Frost dates in USDA zone 12b (55 to 60°F)
USDA zone 12b covers places whose coldest winter night averages 55 to 60°F. 1 of 38 stations record a 32°F freeze in at least half of years; for the rest, frost is rare or absent. Enter your ZIP for your local date.
- 137ZIP codes in zone 12b55 to 60°F average coldest night
- 1Stations with frost datesof 38 NOAA stations matched
Stations in zone 12b with a 32°F frost date
| Station | Last spring frost | First fall frost |
|---|---|---|
| Kanalohuluhulu 1075, HI | Jan 26 | Jan 24 |
Zone 12b by state
| State | Stations | With frost dates |
|---|---|---|
| Hawaii | 29 | 1 |
| Puerto Rico | 9 | 0 |
Neighboring zones
How these numbers are made
Each ZIP code gets one zone from the USDA-ARS / PRISM 2023 ZIP tables, which use the map’s 1991–2020 average of the coldest winter night of each year. A ZIP code can span more than one zone, and USDA’s own lookup works by ZIP or address. Each NOAA station is assigned the most common zone among the closest ZIP codes listed on its station page (a tie goes to the zone of the closest of those ZIPs). Frost dates are NOAA’s 50%-probability (median) 32°F dates for each station, the same values shown on the station pages. Zone figures are the median, 10th and 90th percentile across stations; a first fall frost in January to June is counted in the following year.
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.
Sources
- 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.
- 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.
- 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.