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USDA 2023 hardiness zone · NOAA 1991–2020 frost dates

Frost dates in USDA zone 7a (0 to 5°F)

USDA zone 7a covers places whose coldest winter night averages 0 to 5°F. Across the 732 NOAA weather stations in zone 7a, the median last spring frost is Apr 18, but it ranges from Apr 6 to May 9 for most stations. Enter your ZIP for your local date.

  • Apr 18Median last spring frostmost stations Apr 6–May 9
  • Oct 23Median first fall frost50% chance of 32°F by this date
  • 187 daysMedian growing seasonbetween 32°F freezes
  • 4,877ZIP codes in zone 7a0 to 5°F average coldest night
  • 732Stations with frost datesof 738 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 7a

Earliest median last spring frost, zone 7a
StationLast spring frostFirst fall frost
Priest Rapids Dam, WAMar 24Nov 4
Milton Freewater, ORMar 25Oct 29
Eddyville 5S, KYMar 27Nov 8
Walla Walla Regional Airport, WAMar 27Oct 31
Evansville Museum, INMar 29Nov 10
Poplar Bluff, MOMar 29Nov 5
Huntsville 1 SSW, ARMar 30Nov 7
Barnsdall, OKMar 31Oct 31
Kansas 2 NE, OKMar 31Nov 2
Louisville Intl Airport, KYMar 31Nov 7
Latest median last spring frost, zone 7a
StationLast spring frostFirst fall frost
Middlegate-Clifford, NVJun 11Sep 12
Mund's Park, AZJun 10Sep 27
Tahoe City, CAJun 9Sep 25
Manzanita Lake, CAJun 9Sep 21
Enterprise 20 NNE, ORJun 8Sep 5
Davenport, WAJun 6Sep 11
Glenbrook, NVJun 5Oct 9
Fossil, ORJun 3Sep 14
Canby 3 SW, CAJun 1Sep 16
St. George Island Airport, AKMay 31Oct 5

Zone 7a by state

Zone 7a stations by state
StateStationsMedian last frostMedian first frost
Alaska11May 9Oct 5
Arizona21May 4Oct 16
Arkansas10Apr 8Oct 28
California12May 27Oct 1
Colorado9Apr 27Oct 16
Connecticut5Apr 16Oct 28
Idaho24Apr 29Oct 11
Illinois19Apr 7Oct 26
Indiana9Apr 5Oct 31
Kansas29Apr 10Oct 28
Kentucky69Apr 15Oct 25
Maryland10Apr 14Oct 26
Massachusetts14Apr 22Oct 25
Michigan1Apr 27Oct 25
Missouri40Apr 9Oct 26
Nevada19May 7Oct 11
New Jersey24Apr 17Oct 24
New Mexico38Apr 30Oct 15
New York11Apr 20Oct 26
North Carolina22Apr 23Oct 20
Ohio2Apr 23Oct 20
Oklahoma58Apr 10Oct 28
Oregon25May 8Oct 7
Pennsylvania41Apr 19Oct 24
Rhode Island7Apr 11Oct 31
Tennessee28Apr 19Oct 22
Texas32Apr 18Oct 25
Utah24Apr 29Oct 17
Virginia55Apr 22Oct 22
Washington40Apr 28Oct 12
West Virginia29Apr 18Oct 26

Neighboring zones

  • Zone 6b (-5 to 0°F): median last frost Apr 24
  • Zone 7b (5 to 10°F): median last frost Apr 7

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.