Last frost date in Warren, OH

Average last frost
May 8

Expect the last frost in Warren around May 8. Frost after May 25 happens in only one year out of ten. The first fall frost usually arrives about October 12, which leaves 157 frost-free days. An early freeze before September 30 happens one year in ten.

Safe after (10% risk)
May 25
Average first frost
Oct 12
Frost-free season
157 days
Hard freeze (28°F) ends
Apr 27
Next 7 nights in Warren

Frost likely Fri night, low 32°F

National Weather Service forecast, updated Oct 22, 12:57 UTC

  1. ThuOct 2239°
  2. FriOct 2332°frost
  3. SatOct 2433°possible frost
  4. SunOct 2539°
  5. MonOct 2643°
  6. TueOct 2743°
  7. WedOct 2841°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost May 8First frost Oct 12157 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND157 frost-free days
Frost risk through the year at Warren 3 S, 2.6 miles from Warren.

Planting calendar for Warren

Windows count forward or back from the average frost dates above. Click a crop for dates across Ohio.

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMay 15–May 29
PumpkinsMay 22–Jun 5
SunflowersMay 8–May 29
CucumbersMay 22–May 29
CornMay 15–May 29
Sweet potatoesMay 29–Jun 12
WatermelonMay 22–Jun 5
Green beansMay 15–Jun 5
ZucchiniMay 15–May 29
OkraMay 29–Jun 12
PeppersMay 22–Jun 5
BasilMay 15–May 29
Butternut squashMay 15–May 29
CantaloupeMay 22–Jun 5
EggplantMay 22–Jun 5
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 10–Apr 24
OnionsMar 27–Apr 17
CarrotsApr 17–May 22
LettuceApr 24–May 15
BroccoliApr 10–Apr 24
BeetsApr 10–May 22
PeasMar 27–Apr 10
CabbageApr 10–Apr 24
RadishesApr 3–May 15
Brussels sproutsApr 24–May 8
SpinachMar 27–Apr 17
CilantroApr 24–May 15
KaleApr 10–Apr 24
Collard greensApr 10–Apr 24
TurnipsApr 10–Apr 24
DillMay 8–May 22
CeleryMay 15–May 22
CauliflowerApr 24–May 8
LeeksApr 24–May 8
Swiss chardApr 24–May 22
ParsleyApr 24–May 15
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 28–Nov 2
GarlicSep 21–Oct 26
Daffodil bulbsSep 14–Oct 26
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 10–Apr 24
AsparagusApr 10–Apr 24

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 23May 8May 25Sep 30Oct 12Oct 26
Hard freeze, 28°FApr 13Apr 27May 15Oct 8Oct 26Nov 7

Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.

Where these numbers come from

NOAA station Warren 3 S (USC00338769) sits 2.6 miles from the center of Warren at 900 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.

Questions

When is the last frost in Warren, OH?

The average last frost date in Warren is May 8, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 25.

When is the first frost in Warren?

The first frost in fall usually comes around October 12. One year in ten it arrives before September 30.

How long is the growing season in Warren?

About 157 days between the average last and first frost.

When should I plant tomatoes in Warren?

Plant tomato seedlings outside from May 15 to May 29. Start seeds indoors six to eight weeks earlier.

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