Last frost date in New Berlin, WI

Average last frost
May 3

Expect the last frost in New Berlin around May 3. Frost after May 19 happens in only one year out of ten. The first fall frost usually arrives about October 14, which leaves 162 frost-free days. An early freeze before September 30 happens one year in ten.

Safe after (10% risk)
May 19
Average first frost
Oct 14
Frost-free season
162 days
Hard freeze (28°F) ends
Apr 21
Next 7 nights in New Berlin

No frost in the next 7 nights

Later than usual: the average first frost here is October 14.

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

  1. ThuOct 2248°
  2. FriOct 2349°
  3. SatOct 2452°
  4. SunOct 2551°
  5. MonOct 2646°
  6. TueOct 2744°
  7. WedOct 2844°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost May 3First frost Oct 14162 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND162 frost-free days
Frost risk through the year at Hales Corners/whitnall Park/bo, 5.6 miles from New Berlin.

Planting calendar for New Berlin

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMay 10–May 24
PumpkinsMay 17–May 31
SunflowersMay 3–May 24
CucumbersMay 17–May 24
CornMay 10–May 24
Sweet potatoesMay 24–Jun 7
WatermelonMay 17–May 31
Green beansMay 10–May 31
ZucchiniMay 10–May 24
OkraMay 24–Jun 7
PeppersMay 17–May 31
BasilMay 10–May 24
Butternut squashMay 10–May 24
CantaloupeMay 17–May 31
EggplantMay 17–May 31
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 5–Apr 19
OnionsMar 22–Apr 12
CarrotsApr 12–May 17
LettuceApr 19–May 10
BroccoliApr 5–Apr 19
BeetsApr 5–May 17
PeasMar 22–Apr 5
CabbageApr 5–Apr 19
RadishesMar 29–May 10
Brussels sproutsApr 19–May 3
SpinachMar 22–Apr 12
CilantroApr 19–May 10
KaleApr 5–Apr 19
Collard greensApr 5–Apr 19
TurnipsApr 5–Apr 19
DillMay 3–May 17
CeleryMay 10–May 17
CauliflowerApr 19–May 3
LeeksApr 19–May 3
Swiss chardApr 19–May 17
ParsleyApr 19–May 10
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 30–Nov 4
GarlicSep 23–Oct 28
Daffodil bulbsSep 16–Oct 28
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 5–Apr 19
AsparagusApr 5–Apr 19

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 18May 3May 19Sep 30Oct 14Oct 26
Hard freeze, 28°FApr 8Apr 21May 9Oct 8Oct 24Nov 6

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 Hales Corners/whitnall Park/bo (USC00473391) sits 5.6 miles from the center of New Berlin at 774 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 New Berlin, WI?

The average last frost date in New Berlin is May 3, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 19.

When is the first frost in New Berlin?

The first frost in fall usually comes around October 14. One year in ten it arrives before September 30.

How long is the growing season in New Berlin?

About 162 days between the average last and first frost.

When should I plant tomatoes in New Berlin?

Plant tomato seedlings outside from May 10 to May 24. Start seeds indoors six to eight weeks earlier.

Nearby in Wisconsin

All 43 cities in Wisconsin