Frost dates for Coos Bay 8 SW, OR
At Coos Bay 8 SW, the median last spring frost (32°F) is Apr 15 and the median first fall frost is Oct 31, for a typical growing season of 199 days. For a 90% chance that the last frost has passed, wait until May 3. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- Apr 15Last spring frost (median)50% chance of 32°F after this date
- May 3Safer planting date10% chance of 32°F after this date
- Oct 31First fall frost (median)50% chance of 32°F by this date
- 199 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 24 | May 8 | Jun 2 |
| 32°F | Mar 23 | Apr 15 | May 3 |
| 28°F | Jan 6 | Feb 27 | Apr 2 |
| 24°F | Dec 3 | Jan 7 | Feb 19 |
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 15 | Oct 5 | Oct 31 |
| 32°F | Oct 8 | Oct 31 | Nov 29 |
| 28°F | Oct 28 | Nov 29 | Jan 7 |
| 24°F | Nov 21 | Dec 21 | Feb 1 |
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 | 120 days | 150 days | 180 days |
| 32°F | 169 days | 199 days | 238 days |
| 28°F | 225 days | 277 days | 334 days |
| 24°F | 313 days | 359 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 98% |
| 24°F | 57% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97423 | 9a | 20 to 25°F | 15 km |
| 97420 | 9a | 20 to 25°F | 19 km |
| 97411 | 9b | 25 to 30°F | 24 km |
| 97459 | 9a | 20 to 25°F | 26 km |
| 97458 | 9a | 20 to 25°F | 35 km |
| 97414 | 9a | 20 to 25°F | 36 km |
| 97449 | 9a | 20 to 25°F | 39 km |
| 97450 | 9a | 20 to 25°F | 41 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 USW00004141, at 43.2717, -124.3186, elevation 4 m (12 ft).
- Data quality: Representative (10+ years), 12 years of freeze data.
- Average days per year at or below 32°F: 54.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Coquille City (13 km)
- Bandon 2 NNE (15 km)
- North Bend Regional Airport (17 km)
- Langlois #2 (40 km)
- Winchester Bay Coast Grd (47 km)
- Powers (47 km)
- Port Orford #2 (60 km)
- Elkton 3 SW (69 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.