Frost dates for Seaside, OR
At Seaside, the median last spring frost (32°F) is Apr 2 and the median first fall frost is Nov 12, for a typical growing season of 223 days. For a 90% chance that the last frost has passed, wait until Apr 29. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Apr 2Last spring frost (median)50% chance of 32°F after this date
- Apr 29Safer planting date10% chance of 32°F after this date
- Nov 12First fall frost (median)50% chance of 32°F by this date
- 223 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 5 | Apr 29 | May 16 |
| 32°F | Mar 4 | Apr 2 | Apr 29 |
| 28°F | Dec 31 | Feb 27 | Mar 31 |
| 24°F | Dec 2 | Jan 14 | Mar 1 |
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 30 | Oct 20 | Nov 12 |
| 32°F | Oct 18 | Nov 12 | Dec 6 |
| 28°F | Nov 7 | Dec 4 | Feb 1 |
| 24°F | Nov 25 | Dec 17 | Feb 20 |
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 | 148 days | 176 days | 207 days |
| 32°F | 189 days | 223 days | 264 days |
| 28°F | 240 days | 285 days | 336 days |
| 24°F | 297 days | 351 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 | 59% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97110 | 9a | 20 to 25°F | 11 km |
| 97145 | 9a | 20 to 25°F | 16 km |
| 97138 | 8b | 15 to 20°F | 19 km |
| 97102 | 9a | 20 to 25°F | 22 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 USC00357641, at 45.9869, -123.9236, elevation 3 m (10 ft).
- Data quality: Representative (10+ years), 29 years of freeze data.
- Average days per year at or below 32°F: 29.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Fort Clatsop National Mem (17 km)
- Astoria Regional Airport (19 km)
- Clatskanie (57 km)
- Vernonia #2 (58 km)
- Tillamook (60 km)
- Tillamook 6se (63 km)
- Forest Grove (82 km)
- Saint Helens Rfd (83 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.