Frost dates for Medford Rogue Valley Airport, OR
At Medford Rogue Valley Airport, the median last spring frost (32°F) is Apr 8 and the median first fall frost is Oct 29, for a typical growing season of 204 days. For a 90% chance that the last frost has passed, wait until Apr 30. Nearby ZIP codes are in USDA hardiness zones 8a to 8b.
- Apr 8Last spring frost (median)50% chance of 32°F after this date
- Apr 30Safer planting date10% chance of 32°F after this date
- Oct 29First fall frost (median)50% chance of 32°F by this date
- 204 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 17 |
| 32°F | Mar 17 | Apr 8 | Apr 30 |
| 28°F | Feb 16 | Mar 10 | Apr 3 |
| 24°F | Dec 28 | Feb 10 | Mar 3 |
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 3 | Oct 16 | Oct 29 |
| 32°F | Oct 14 | Oct 29 | Nov 16 |
| 28°F | Oct 26 | Nov 13 | Dec 9 |
| 24°F | Nov 7 | Dec 3 | Jan 7 |
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 | 167 days | 189 days |
| 32°F | 176 days | 204 days | 232 days |
| 28°F | 212 days | 247 days | 283 days |
| 24°F | 262 days | 302 days | 343 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 97% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97502 | 8b | 15 to 20°F | 7 km |
| 97504 | 8b | 15 to 20°F | 9 km |
| 97501 | 8b | 15 to 20°F | 11 km |
| 97525 | 8b | 15 to 20°F | 16 km |
| 97524 | 8a | 10 to 15°F | 21 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 USW00024225, at 42.3811, -122.8722, elevation 395 m (1,297 ft).
- Data quality: Standard (24+ years of data), 26 years of freeze data.
- Average days per year at or below 32°F: 64.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Ruch (23 km)
- Ashland (23 km)
- Lost Creek Dam (36 km)
- Grants Pass (37 km)
- Howard Prairie Dam (44 km)
- Sexton Summit (47 km)
- Prospect 2 SW (49 km)
- Cave Junction 1 WNW (68 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.