Frost dates for Willits 1 NE, CA
At Willits 1 NE, the median last spring frost (32°F) is May 5 and the median first fall frost is Oct 9, for a typical growing season of 157 days. For a 90% chance that the last frost has passed, wait until May 31. Nearby ZIP codes are in USDA hardiness zones 9a to 9b.
- May 5Last spring frost (median)50% chance of 32°F after this date
- May 31Safer planting date10% chance of 32°F after this date
- Oct 9First fall frost (median)50% chance of 32°F by this date
- 157 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 14 | Jun 1 | Jun 23 |
| 32°F | Apr 11 | May 5 | May 31 |
| 28°F | Feb 18 | Mar 31 | Apr 23 |
| 24°F | Dec 20 | Feb 11 | Mar 26 |
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 1 | Sep 20 | Oct 7 |
| 32°F | Sep 24 | Oct 9 | Oct 31 |
| 28°F | Oct 8 | Oct 30 | Nov 30 |
| 24°F | Oct 25 | Nov 26 | Jan 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 | 80 days | 107 days | 134 days |
| 32°F | 128 days | 157 days | 187 days |
| 28°F | 178 days | 216 days | 262 days |
| 24°F | 238 days | 293 days | 342 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 94% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95490 | 9a | 20 to 25°F | 7 km |
| 95427 | 9b | 25 to 30°F | 27 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 USC00049684, at 39.4194, -123.3425, elevation 412 m (1,353 ft).
- Data quality: Representative (10+ years), 14 years of freeze data.
- Average days per year at or below 32°F: 95.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Potter Valley Powerhouse (19 km)
- Ukiah (32 km)
- Ukiah Muni Airport (35 km)
- Fort Bragg 5 N (37 km)
- Covelo (45 km)
- East Park Rsvr (71 km)
- Stony Gorge Rsvr (72 km)
- Cloverdale (75 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.