Frost dates for Olga 2 SE, WA
At Olga 2 SE, the median last spring frost (32°F) is Feb 26 and the median first fall frost is Nov 29, for a typical growing season of 276 days. For a 90% chance that the last frost has passed, wait until Mar 23. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Feb 26Last spring frost (median)50% chance of 32°F after this date
- Mar 23Safer planting date10% chance of 32°F after this date
- Nov 29First fall frost (median)50% chance of 32°F by this date
- 276 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 5 | Mar 29 | Apr 21 |
| 32°F | Jan 23 | Feb 26 | Mar 23 |
| 28°F | Dec 19 | Jan 26 | Feb 26 |
| 24°F | Dec 4 | Jan 9 | Feb 9 |
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 20 | Nov 10 | Nov 28 |
| 32°F | Nov 10 | Nov 29 | Dec 23 |
| 28°F | Nov 22 | Dec 14 | Jan 22 |
| 24°F | Nov 27 | Dec 23 | Jan 29 |
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 | 196 days | 226 days | 257 days |
| 32°F | 242 days | 276 days | 315 days |
| 28°F | 283 days | 328 days | 364 days |
| 24°F | 319 days | 360 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 90% |
| 24°F | 60% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 98279 | 8b | 15 to 20°F | 3 km |
| 98222 | 9a | 20 to 25°F | 5 km |
| 98280 | 9a | 20 to 25°F | 6 km |
| 98245 | 9a | 20 to 25°F | 10 km |
| 98297 | 9a | 20 to 25°F | 19 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 USC00456096, at 48.6117, -122.8064, elevation 24 m (80 ft).
- Data quality: Representative (10+ years), 24 years of freeze data.
- Average days per year at or below 32°F: 32.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Anacortes (18 km)
- Friday Harbor Airport (19 km)
- Bellingham 3 SSW (25 km)
- Bellingham Intl Airport (28 km)
- Whidbey Island NAS (31 km)
- Mount Vernon 3 WNW (36 km)
- Blaine (41 km)
- Sedro-Woolley (44 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.