Last frost date in Harrison, NY

Average last frost
April 12

Expect the last frost in Harrison around April 12. Frost after April 27 happens in only one year out of ten. The first fall frost usually arrives about October 31, which leaves 200 frost-free days. An early freeze before October 15 happens one year in ten.

Safe after (10% risk)
Apr 27
Average first frost
Oct 31
Frost-free season
200 days
Hard freeze (28°F) ends
Apr 1
Next 7 nights in Harrison

Frost possible in low spots Fri night, low 36°F

Earlier than usual: the average first frost here is October 31.

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

  1. ThuOct 2240°
  2. FriOct 2336°possible frost
  3. SatOct 2437°
  4. SunOct 2541°
  5. MonOct 2646°
  6. TueOct 2745°
  7. WedOct 2846°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 12First frost Oct 31200 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND200 frost-free days
Frost risk through the year at Westchester County Airport, 3.1 miles from Harrison.

Planting calendar for Harrison

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 19–May 3
PumpkinsApr 26–May 10
SunflowersApr 12–May 3
CucumbersApr 26–May 3
CornApr 19–May 3
Sweet potatoesMay 3–May 17
WatermelonApr 26–May 10
Green beansApr 19–May 10
ZucchiniApr 19–May 3
OkraMay 3–May 17
PeppersApr 26–May 10
BasilApr 19–May 3
Butternut squashApr 19–May 3
CantaloupeApr 26–May 10
EggplantApr 26–May 10
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 15–Mar 29
OnionsMar 1–Mar 22
CarrotsMar 22–Apr 26
LettuceMar 29–Apr 19
BroccoliMar 15–Mar 29
BeetsMar 15–Apr 26
PeasMar 1–Mar 15
CabbageMar 15–Mar 29
RadishesMar 8–Apr 19
Brussels sproutsMar 29–Apr 12
SpinachMar 1–Mar 22
CilantroMar 29–Apr 19
KaleMar 15–Mar 29
Collard greensMar 15–Mar 29
TurnipsMar 15–Mar 29
DillApr 12–Apr 26
CeleryApr 19–Apr 26
CauliflowerMar 29–Apr 12
LeeksMar 29–Apr 12
Swiss chardMar 29–Apr 26
ParsleyMar 29–Apr 19
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 17–Nov 21
GarlicOct 10–Nov 14
Daffodil bulbsOct 3–Nov 14
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 15–Mar 29
AsparagusMar 15–Mar 29

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 1Apr 12Apr 27Oct 15Oct 31Nov 14
Hard freeze, 28°FMar 18Apr 1Apr 13Oct 29Nov 13Nov 29

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 Westchester County Airport (USW00094745) sits 3.1 miles from the center of Harrison at 379 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 Harrison, NY?

The average last frost date in Harrison is April 12, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 27.

When is the first frost in Harrison?

The first frost in fall usually comes around October 31. One year in ten it arrives before October 15.

How long is the growing season in Harrison?

About 200 days between the average last and first frost.

When should I plant tomatoes in Harrison?

Plant tomato seedlings outside from April 19 to May 3. Start seeds indoors six to eight weeks earlier.

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