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USDA 2023 hardiness zone · NOAA 1991–2020 frost dates

Frost dates in USDA zone 7b (5 to 10°F)

USDA zone 7b covers places whose coldest winter night averages 5 to 10°F. Across the 500 NOAA weather stations in zone 7b, the median last spring frost is Apr 7, but it ranges from Mar 31 to Apr 23 for most stations. Enter your ZIP for your local date.

  • Apr 7Median last spring frostmost stations Mar 31–Apr 23
  • Oct 31Median first fall frost50% chance of 32°F by this date
  • 206 daysMedian growing seasonbetween 32°F freezes
  • 3,855ZIP codes in zone 7b5 to 10°F average coldest night
  • 500Stations with frost datesof 500 NOAA stations matched

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”.

Earliest and latest last-frost stations in zone 7b

Earliest median last spring frost, zone 7b
StationLast spring frostFirst fall frost
Lees Ferry, AZMar 5Nov 19
Harrison, ARMar 22Nov 9
Mc Curtain 1 SE, OKMar 23Nov 5
Caruthersville, MOMar 24Nov 9
Lubbock WFO, TXMar 24Nov 11
Okemah, OKMar 24Nov 9
Byars 3ESE Mesonet, OKMar 25Nov 8
Clarksville 6 NE, ARMar 25Nov 10
Portageville, MOMar 25Nov 7
Margate, NJMar 26Nov 22
Latest median last spring frost, zone 7b
StationLast spring frostFirst fall frost
Mineral, CAJun 10Sep 13
Huntington Lake, CAJun 1Oct 6
Hat Creek, CAMay 29Sep 19
McCloud, CAMay 28Sep 30
Gila Hot Springs, NMMay 26Oct 5
Walnut Creek, AZMay 24Oct 7
Quincy, CAMay 22Sep 25
Goldendale, WAMay 19Sep 25
Canyon Dam, CAMay 18Oct 8
Black River Pumps, AZMay 16Oct 13

Zone 7b by state

Zone 7b stations by state
StateStationsMedian last frostMedian first frost
Alabama9Apr 4Oct 31
Alaska7Apr 29Oct 17
Arizona6Apr 23Oct 24
Arkansas23Apr 4Oct 31
California7May 28Sep 30
Delaware6Apr 7Nov 3
Georgia4Apr 14Oct 26
Kentucky2Apr 2Nov 2
Maryland22Apr 7Nov 3
Massachusetts4Apr 13Nov 3
Mississippi6Apr 4Oct 29
Missouri7Mar 28Nov 3
Nevada7Apr 28Oct 22
New Jersey14Apr 9Nov 2
New Mexico29Apr 20Oct 23
New York16Apr 4Nov 11
North Carolina38Apr 15Oct 26
Oklahoma87Apr 4Nov 2
Oregon10Apr 23Oct 11
Pennsylvania5Apr 2Nov 10
Tennessee107Apr 7Oct 29
Texas18Apr 6Nov 1
Utah8Apr 15Oct 26
Virginia48Apr 8Oct 31
Washington10Apr 23Oct 16

Neighboring zones

  • Zone 7a (0 to 5°F): median last frost Apr 18
  • Zone 8a (10 to 15°F): median last frost Mar 30

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.