Frost dates for Mapleton, OR
At Mapleton, the median last spring frost (32°F) is Feb 15 and the median first fall frost is Dec 9, for a typical growing season of 306 days. For a 90% chance that the last frost has passed, wait until Mar 19. Nearby ZIP codes are in USDA hardiness zone 9a.
- Feb 15Last spring frost (median)50% chance of 32°F after this date
- Mar 19Safer planting date10% chance of 32°F after this date
- Dec 9First fall frost (median)50% chance of 32°F by this date
- 306 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 | Feb 24 | Mar 30 | Apr 29 |
| 32°F | Dec 23 | Feb 15 | Mar 19 |
| 28°F | Dec 9 | Jan 6 | Feb 19 |
| 24°F | Dec 9 | Dec 24 | Jan 15 |
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 22 | Nov 16 | Dec 11 |
| 32°F | Nov 9 | Dec 9 | Jan 24 |
| 28°F | Dec 1 | Dec 25 | Feb 11 |
| 24°F | Dec 8 | Dec 22 | Jan 13 |
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 | 189 days | 231 days | 275 days |
| 32°F | 254 days | 306 days | 357 days |
| 28°F | 323 days | 365 days | 365 days |
| 24°F | 365 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 93% |
| 28°F | 48% |
| 24°F | 13% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97453 | 9a | 20 to 25°F | 6 km |
| 97480 | 9a | 20 to 25°F | 10 km |
| 97430 | 9a | 20 to 25°F | 18 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 USC00355204, at 44.0367, -123.8628, elevation 5 m (17 ft).
- Data quality: Representative (10+ years), 13 years of freeze data.
- Average days per year at or below 32°F: 22.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Florence #2 (19 km)
- Honeyman State Park (23 km)
- Yachats (38 km)
- Fern Ridge-Veneta (39 km)
- Alsea Fh (fall Creek) (42 km)
- Winchester Bay Coast Grd (47 km)
- Elkton 1sw (49 km)
- Eugene Mahlon Sweet Airport (52 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.