
- Oct 13First 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 20 | Jun 6 |
| 32°F | Apr 22 | May 5 | May 27 |
| 28°F | Apr 6 | Apr 24 | May 11 |
| 24°F | Mar 16 | Apr 9 | Apr 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 | Sep 23 | Oct 5 | Oct 17 |
| 32°F | Sep 29 | Oct 13 | Oct 27 |
| 28°F | Oct 7 | Oct 23 | Nov 8 |
| 24°F | Oct 16 | Nov 3 | Nov 20 |
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 | 112 days | 134 days | 155 days |
| 32°F | 133 days | 157 days | 177 days |
| 28°F | 157 days | 181 days | 203 days |
| 24°F | 181 days | 208 days | 234 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 |
|---|---|---|---|
| 84511 | 7a | 0 to 5°F | 51 km |
| 84533 | 8a | 10 to 15°F | 54 km |
| 84536 | 8a | 10 to 15°F | 57 km |
| 84512 | 7a | 0 to 5°F | 61 km |
| 84531 | 7b | 5 to 10°F | 62 km |
| 84535 | 6b | -5 to 0°F | 66 km |
| 84534 | 7a | 0 to 5°F | 77 km |
| 81324 | 6b | -5 to 0°F | 85 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 USC00426053, at 37.6094, -109.9772, elevation 1984 m (6,508 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 147.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Valley Of The Gods (38 km)
- Blanding (43 km)
- Hite Ranger Station (47 km)
- Bluff (52 km)
- Mexican Hat (52 km)
- Monticello #2 (62 km)
- Canyonlands-The Needles (65 km)
- Monticello 2e (66 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.