Frost dates for Modesto City Co Airport, CA
At Modesto City Co Airport, the median last spring frost (32°F) is Jan 31 and the median first fall frost is Dec 5, for a typical growing season of 312 days. For a 90% chance that the last frost has passed, wait until Feb 25. Nearby ZIP codes are in USDA hardiness zone 9b.
- Jan 31Last spring frost (median)50% chance of 32°F after this date
- Feb 25Safer planting date10% chance of 32°F after this date
- Dec 5First fall frost (median)50% chance of 32°F by this date
- 312 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 | Feb 3 | Mar 1 | Mar 31 |
| 32°F | Dec 31 | Jan 31 | Feb 25 |
| 28°F | Dec 16 | Jan 8 | Feb 6 |
| 24°F | Dec 13 | Jan 1 | Jan 22 |
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 | Nov 8 | Nov 22 | Dec 9 |
| 32°F | Nov 20 | Dec 5 | Jan 6 |
| 28°F | Dec 1 | Dec 21 | Jan 20 |
| 24°F | Dec 5 | Dec 27 | Jan 15 |
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 | 231 days | 262 days | 294 days |
| 32°F | 279 days | 312 days | 343 days |
| 28°F | 321 days | 352 days | 365 days |
| 24°F | 351 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 97% |
| 28°F | 68% |
| 24°F | 20% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95354 | 9b | 25 to 30°F | 2 km |
| 95351 | 9b | 25 to 30°F | 4 km |
| 95355 | 9b | 25 to 30°F | 5 km |
| 95319 | 9b | 25 to 30°F | 6 km |
| 95350 | 9b | 25 to 30°F | 7 km |
| 95307 | 9b | 25 to 30°F | 8 km |
| 95357 | 9b | 25 to 30°F | 8 km |
| 95328 | 9b | 25 to 30°F | 8 km |
| 95326 | 9b | 25 to 30°F | 9 km |
| 95367 | 9b | 25 to 30°F | 12 km |
| 95356 | 9b | 25 to 30°F | 13 km |
| 95358 | 9b | 25 to 30°F | 14 km |
| 95368 | 9b | 25 to 30°F | 15 km |
| 95361 | 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 USW00023258, at 37.6242, -120.9506, elevation 22 m (73 ft).
- Data quality: Representative (10+ years), 20 years of freeze data.
- Average days per year at or below 32°F: 12.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Turlock #2 (16 km)
- Tracy Carbona (35 km)
- Stockton Metro Airport (38 km)
- Newman (39 km)
- Merced 23 WSW (43 km)
- Stockton Fire Station 4 (53 km)
- Merced (54 km)
- Merced Muni Airport (54 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.