Frost dates for Fields, OR
At Fields, the median last spring frost (32°F) is May 10 and the median first fall frost is Oct 7, for a typical growing season of 145 days. For a 90% chance that the last frost has passed, wait until Jun 3. Nearby ZIP codes are in USDA hardiness zone 6b.
- May 10Last spring frost (median)50% chance of 32°F after this date
- Jun 3Safer planting date10% chance of 32°F after this date
- Oct 7First fall frost (median)50% chance of 32°F by this date
- 145 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 11 | Jun 4 | Jun 21 |
| 32°F | Apr 25 | May 10 | Jun 3 |
| 28°F | Apr 9 | Apr 27 | May 15 |
| 24°F | Mar 18 | Apr 11 | May 2 |
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 8 | Sep 25 | Oct 9 |
| 32°F | Sep 21 | Oct 7 | Oct 21 |
| 28°F | Oct 4 | Oct 19 | Nov 3 |
| 24°F | Oct 16 | Oct 30 | Nov 13 |
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 | 90 days | 113 days | 139 days |
| 32°F | 118 days | 145 days | 170 days |
| 28°F | 151 days | 174 days | 196 days |
| 24°F | 173 days | 200 days | 229 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 |
|---|---|---|---|
| 97710 | 6b | -5 to 0°F | 18 km |
| 97721 | 6b | -5 to 0°F | 35 km |
| 97736 | 6b | -5 to 0°F | 49 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 USC00352876, at 42.2642, -118.6758, elevation 1288 m (4,227 ft).
- Data quality: Representative (10+ years), 17 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
- Mc Dermitt 26 N (69 km)
- Rome St. Airport (76 km)
- Hart Mountain Refuge (86 km)
- Rome 2 NW (106 km)
- Malheur Refuge HQ (112 km)
- O O Rch (124 km)
- Alkali Lake (133 km)
- Riverside 7 SSW (137 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.