Last frost date in West Islip, NY

Average last frost
April 6

Expect the last frost in West Islip around April 6. Frost after April 20 happens in only one year out of ten. The first fall frost usually arrives about November 6, which leaves 213 frost-free days. An early freeze before October 25 happens one year in ten.

Safe after (10% risk)
Apr 20
Average first frost
Nov 6
Frost-free season
213 days
Hard freeze (28°F) ends
Mar 27
Next 7 nights in West Islip

No frost in the next 7 nights

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

  1. ThuOct 2242°
  2. FriOct 2341°
  3. SatOct 2442°
  4. SunOct 2546°
  5. MonOct 2650°
  6. TueOct 2749°
  7. WedOct 2850°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 6First frost Nov 6213 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND213 frost-free days
Frost risk through the year at Farmingdale Airport, 6.7 miles from West Islip.

Planting calendar for West Islip

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 13–Apr 27
PumpkinsApr 20–May 4
SunflowersApr 6–Apr 27
CucumbersApr 20–Apr 27
CornApr 13–Apr 27
Sweet potatoesApr 27–May 11
WatermelonApr 20–May 4
Green beansApr 13–May 4
ZucchiniApr 13–Apr 27
OkraApr 27–May 11
PeppersApr 20–May 4
BasilApr 13–Apr 27
Butternut squashApr 13–Apr 27
CantaloupeApr 20–May 4
EggplantApr 20–May 4
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 9–Mar 23
OnionsFeb 23–Mar 16
CarrotsMar 16–Apr 20
LettuceMar 23–Apr 13
BroccoliMar 9–Mar 23
BeetsMar 9–Apr 20
PeasFeb 23–Mar 9
CabbageMar 9–Mar 23
RadishesMar 2–Apr 13
Brussels sproutsMar 23–Apr 6
SpinachFeb 23–Mar 16
CilantroMar 23–Apr 13
KaleMar 9–Mar 23
Collard greensMar 9–Mar 23
TurnipsMar 9–Mar 23
DillApr 6–Apr 20
CeleryApr 13–Apr 20
CauliflowerMar 23–Apr 6
LeeksMar 23–Apr 6
Swiss chardMar 23–Apr 20
ParsleyMar 23–Apr 13
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 23–Nov 27
GarlicOct 16–Nov 20
Daffodil bulbsOct 9–Nov 20
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 9–Mar 23
AsparagusMar 9–Mar 23

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FMar 26Apr 6Apr 20Oct 25Nov 6Nov 21
Hard freeze, 28°FMar 12Mar 27Apr 6Nov 5Nov 19Dec 5

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 Farmingdale Airport (USW00054787) sits 6.7 miles from the center of West Islip at 81 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 West Islip, NY?

The average last frost date in West Islip is April 6, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 20.

When is the first frost in West Islip?

The first frost in fall usually comes around November 6. One year in ten it arrives before October 25.

How long is the growing season in West Islip?

About 213 days between the average last and first frost.

When should I plant tomatoes in West Islip?

Plant tomato seedlings outside from April 13 to April 27. Start seeds indoors six to eight weeks earlier.

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