Frost dates for Davenport, WA
At Davenport, the median last spring frost (32°F) is Jun 6 and the median first fall frost is Sep 11, for a typical growing season of 94 days. For a 90% chance that the last frost has passed, wait until Jul 5. Nearby ZIP codes are in USDA hardiness zones 6b to 7a.
- Jun 6Last spring frost (median)50% chance of 32°F after this date
- Jul 5Safer planting date10% chance of 32°F after this date
- Sep 11First fall frost (median)50% chance of 32°F by this date
- 94 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 |
|---|---|---|---|
| 32°F | May 13 | Jun 6 | Jul 5 |
| 28°F | Apr 26 | May 11 | Jun 2 |
| 24°F | Apr 1 | Apr 25 | May 10 |
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 |
|---|---|---|---|
| 32°F | Aug 26 | Sep 11 | Sep 28 |
| 28°F | Sep 9 | Sep 27 | Oct 11 |
| 24°F | Sep 27 | Oct 8 | Oct 29 |
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 | 34 days | 57 days | 84 days |
| 32°F | 66 days | 94 days | 126 days |
| 28°F | 106 days | 137 days | 160 days |
| 24°F | 145 days | 167 days | 194 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 |
|---|---|---|---|
| 99122 | 6b | -5 to 0°F | 5 km |
| 99040 | 7a | 0 to 5°F | 29 km |
| 99129 | 7a | 0 to 5°F | 39 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 USC00452007, at 47.6575, -118.1614, elevation 722 m (2,369 ft).
- Data quality: Standard (24+ years of data), 27 years of freeze data.
- Average days per year at or below 32°F: 175.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Harrington (21 km)
- Spokane WFO (40 km)
- Wilbur (44 km)
- Spokane Intl Airport (48 km)
- Odessa (54 km)
- Spokane 17 SSW (55 km)
- Ritzville 1 SSE (62 km)
- Spokane Felts Field (63 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.