Frost dates for Fort Clatsop National Mem, OR
At Fort Clatsop National Mem, the median last spring frost (32°F) is Mar 30 and the median first fall frost is Nov 18, for a typical growing season of 233 days. For a 90% chance that the last frost has passed, wait until Apr 28. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 30Last spring frost (median)50% chance of 32°F after this date
- Apr 28Safer planting date10% chance of 32°F after this date
- Nov 18First 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 | Apr 11 | Apr 30 | May 31 |
| 32°F | Feb 26 | Mar 30 | Apr 28 |
| 28°F | Dec 19 | Feb 12 | Mar 9 |
| 24°F | Dec 2 | Jan 4 | Feb 14 |
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 6 | Oct 25 | Nov 13 |
| 32°F | Oct 27 | Nov 18 | Dec 16 |
| 28°F | Nov 13 | Dec 13 | Feb 4 |
| 24°F | Nov 24 | Dec 21 | Feb 6 |
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 | 177 days | 205 days |
| 32°F | 199 days | 233 days | 273 days |
| 28°F | 267 days | 312 days | 360 days |
| 24°F | 317 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 92% |
| 24°F | 47% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97146 | 9a | 20 to 25°F | 3 km |
| 97103 | 8b | 15 to 20°F | 14 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 USC00353014, at 46.1358, -123.8783, elevation 13 m (42 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 31.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Astoria Regional Airport (2 km)
- Seaside (17 km)
- Clatskanie (52 km)
- Vernonia #2 (61 km)
- Tillamook (76 km)
- Tillamook 6se (79 km)
- Saint Helens Rfd (84 km)
- Scappoose Ind Airport (88 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.