Last frost date in Lebanon, PA

Average last frost
April 20

In Lebanon, the last spring frost comes around April 20 in an average year. Wait until May 7 if you want 90% odds of no more frost. The first fall frost usually arrives about October 25, which leaves 185 frost-free days. An early freeze before October 10 happens one year in ten.

Safe after (10% risk)
May 7
Average first frost
Oct 25
Frost-free season
185 days
Hard freeze (28°F) ends
Apr 4
Next 7 nights in Lebanon

Frost likely Fri night, low 32°F

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

  1. ThuOct 2240°
  2. FriOct 2332°frost
  3. SatOct 2434°possible frost
  4. SunOct 2537°
  5. MonOct 2643°
  6. TueOct 2743°
  7. WedOct 2844°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 20First frost Oct 25185 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND185 frost-free days
Frost risk through the year at Lebanon 2 W, 2.4 miles from Lebanon.

Planting calendar for Lebanon

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 27–May 11
PumpkinsMay 4–May 18
SunflowersApr 20–May 11
CucumbersMay 4–May 11
CornApr 27–May 11
Sweet potatoesMay 11–May 25
WatermelonMay 4–May 18
Green beansApr 27–May 18
ZucchiniApr 27–May 11
OkraMay 11–May 25
PeppersMay 4–May 18
BasilApr 27–May 11
Butternut squashApr 27–May 11
CantaloupeMay 4–May 18
EggplantMay 4–May 18
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 23–Apr 6
OnionsMar 9–Mar 30
CarrotsMar 30–May 4
LettuceApr 6–Apr 27
BroccoliMar 23–Apr 6
BeetsMar 23–May 4
PeasMar 9–Mar 23
CabbageMar 23–Apr 6
RadishesMar 16–Apr 27
Brussels sproutsApr 6–Apr 20
SpinachMar 9–Mar 30
CilantroApr 6–Apr 27
KaleMar 23–Apr 6
Collard greensMar 23–Apr 6
TurnipsMar 23–Apr 6
DillApr 20–May 4
CeleryApr 27–May 4
CauliflowerApr 6–Apr 20
LeeksApr 6–Apr 20
Swiss chardApr 6–May 4
ParsleyApr 6–Apr 27
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 11–Nov 15
GarlicOct 4–Nov 8
Daffodil bulbsSep 27–Nov 8
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 23–Apr 6
AsparagusMar 23–Apr 6

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 5Apr 20May 7Oct 10Oct 25Nov 6
Hard freeze, 28°FMar 22Apr 4Apr 18Oct 22Nov 5Nov 20

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 Lebanon 2 W (USC00364896) sits 2.4 miles from the center of Lebanon at 450 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 Lebanon, PA?

The average last frost date in Lebanon is April 20, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 7.

When is the first frost in Lebanon?

The first frost in fall usually comes around October 25. One year in ten it arrives before October 10.

How long is the growing season in Lebanon?

About 185 days between the average last and first frost.

When should I plant tomatoes in Lebanon?

Plant tomato seedlings outside from April 27 to May 11. Start seeds indoors six to eight weeks earlier.

Nearby in Pennsylvania

All 35 cities in Pennsylvania