Frost dates for Moon Lake, UT
At Moon Lake, the median last spring frost (32°F) is Jun 11 and the median first fall frost is Sep 18, for a typical growing season of 97 days. For a 90% chance that the last frost has passed, wait until Jun 24. Nearby ZIP codes are in USDA hardiness zones 5a to 6a.
- Jun 11Last spring frost (median)50% chance of 32°F after this date
- Jun 24Safer planting date10% chance of 32°F after this date
- Sep 18First fall frost (median)50% chance of 32°F by this date
- 97 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 | Jun 9 | Jun 22 | Jul 6 |
| 32°F | May 29 | Jun 11 | Jun 24 |
| 28°F | May 15 | Jun 1 | Jun 14 |
| 24°F | May 2 | May 17 | Jun 5 |
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 | Aug 26 | Sep 9 | Sep 21 |
| 32°F | Sep 5 | Sep 18 | Sep 30 |
| 28°F | Sep 14 | Sep 28 | Oct 12 |
| 24°F | Sep 24 | Oct 10 | Oct 25 |
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 | 55 days | 77 days | 95 days |
| 32°F | 79 days | 97 days | 115 days |
| 28°F | 98 days | 118 days | 138 days |
| 24°F | 119 days | 144 days | 165 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 |
|---|---|---|---|
| 84031 | 5a | -20 to -15°F | 17 km |
| 84072 | 6a | -10 to -5°F | 25 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 USC00425815, at 40.5617, -110.4925, elevation 2476 m (8,125 ft).
- Data quality: Estimated from nearby stations (2+ years), 2 years of freeze data.
- Average days per year at or below 32°F: 230.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Altamont (27 km)
- Neola (41 km)
- Duchesne (44 km)
- Roosevelt Radio (54 km)
- Myton (55 km)
- Fort Duchesne (62 km)
- Kamas (67 km)
- Coalville 13 E (69 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.