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USDA 2023 hardiness zone · NOAA 1991–2020 frost dates

Frost dates in USDA zone 8a (10 to 15°F)

USDA zone 8a covers places whose coldest winter night averages 10 to 15°F. Across the 546 NOAA weather stations in zone 8a, the median last spring frost is Mar 30, but it ranges from Mar 20 to Apr 11 for most stations. Enter your ZIP for your local date.

  • Mar 30Median last spring frostmost stations Mar 20–Apr 11
  • Nov 6Median first fall frost50% chance of 32°F by this date
  • 222 daysMedian growing seasonbetween 32°F freezes
  • 3,430ZIP codes in zone 8a10 to 15°F average coldest night
  • 546Stations with frost datesof 546 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 8a

Earliest median last spring frost, zone 8a
StationLast spring frostFirst fall frost
Balch Power House, CAFeb 23Dec 12
Alamogordo, NMMar 9Nov 18
Des Arc, ARMar 11Nov 14
Elephant Butte Dam, NMMar 13Nov 15
Coleman, TXMar 14Nov 20
Paris, TXMar 14Nov 16
Penwell, TXMar 14Nov 14
Pine Bluff, ARMar 14Nov 16
Sherman, TXMar 14Nov 19
Tunica 2 N, MSMar 14Nov 15
Latest median last spring frost, zone 8a
StationLast spring frostFirst fall frost
Howard Prairie Dam, ORJun 8Sep 24
Holden Village, WAMay 25Sep 19
Longmire Rainier NPS, WAMay 22Oct 3
Lake Spaulding, CAMay 22Oct 16
Callahan, CAMay 20Oct 5
Prospect 2 SW, ORMay 19Oct 3
Diamond M Rch, AZMay 17Oct 10
Wrightwood, CAMay 16Oct 13
Idyllwild Fire Dept, CAMay 16Oct 24
Mount Shasta, CAMay 15Oct 6

Zone 8a by state

Zone 8a stations by state
StateStationsMedian last frostMedian first frost
Alabama48Mar 29Nov 3
Alaska5Apr 18Oct 25
Arizona13Apr 20Oct 27
Arkansas61Mar 26Nov 6
California13May 5Oct 24
Delaware1Mar 29Nov 14
Georgia41Mar 31Nov 5
Maryland7Mar 29Nov 15
Mississippi27Mar 28Nov 5
Nevada2Apr 7Nov 1
New Jersey2Mar 29Nov 15
New Mexico25Apr 2Nov 6
North Carolina82Mar 31Nov 5
Oklahoma30Mar 29Nov 5
Oregon5May 6Oct 8
South Carolina46Mar 31Nov 4
Tennessee10Mar 28Nov 5
Texas99Mar 28Nov 7
Utah3Mar 25Nov 9
Virginia12Mar 31Nov 10
Washington14Apr 16Oct 25

Neighboring zones

  • Zone 7b (5 to 10°F): median last frost Apr 7
  • Zone 8b (15 to 20°F): median last frost Mar 19

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.