Frost dates for Kent, WA
At Kent, the median last spring frost (32°F) is Mar 20 and the median first fall frost is Nov 10, for a typical growing season of 233 days. For a 90% chance that the last frost has passed, wait until Apr 8. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 20Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 233 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 26 | Apr 11 | Apr 30 |
| 32°F | Feb 27 | Mar 20 | Apr 8 |
| 28°F | Jan 19 | Feb 25 | Mar 16 |
| 24°F | Dec 8 | Jan 24 | Feb 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 | Oct 13 | Oct 27 | Nov 11 |
| 32°F | Oct 26 | Nov 10 | Nov 26 |
| 28°F | Nov 6 | Nov 24 | Dec 20 |
| 24°F | Nov 16 | Dec 8 | Jan 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 | 175 days | 197 days | 217 days |
| 32°F | 207 days | 233 days | 262 days |
| 28°F | 243 days | 275 days | 314 days |
| 24°F | 285 days | 326 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 88% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98032 | 9a | 20 to 25°F | 3 km |
| 98031 | 8b | 15 to 20°F | 4 km |
| 98055 | 9a | 20 to 25°F | 5 km |
| 98030 | 8b | 15 to 20°F | 7 km |
| 98042 | 8b | 15 to 20°F | 11 km |
| 98001 | 8b | 15 to 20°F | 12 km |
| 98002 | 8b | 15 to 20°F | 12 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 USC00454169, at 47.4172, -122.2433, elevation 9 m (30 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 39.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Seattle Tacoma Intl Airport (6 km)
- Renton Muni Airport (9 km)
- Seattle Boeing Field (13 km)
- Landsburg (22 km)
- Tacoma #1 (23 km)
- Seattle Sand Point Wsfo (30 km)
- Tacoma Narrows Airport (30 km)
- McMillin Rsvr (31 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.