Frost dates for Milton Freewater, OR
At Milton Freewater, the median last spring frost (32°F) is Mar 25 and the median first fall frost is Oct 29, for a typical growing season of 218 days. For a 90% chance that the last frost has passed, wait until Apr 16. Nearby ZIP codes are in USDA hardiness zone 7a.
- Mar 25Last spring frost (median)50% chance of 32°F after this date
- Apr 16Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 218 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 | Mar 29 | Apr 19 | May 8 |
| 32°F | Mar 6 | Mar 25 | Apr 16 |
| 28°F | Feb 17 | Mar 5 | Mar 28 |
| 24°F | Jan 22 | Feb 21 | Mar 11 |
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 2 | Oct 17 | Nov 2 |
| 32°F | Oct 12 | Oct 29 | Nov 16 |
| 28°F | Oct 24 | Nov 11 | Dec 1 |
| 24°F | Nov 2 | Nov 24 | Dec 17 |
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 | 158 days | 182 days | 211 days |
| 32°F | 191 days | 218 days | 243 days |
| 28°F | 217 days | 247 days | 276 days |
| 24°F | 245 days | 275 days | 313 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 |
|---|---|---|---|
| 97862 | 7a | 0 to 5°F | 8 km |
| 97813 | 7a | 0 to 5°F | 14 km |
| 97886 | 7a | 0 to 5°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 USC00355593, at 45.9428, -118.4089, elevation 296 m (970 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 74.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Pendleton Branch Exp. Station (30 km)
- Pendleton Dwtn (43 km)
- Pendleton WFO (44 km)
- Pendleton (44 km)
- Meacham (48 km)
- Elgin (56 km)
- Pilot Rock 1 SE (61 km)
- Hermiston Muni Airport (67 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.