Frost dates for Paso Robles, CA
At Paso Robles, the median last spring frost (32°F) is Mar 15 and the median first fall frost is Nov 10, for a typical growing season of 238 days. For a 90% chance that the last frost has passed, wait until Apr 13. Nearby ZIP codes are in USDA hardiness zones 8b to 9a.
- Mar 15Last spring frost (median)50% chance of 32°F after this date
- Apr 13Safer planting date10% chance of 32°F after this date
- Nov 10First fall frost (median)50% chance of 32°F by this date
- 238 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 24 | Apr 18 | May 6 |
| 32°F | Feb 12 | Mar 15 | Apr 13 |
| 28°F | Jan 2 | Feb 9 | Mar 4 |
| 24°F | Dec 13 | Jan 11 | Feb 12 |
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 12 | Oct 27 | Nov 12 |
| 32°F | Oct 23 | Nov 10 | Nov 29 |
| 28°F | Nov 4 | Nov 26 | Dec 19 |
| 24°F | Nov 21 | Dec 8 | Jan 10 |
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 | 165 days | 190 days | 218 days |
| 32°F | 206 days | 238 days | 275 days |
| 28°F | 256 days | 287 days | 326 days |
| 24°F | 300 days | 334 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 100% |
| 24°F | 85% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 93446 | 9a | 20 to 25°F | 5 km |
| 93465 | 9a | 20 to 25°F | 10 km |
| 93432 | 8b | 15 to 20°F | 25 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 USC00046730, at 35.6278, -120.6856, elevation 222 m (730 ft).
- Data quality: Standard (24+ years of data), 28 years of freeze data.
- Average days per year at or below 32°F: 54.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Paso Robles Muni Airport (7 km)
- Morro Bay Fire Dept (32 km)
- San Luis Obispo Poly (36 km)
- San Luis Obispo Airport (44 km)
- Hearst Castle (44 km)
- Pismo Beach (52 km)
- Priest Valley (62 km)
- Coalinga (64 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.