Frost dates for Grizzly Creek State Park, CA
At Grizzly Creek State Park, the median last spring frost (32°F) is Mar 4 and the median first fall frost is Nov 22, for a typical growing season of 264 days. For a 90% chance that the last frost has passed, wait until Apr 8. Nearby ZIP codes are in USDA hardiness zones 8b to 9b.
- Mar 4Last spring frost (median)50% chance of 32°F after this date
- Apr 8Safer planting date10% chance of 32°F after this date
- Nov 22First fall frost (median)50% chance of 32°F by this date
- 264 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 14 | Apr 8 | Apr 26 |
| 32°F | Jan 27 | Mar 4 | Apr 8 |
| 28°F | Dec 6 | Jan 19 | Feb 28 |
| 24°F | Nov 30 | Dec 25 | Jan 31 |
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 19 | Nov 5 | Nov 23 |
| 32°F | Nov 1 | Nov 22 | Dec 15 |
| 28°F | Nov 16 | Dec 8 | Jan 24 |
| 24°F | Nov 26 | Dec 16 | Jan 20 |
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 | 184 days | 210 days | 241 days |
| 32°F | 223 days | 264 days | 309 days |
| 28°F | 285 days | 330 days | 365 days |
| 24°F | 334 days | 365 days | 365 days |
Chance of a freeze in any year
| Temperature | Chance per year |
|---|---|
| 36°F | 100% |
| 32°F | 100% |
| 28°F | 84% |
| 24°F | 37% |
ZIP codes whose closest station is this one
| ZIP | Hardiness zone | Avg. extreme low | Distance |
|---|---|---|---|
| 95528 | 9b | 25 to 30°F | 2 km |
| 95571 | 9b | 25 to 30°F | 14 km |
| 95569 | 9b | 25 to 30°F | 14 km |
| 95526 | 9a | 20 to 25°F | 20 km |
| 95549 | 9b | 25 to 30°F | 20 km |
| 95554 | 9b | 25 to 30°F | 24 km |
| 95514 | 9a | 20 to 25°F | 30 km |
| 95552 | 8b | 15 to 20°F | 45 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 USC00043647, at 40.4864, -123.9089, elevation 126 m (413 ft).
- Data quality: Representative (10+ years), 11 years of freeze data.
- Average days per year at or below 32°F: 23.
- Frost risk changes over short distances. Valleys and low spots freeze earlier than hillsides and city centers.
Nearby weather stations
- Scotia (16 km)
- Eureka WFO Woodley Island (42 km)
- Richardson Gr State Park (52 km)
- Shelter Cove Aviation (52 km)
- Arcata Eureka Airport (57 km)
- Big Bar 4 E (66 km)
- Weaverville (86 km)
- Covelo (94 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.