Frost dates for Hanford Muni Airport, CA
At Hanford Muni Airport, the median last spring frost (32°F) is Feb 20 and the median first fall frost is Nov 23, for a typical growing season of 276 days. For a 90% chance that the last frost has passed, wait until Mar 21. Nearby ZIP codes are in USDA hardiness zone 9b.
- Feb 20Last spring frost (median)50% chance of 32°F after this date
- Mar 21Safer planting date10% chance of 32°F after this date
- Nov 23First fall frost (median)50% chance of 32°F by this date
- 276 daysGrowing season (median)between 32°F freezes
USDA hardiness zone 9b (25 to 30°F) · see all zone 9b frost dates
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 | Feb 25 | Mar 25 | Apr 18 |
| 32°F | Jan 18 | Feb 20 | Mar 21 |
| 28°F | Dec 17 | Jan 19 | Feb 18 |
| 24°F | Dec 10 | Dec 31 | Jan 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 | Oct 24 | Nov 9 | Nov 24 |
| 32°F | Nov 6 | Nov 23 | Dec 12 |
| 28°F | Nov 20 | Dec 5 | Jan 9 |
| 24°F | Dec 1 | Dec 16 | Jan 7 |
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 | 201 days | 229 days | 259 days |
| 32°F | 239 days | 276 days | 314 days |
| 28°F | 290 days | 329 days | 365 days |
| 24°F | 335 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 90% |
| 24°F | 46% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 93673 | 9b | 25 to 30°F | 20 km |
| 93631 | 9b | 25 to 30°F | 21 km |
| 93662 | 9b | 25 to 30°F | 24 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 USW00053119, at 36.3189, -119.6289, elevation 76 m (249 ft).
- Data quality: Representative (10+ years), 19 years of freeze data.
- Average days per year at or below 32°F: 31.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Hanford 1 S (1 km)
- Corcoran Irrig Dist (25 km)
- Lemoore Reeves NAS (29 km)
- Visalia (30 km)
- Kettleman City (46 km)
- Five Points 5 SSW (47 km)
- Fresno 5 NE (50 km)
- Fresno Yosemite Intl Airport (52 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.