Frost dates for Wapato, WA
At Wapato, the median last spring frost (32°F) is Apr 21 and the median first fall frost is Oct 15, for a typical growing season of 176 days. For a 90% chance that the last frost has passed, wait until May 7. Nearby ZIP codes are in USDA hardiness zone 7a.
- Apr 21Last spring frost (median)50% chance of 32°F after this date
- May 7Safer planting date10% chance of 32°F after this date
- Oct 15First fall frost (median)50% chance of 32°F by this date
- 176 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 | Apr 22 | May 6 | May 25 |
| 32°F | Apr 1 | Apr 21 | May 7 |
| 28°F | Mar 10 | Mar 31 | Apr 21 |
| 24°F | Feb 21 | Mar 8 | Mar 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 25 | Oct 5 | Oct 16 |
| 32°F | Oct 4 | Oct 15 | Oct 27 |
| 28°F | Oct 13 | Oct 26 | Nov 9 |
| 24°F | Oct 23 | Nov 5 | Nov 23 |
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 | 131 days | 150 days | 168 days |
| 32°F | 156 days | 176 days | 199 days |
| 28°F | 186 days | 210 days | 233 days |
| 24°F | 218 days | 241 days | 263 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 |
|---|---|---|---|
| 98951 | 7a | 0 to 5°F | 8 km |
| 98921 | 7a | 0 to 5°F | 8 km |
| 98939 | 7a | 0 to 5°F | 8 km |
| 98933 | 7a | 0 to 5°F | 17 km |
| 98948 | 7a | 0 to 5°F | 22 km |
| 98952 | 7a | 0 to 5°F | 32 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 USC00458959, at 46.4353, -120.4203, elevation 256 m (841 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 127.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Yakima Air Terminal (18 km)
- Yakima #2 (20 km)
- Moxee City 10 E (21 km)
- Selah 2 NE (27 km)
- Sunnyside #2 (32 km)
- Sunnyside (34 km)
- Priest Rapids Dam (46 km)
- Bickleton (49 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.