Frost dates for Keno, OR
At Keno, the median last spring frost (32°F) is Jun 5 and the median first fall frost is Sep 20, for a typical growing season of 107 days. For a 90% chance that the last frost has passed, wait until Jun 22. Nearby ZIP codes are in USDA hardiness zone 6b.
- Jun 5Last spring frost (median)50% chance of 32°F after this date
- Jun 22Safer planting date10% chance of 32°F after this date
- Sep 20First fall frost (median)50% chance of 32°F by this date
- 107 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 | Jun 5 | Jun 21 | Jul 8 |
| 32°F | May 16 | Jun 5 | Jun 22 |
| 28°F | Apr 29 | May 14 | Jun 7 |
| 24°F | Apr 9 | Apr 26 | May 14 |
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 24 | Sep 8 | Sep 19 |
| 32°F | Sep 6 | Sep 20 | Oct 4 |
| 28°F | Sep 19 | Oct 4 | Oct 20 |
| 24°F | Oct 3 | Oct 19 | Nov 8 |
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 | 52 days | 78 days | 98 days |
| 32°F | 84 days | 107 days | 129 days |
| 28°F | 114 days | 142 days | 167 days |
| 24°F | 152 days | 178 days | 200 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 100% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 97627 | 6b | -5 to 0°F | 14 km |
| 96023 | 6b | -5 to 0°F | 22 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 USC00354403, at 42.0944, -121.9022, elevation 1258 m (4,128 ft).
- Data quality: Estimated from nearby stations (2+ years), 9 years of freeze data.
- Average days per year at or below 32°F: 189.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Klamath Falls Intl Airport (16 km)
- Howard Prairie Dam (42 km)
- Gerber Dam (65 km)
- Chiloquin 12 NW (fort Klamath) (68 km)
- Ashland (68 km)
- Medford Rogue Valley Airport (86 km)
- Prospect 2 SW (87 km)
- Lost Creek Dam (90 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.