Frost dates for Covelo, CA
At Covelo, the median last spring frost (32°F) is Apr 23 and the median first fall frost is Oct 19, for a typical growing season of 179 days. For a 90% chance that the last frost has passed, wait until May 11. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Apr 23Last spring frost (median)50% chance of 32°F after this date
- May 11Safer planting date10% chance of 32°F after this date
- Oct 19First fall frost (median)50% chance of 32°F by this date
- 179 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 26 | May 13 | Jun 4 |
| 32°F | Apr 4 | Apr 23 | May 11 |
| 28°F | Feb 27 | Mar 29 | Apr 18 |
| 24°F | Dec 31 | Feb 18 | Mar 17 |
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 21 | Oct 4 | Oct 23 |
| 32°F | Oct 2 | Oct 19 | Nov 8 |
| 28°F | Oct 14 | Nov 3 | Nov 28 |
| 24°F | Oct 29 | Nov 25 | Dec 31 |
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 | 115 days | 141 days | 167 days |
| 32°F | 153 days | 179 days | 204 days |
| 28°F | 188 days | 220 days | 257 days |
| 24°F | 238 days | 282 days | 326 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 99% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95428 | 9a | 20 to 25°F | 6 km |
| 95429 | 9a | 20 to 25°F | 12 km |
| 95454 | 9a | 20 to 25°F | 22 km |
| 95595 | 8b | 15 to 20°F | 31 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 USC00042081, at 39.8158, -123.2444, elevation 431 m (1,413 ft).
- Data quality: Representative (10+ years), 21 years of freeze data.
- Average days per year at or below 32°F: 76.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Willits 1 NE (45 km)
- Potter Valley Powerhouse (51 km)
- Richardson Gr State Park (52 km)
- Fort Bragg 5 N (56 km)
- Stony Gorge Rsvr (66 km)
- Ukiah (74 km)
- Shelter Cove Aviation (75 km)
- Ukiah Muni Airport (77 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.