Frost dates for Rome St. Airport, OR
At Rome St. Airport, the median last spring frost (32°F) is May 26 and the median first fall frost is Sep 21, for a typical growing season of 117 days. For a 90% chance that the last frost has passed, wait until Jun 13. Nearby ZIP codes are in USDA hardiness zones 6a to 7a.
- May 26Last spring frost (median)50% chance of 32°F after this date
- Jun 13Safer planting date10% chance of 32°F after this date
- Sep 21First fall frost (median)50% chance of 32°F by this date
- 117 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 | May 22 | Jun 11 | Jun 29 |
| 32°F | May 8 | May 26 | Jun 13 |
| 28°F | Apr 25 | May 9 | May 29 |
| 24°F | Apr 9 | Apr 28 | May 13 |
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 | Aug 27 | Sep 9 | Sep 23 |
| 32°F | Sep 5 | Sep 21 | Oct 5 |
| 28°F | Sep 18 | Oct 3 | Oct 19 |
| 24°F | Sep 28 | Oct 15 | Nov 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 | 64 days | 89 days | 111 days |
| 32°F | 93 days | 117 days | 140 days |
| 28°F | 121 days | 145 days | 166 days |
| 24°F | 146 days | 169 days | 194 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
Closest ZIP codes (each is closer to another station)
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97910 | 6b | -5 to 0°F | 41 km |
| 97902 | 6b | -5 to 0°F | 47 km |
| 97721 | 6b | -5 to 0°F | 48 km |
| 89421 | 7a | 0 to 5°F | 61 km |
| 97710 | 6b | -5 to 0°F | 74 km |
| 97722 | 6a | -10 to -5°F | 84 km |
| 97736 | 6b | -5 to 0°F | 85 km |
| 97906 | 6b | -5 to 0°F | 97 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 USW00094107, at 42.5906, -117.8644, elevation 1234 m (4,050 ft).
- Data quality: Representative (10+ years), 16 years of freeze data.
- Average days per year at or below 32°F: 172.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Mc Dermitt 26 N (20 km)
- Rome 2 NW (34 km)
- Fields (76 km)
- Sheaville 1 SE (89 km)
- Riverside 7 SSW (100 km)
- Rockville 5 N (105 km)
- Malheur Refuge HQ (110 km)
- Owyhee Dam (128 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.