Frost dates for Klamath, CA
At Klamath, the median last spring frost (32°F) is Mar 16 and the median first fall frost is Nov 20, for a typical growing season of 252 days. For a 90% chance that the last frost has passed, wait until Apr 20. Nearby ZIP codes are in USDA hardiness zone 9b.
- Mar 16Last spring frost (median)50% chance of 32°F after this date
- Apr 20Safer planting date10% chance of 32°F after this date
- Nov 20First fall frost (median)50% chance of 32°F by this date
- 252 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 | Mar 22 | Apr 21 | Jun 19 |
| 32°F | Feb 8 | Mar 16 | Apr 20 |
| 28°F | Dec 12 | Feb 4 | Mar 15 |
| 24°F | Dec 2 | Dec 27 | Feb 24 |
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 11 | Nov 2 | Nov 23 |
| 32°F | Oct 30 | Nov 20 | Dec 18 |
| 28°F | Nov 13 | Dec 11 | Feb 2 |
| 24°F | Nov 28 | Dec 19 | Feb 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 | 134 days | 194 days | 231 days |
| 32°F | 200 days | 252 days | 295 days |
| 28°F | 265 days | 319 days | 365 days |
| 24°F | 319 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 88% |
| 24°F | 39% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95548 | 9b | 25 to 30°F | 2 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 USC00044577, at 41.5786, -124.0747, elevation 8 m (28 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 26.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Orick Prairie Creek Park (25 km)
- Crescent City McNamara Airport (26 km)
- Crescent City 3 NNW (27 km)
- Orleans (54 km)
- Arcata Eureka Airport (67 km)
- Eureka WFO Woodley Island (86 km)
- Cecilville (92 km)
- Callahan (108 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.