Last frost date in Round Lake Beach, IL

Average last frost
April 24

In Round Lake Beach, the last spring frost comes around April 24 in an average year. Wait until May 9 if you want 90% odds of no more frost. The first fall frost usually arrives about October 23, which leaves 180 frost-free days. An early freeze before October 8 happens one year in ten.

Safe after (10% risk)
May 9
Average first frost
Oct 23
Frost-free season
180 days
Hard freeze (28°F) ends
Apr 13
Next 7 nights in Round Lake Beach

No frost in the next 7 nights

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

  1. ThuOct 2246°
  2. FriOct 2347°
  3. SatOct 2451°
  4. SunOct 2550°
  5. MonOct 2647°
  6. TueOct 2744°
  7. WedOct 2845°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 24First frost Oct 23180 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND180 frost-free days
Frost risk through the year at Lake Villa 2NE, 3.5 miles from Round Lake Beach.

Planting calendar for Round Lake Beach

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
TomatoesMay 1–May 15
PumpkinsMay 8–May 22
SunflowersApr 24–May 15
CucumbersMay 8–May 15
CornMay 1–May 15
Sweet potatoesMay 15–May 29
WatermelonMay 8–May 22
Green beansMay 1–May 22
ZucchiniMay 1–May 15
OkraMay 15–May 29
PeppersMay 8–May 22
BasilMay 1–May 15
Butternut squashMay 1–May 15
CantaloupeMay 8–May 22
EggplantMay 8–May 22
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 27–Apr 10
OnionsMar 13–Apr 3
CarrotsApr 3–May 8
LettuceApr 10–May 1
BroccoliMar 27–Apr 10
BeetsMar 27–May 8
PeasMar 13–Mar 27
CabbageMar 27–Apr 10
RadishesMar 20–May 1
Brussels sproutsApr 10–Apr 24
SpinachMar 13–Apr 3
CilantroApr 10–May 1
KaleMar 27–Apr 10
Collard greensMar 27–Apr 10
TurnipsMar 27–Apr 10
DillApr 24–May 8
CeleryMay 1–May 8
CauliflowerApr 10–Apr 24
LeeksApr 10–Apr 24
Swiss chardApr 10–May 8
ParsleyApr 10–May 1
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 9–Nov 13
GarlicOct 2–Nov 6
Daffodil bulbsSep 25–Nov 6
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 27–Apr 10
AsparagusMar 27–Apr 10

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 11Apr 24May 9Oct 8Oct 23Nov 4
Hard freeze, 28°FMar 31Apr 13Apr 28Oct 20Nov 3Nov 16

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 Lake Villa 2NE (USC00114837) sits 3.5 miles from the center of Round Lake Beach at 840 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 Round Lake Beach, IL?

The average last frost date in Round Lake Beach is April 24, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 9.

When is the first frost in Round Lake Beach?

The first frost in fall usually comes around October 23. One year in ten it arrives before October 8.

How long is the growing season in Round Lake Beach?

About 180 days between the average last and first frost.

When should I plant tomatoes in Round Lake Beach?

Plant tomato seedlings outside from May 1 to May 15. Start seeds indoors six to eight weeks earlier.

Nearby in Illinois

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