Climateby Month

Frost dates by ZIP code

Enter a ZIP code to see the typical last spring frost and first fall frost, the dates that are 90% safe, and the NOAA station they come from.

How to read frost dates

A frost date is a probability, not a promise. NOAA computes, for each station, the chance that the last spring freeze (32°F) falls on or after a given date, and the chance that the first fall freeze falls on or before one.

  • Typical date (50%): in half of years the last spring frost is later than this, in half earlier.
  • 1 year in 10: only a 10% chance of frost after this spring date, so planting tender crops after it is 90% safe. In fall, a 10% chance of frost before it.
  • Hard freeze (28°F): cold enough to damage most hardy plants; usually earlier in spring and later in fall than the 32°F dates.

Other publishers use other probabilities. The Old Farmer's Almanac shows 30% dates, which sit between our typical and 1-in-10 dates; some apps show the median. That is why their dates can differ from ours by weeks.

For a ZIP code inside a city on this site we use the city's station. For other ZIP codes we use the closest suitable NOAA station within 25 miles, preferring stations at a similar elevation; the result shows its distance and elevation difference.

Typical last spring frost by state

Range of typical (50%) last spring frost dates across each state's cities
StateEarliest cityLatest cityFrost-free or rare
AlabamaJan 31Mar 240
AlaskaApr 12Jun 60
ArizonaJan 7Jun 46
ArkansasMar 19Apr 150
CaliforniaJan 1Jun 1043
ColoradoApr 30Jun 210
ConnecticutApr 5Apr 260
DelawareMar 29Apr 70
District of ColumbiaMar 24–0
FloridaJan 24Mar 1125
GeorgiaFeb 9Mar 250
Hawaii––7
IdahoApr 24May 130
IllinoisApr 11Apr 260
IndianaApr 4May 10
IowaApr 18Apr 280
KansasApr 4Apr 120
KentuckyMar 31Apr 130
LouisianaJan 24Feb 280
MaineApr 25May 90
MarylandMar 24Apr 100
MassachusettsApr 4May 30
MichiganApr 21May 120
MinnesotaApr 23May 60
MississippiFeb 23Mar 160
MissouriApr 4Apr 100
MontanaMay 10Jun 150
NebraskaApr 18Apr 240
NevadaJan 20Jun 90
New HampshireApr 30May 80
New JerseyApr 1Apr 30
New MexicoMar 12May 190
New YorkMar 30May 270
North CarolinaMar 15Apr 60
North DakotaMay 10May 190
OhioApr 8Apr 240
OklahomaMar 31Apr 40
OregonMar 13Jun 60
PennsylvaniaMar 30Apr 240
Rhode IslandApr 11Apr 110
South CarolinaFeb 4Mar 210
South DakotaMay 1May 280
TennesseeMar 16Apr 170
TexasJan 25Apr 134
UtahMar 14May 290
VermontApr 29May 200
VirginiaMar 16Apr 30
WashingtonMar 8May 100
West VirginiaApr 14Apr 230
WisconsinApr 19May 140
WyomingMay 12Jun 240

Typical (50%) last 32°F frost across the cities listed on each state's frost page (including suburbs covered by a larger city's page); "frost-free or rare" counts cities with no frost or frost in fewer than half of years.

Frost dates by state