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USDA 2023 hardiness zone · NOAA 1991–2020 frost dates

Frost dates in USDA zone 10b (35 to 40°F)

USDA zone 10b covers places whose coldest winter night averages 35 to 40°F. 22 of 55 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.

Your ZIP code’s zone and frost dates

Your ZIP gives your zone and the closest NOAA station, which is a better guide than the zone-wide numbers.

5 digits, for example 20001.

From your seed packet, e.g. “start 6 weeks before last frost”.

  • 752ZIP codes in zone 10b35 to 40°F average coldest night
  • 22Stations with frost datesof 55 NOAA stations matched

Stations in zone 10b with a 32°F frost date

Stations in zone 10b with a 32°F frost date: each station’s median (50%) dates
StationLast spring frostFirst fall frost
Big Sur Station, CAFeb 13Dec 27
Camp Pendleton MCAS, CAFeb 16Dec 8
El Cajon, CAJan 6Dec 21
Everglades, FLJan 16Jan 14
Fort Myers Page Field Airport, FLJan 16Jan 13
Juno Beach, FLJan 26Jan 16
Laguna Beach, CAJan 6Jan 2
Loxahatchee Nwr, FLJan 22Jan 17
Naples, FLJan 18Jan 11
Oasis Ranger Station, FLJan 18Jan 16
Palm Beach Gardens, FLJan 21Jan 15
Point Mugu Nf, CADec 29Dec 24
Port Salerno 5W, FLJan 26Jan 15
Royal Palm Ranger Station, FLJan 20Jan 17
San Diego Brown Field, CAJan 6Dec 31
San Francisco Oceanside, CADec 30Dec 25
San Gabriel Fire Dept, CAJan 4Jan 2
Santa Barbara, CAJan 13Jan 6
St. Petersburg, FLJan 17Jan 15
Stuart, FLJan 23Jan 18
Torrance Airport, CAJan 9Jan 5
Tustin Irvine Rch, CAJan 5Dec 25

Zone 10b by state

Zone 10b stations by state
StateStationsWith frost dates
California3411
Florida2111

Neighboring zones

  • Zone 10a (30 to 35°F): median last frost Jan 19
  • Zone 11a (40 to 45°F): frost rare

All hardiness 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

Freeze dates are 30-year probabilities, not forecasts. Check your local forecast before planting tender plants.