Last frost date in South Holland, IL

Average last frost
April 23

Expect the last frost in South Holland around April 23. Frost after May 11 happens in only one year out of ten. The first fall frost usually arrives about October 20, which leaves 179 frost-free days. An early freeze before October 6 happens one year in ten.

Safe after (10% risk)
May 11
Average first frost
Oct 20
Frost-free season
179 days
Hard freeze (28°F) ends
Apr 12
Next 7 nights in South Holland

No frost in the next 7 nights

Later than usual: the average first frost here is October 20.

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

  1. ThuOct 2247°
  2. FriOct 2348°
  3. SatOct 2451°
  4. SunOct 2552°
  5. MonOct 2650°
  6. TueOct 2747°
  7. WedOct 2847°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 23First frost Oct 20179 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND179 frost-free days
Frost risk through the year at Park Forest, 8.2 miles from South Holland.

Planting calendar for South Holland

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 30–May 14
PumpkinsMay 7–May 21
SunflowersApr 23–May 14
CucumbersMay 7–May 14
CornApr 30–May 14
Sweet potatoesMay 14–May 28
WatermelonMay 7–May 21
Green beansApr 30–May 21
ZucchiniApr 30–May 14
OkraMay 14–May 28
PeppersMay 7–May 21
BasilApr 30–May 14
Butternut squashApr 30–May 14
CantaloupeMay 7–May 21
EggplantMay 7–May 21
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 26–Apr 9
OnionsMar 12–Apr 2
CarrotsApr 2–May 7
LettuceApr 9–Apr 30
BroccoliMar 26–Apr 9
BeetsMar 26–May 7
PeasMar 12–Mar 26
CabbageMar 26–Apr 9
RadishesMar 19–Apr 30
Brussels sproutsApr 9–Apr 23
SpinachMar 12–Apr 2
CilantroApr 9–Apr 30
KaleMar 26–Apr 9
Collard greensMar 26–Apr 9
TurnipsMar 26–Apr 9
DillApr 23–May 7
CeleryApr 30–May 7
CauliflowerApr 9–Apr 23
LeeksApr 9–Apr 23
Swiss chardApr 9–May 7
ParsleyApr 9–Apr 30
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 6–Nov 10
GarlicSep 29–Nov 3
Daffodil bulbsSep 22–Nov 3
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 26–Apr 9
AsparagusMar 26–Apr 9

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 9Apr 23May 11Oct 6Oct 20Nov 1
Hard freeze, 28°FMar 30Apr 12Apr 27Oct 18Oct 30Nov 15

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 Park Forest (USC00116616) sits 8.2 miles from the center of South Holland at 710 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 South Holland, IL?

The average last frost date in South Holland is April 23, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 11.

When is the first frost in South Holland?

The first frost in fall usually comes around October 20. One year in ten it arrives before October 6.

How long is the growing season in South Holland?

About 179 days between the average last and first frost.

When should I plant tomatoes in South Holland?

Plant tomato seedlings outside from April 30 to May 14. Start seeds indoors six to eight weeks earlier.

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