Frost dates for Astoria Regional Airport, OR
At Astoria Regional Airport, the median last spring frost (32°F) is Mar 26 and the median first fall frost is Nov 11, for a typical growing season of 232 days. For a 90% chance that the last frost has passed, wait until Apr 18. Nearby ZIP codes are in USDA hardiness zone 9a.
- Mar 26Last spring frost (median)50% chance of 32°F after this date
- Apr 18Safer planting date10% chance of 32°F after this date
- Nov 11First fall frost (median)50% chance of 32°F by this date
- 232 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 3 | Apr 25 | May 10 |
| 32°F | Feb 27 | Mar 26 | Apr 18 |
| 28°F | Dec 31 | Feb 18 | Mar 17 |
| 24°F | Dec 2 | Jan 11 | Feb 21 |
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 5 | Oct 23 | Nov 11 |
| 32°F | Oct 22 | Nov 11 | Dec 8 |
| 28°F | Nov 9 | Dec 5 | Jan 30 |
| 24°F | Nov 24 | Dec 20 | Feb 10 |
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 | 156 days | 181 days | 209 days |
| 32°F | 201 days | 232 days | 265 days |
| 28°F | 257 days | 299 days | 345 days |
| 24°F | 313 days | 362 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 | 55% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97121 | 9a | 20 to 25°F | 9 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 USW00094224, at 46.1569, -123.8825, elevation 3 m (9 ft).
- Data quality: Standard (24+ years of data), 28 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 (2 km)
- Seaside (19 km)
- Clatskanie (52 km)
- Vernonia #2 (63 km)
- Tillamook (78 km)
- Tillamook 6se (81 km)
- Saint Helens Rfd (85 km)
- Scappoose Ind Airport (90 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.