Last frost date in Galesburg, IL

Average last frost
April 20

Expect the last frost in Galesburg around April 20. Frost after May 5 happens in only one year out of ten. The first fall frost usually arrives about October 19, which leaves 180 frost-free days. An early freeze before October 4 happens one year in ten.

Safe after (10% risk)
May 5
Average first frost
Oct 19
Frost-free season
180 days
Hard freeze (28°F) ends
Apr 10
Next 7 nights in Galesburg

No frost in the next 7 nights

Later than usual: the average first frost here is October 19.

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

  1. ThuOct 2250°
  2. FriOct 2350°
  3. SatOct 2451°
  4. SunOct 2551°
  5. MonOct 2649°
  6. TueOct 2744°
  7. WedOct 2847°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 20First frost Oct 19180 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND180 frost-free days
Frost risk through the year at Galesburg, 0.5 miles from Galesburg.

Planting calendar for Galesburg

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 27–May 11
PumpkinsMay 4–May 18
SunflowersApr 20–May 11
CucumbersMay 4–May 11
CornApr 27–May 11
Sweet potatoesMay 11–May 25
WatermelonMay 4–May 18
Green beansApr 27–May 18
ZucchiniApr 27–May 11
OkraMay 11–May 25
PeppersMay 4–May 18
BasilApr 27–May 11
Butternut squashApr 27–May 11
CantaloupeMay 4–May 18
EggplantMay 4–May 18
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 23–Apr 6
OnionsMar 9–Mar 30
CarrotsMar 30–May 4
LettuceApr 6–Apr 27
BroccoliMar 23–Apr 6
BeetsMar 23–May 4
PeasMar 9–Mar 23
CabbageMar 23–Apr 6
RadishesMar 16–Apr 27
Brussels sproutsApr 6–Apr 20
SpinachMar 9–Mar 30
CilantroApr 6–Apr 27
KaleMar 23–Apr 6
Collard greensMar 23–Apr 6
TurnipsMar 23–Apr 6
DillApr 20–May 4
CeleryApr 27–May 4
CauliflowerApr 6–Apr 20
LeeksApr 6–Apr 20
Swiss chardApr 6–May 4
ParsleyApr 6–Apr 27
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 5–Nov 9
GarlicSep 28–Nov 2
Daffodil bulbsSep 21–Nov 2
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 23–Apr 6
AsparagusMar 23–Apr 6

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 6Apr 20May 5Oct 4Oct 19Oct 30
Hard freeze, 28°FMar 28Apr 10Apr 24Oct 14Oct 28Nov 8

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 Galesburg (USC00113320) sits 0.5 miles from the center of Galesburg at 761 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 Galesburg, IL?

The average last frost date in Galesburg is April 20, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 5.

When is the first frost in Galesburg?

The first frost in fall usually comes around October 19. One year in ten it arrives before October 4.

How long is the growing season in Galesburg?

About 180 days between the average last and first frost.

When should I plant tomatoes in Galesburg?

Plant tomato seedlings outside from April 27 to May 11. Start seeds indoors six to eight weeks earlier.

Nearby in Illinois

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