Frost dates for Grants Pass, OR
At Grants Pass, the median last spring frost (32°F) is Apr 8 and the median first fall frost is Oct 28, for a typical growing season of 201 days. For a 90% chance that the last frost has passed, wait until May 1. Nearby ZIP codes are in USDA hardiness zone 8b.
- Apr 8Last spring frost (median)50% chance of 32°F after this date
- May 1Safer planting date10% chance of 32°F after this date
- Oct 28First fall frost (median)50% chance of 32°F by this date
- 201 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 14 | May 2 | May 30 |
| 32°F | Mar 15 | Apr 8 | May 1 |
| 28°F | Jan 19 | Mar 8 | Apr 5 |
| 24°F | Dec 6 | Jan 29 | Mar 8 |
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 23 | Oct 11 | Oct 31 |
| 32°F | Oct 8 | Oct 28 | Nov 24 |
| 28°F | Oct 22 | Nov 16 | Dec 27 |
| 24°F | Nov 3 | Dec 11 | Feb 6 |
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 | 132 days | 160 days | 187 days |
| 32°F | 172 days | 201 days | 234 days |
| 28°F | 213 days | 255 days | 307 days |
| 24°F | 275 days | 323 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 83% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97527 | 8b | 15 to 20°F | 7 km |
| 97543 | 8b | 15 to 20°F | 20 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 USC00353445, at 42.4239, -123.3219, elevation 284 m (932 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 65.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Sexton Summit (20 km)
- Ruch (32 km)
- Medford Rogue Valley Airport (37 km)
- Cave Junction 1 WNW (39 km)
- Ashland (55 km)
- Riddle (59 km)
- Lost Creek Dam (60 km)
- Illahe (64 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.