Frost dates for Seattle Sand Point Wsfo, WA
At Seattle Sand Point Wsfo, the median last spring frost (32°F) is Mar 8 and the median first fall frost is Nov 23, for a typical growing season of 259 days. For a 90% chance that the last frost has passed, wait until Mar 29. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 8Last spring frost (median)50% chance of 32°F after this date
- Mar 29Safer planting date10% chance of 32°F after this date
- Nov 23First fall frost (median)50% chance of 32°F by this date
- 259 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 17 | Apr 4 | Apr 26 |
| 32°F | Feb 13 | Mar 8 | Mar 29 |
| 28°F | Dec 27 | Feb 11 | Mar 1 |
| 24°F | Dec 3 | Jan 9 | Feb 20 |
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 24 | Nov 5 | Nov 22 |
| 32°F | Nov 4 | Nov 23 | Dec 16 |
| 28°F | Nov 17 | Dec 11 | Jan 17 |
| 24°F | Nov 27 | Dec 24 | Feb 8 |
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 | 191 days | 215 days | 237 days |
| 32°F | 231 days | 259 days | 289 days |
| 28°F | 273 days | 308 days | 348 days |
| 24°F | 312 days | 353 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 96% |
| 24°F | 58% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98115 | 9a | 20 to 25°F | 2 km |
| 98105 | 9a | 20 to 25°F | 4 km |
| 98034 | 9a | 20 to 25°F | 4 km |
| 98125 | 9a | 20 to 25°F | 5 km |
| 98033 | 9a | 20 to 25°F | 5 km |
| 98195 | 9a | 20 to 25°F | 5 km |
| 98039 | 9a | 20 to 25°F | 6 km |
| 98112 | 9a | 20 to 25°F | 6 km |
| 98103 | 9a | 20 to 25°F | 6 km |
| 98028 | 9a | 20 to 25°F | 7 km |
| 98102 | 9a | 20 to 25°F | 8 km |
| 98155 | 9a | 20 to 25°F | 8 km |
| 98004 | 9a | 20 to 25°F | 9 km |
| 98133 | 9a | 20 to 25°F | 9 km |
| 98011 | 8b | 15 to 20°F | 9 km |
| 98109 | 9a | 20 to 25°F | 9 km |
| 98107 | 9a | 20 to 25°F | 9 km |
| 98117 | 9a | 20 to 25°F | 10 km |
| 98052 | 8b | 15 to 20°F | 10 km |
| 98119 | 9a | 20 to 25°F | 10 km |
| 98005 | 9a | 20 to 25°F | 11 km |
| 98177 | 9a | 20 to 25°F | 11 km |
| 98007 | 8b | 15 to 20°F | 12 km |
| 98199 | 9a | 20 to 25°F | 12 km |
| 98021 | 8b | 15 to 20°F | 12 km |
| 98072 | 8b | 15 to 20°F | 12 km |
| 98043 | 9a | 20 to 25°F | 12 km |
| 98008 | 8b | 15 to 20°F | 14 km |
| 98074 | 8b | 15 to 20°F | 17 km |
| 98053 | 8b | 15 to 20°F | 18 km |
| 98342 | 9a | 20 to 25°F | 21 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 USW00094290, at 47.6872, -122.2553, elevation 18 m (60 ft).
- Data quality: Standard (24+ years of data), 29 years of freeze data.
- Average days per year at or below 32°F: 25.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Seattle Boeing Field (18 km)
- Renton Muni Airport (22 km)
- Everett Snohomish Airport (25 km)
- Monroe (26 km)
- Seattle Tacoma Intl Airport (27 km)
- Kent (30 km)
- Everett (32 km)
- Bremerton (35 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.