Last frost date in Port Huron, MI

Average last frost
April 19

The average last frost in Port Huron is April 19. By May 4 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 3, which leaves 196 frost-free days. An early freeze before October 20 happens one year in ten.

Safe after (10% risk)
May 4
Average first frost
Nov 3
Frost-free season
196 days
Hard freeze (28°F) ends
Apr 7
Next 7 nights in Port Huron

No frost in the next 7 nights

National Weather Service forecast, updated Oct 22, 12:24 UTC

  1. ThuOct 2243°
  2. FriOct 2339°
  3. SatOct 2443°
  4. SunOct 2548°
  5. MonOct 2646°
  6. TueOct 2741°
  7. WedOct 2843°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 19First frost Nov 3196 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND196 frost-free days
Frost risk through the year at Port Huron, 1.5 miles from Port Huron.

Planting calendar for Port Huron

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 26–May 10
PumpkinsMay 3–May 17
SunflowersApr 19–May 10
CucumbersMay 3–May 10
CornApr 26–May 10
Sweet potatoesMay 10–May 24
WatermelonMay 3–May 17
Green beansApr 26–May 17
ZucchiniApr 26–May 10
OkraMay 10–May 24
PeppersMay 3–May 17
BasilApr 26–May 10
Butternut squashApr 26–May 10
CantaloupeMay 3–May 17
EggplantMay 3–May 17
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 22–Apr 5
OnionsMar 8–Mar 29
CarrotsMar 29–May 3
LettuceApr 5–Apr 26
BroccoliMar 22–Apr 5
BeetsMar 22–May 3
PeasMar 8–Mar 22
CabbageMar 22–Apr 5
RadishesMar 15–Apr 26
Brussels sproutsApr 5–Apr 19
SpinachMar 8–Mar 29
CilantroApr 5–Apr 26
KaleMar 22–Apr 5
Collard greensMar 22–Apr 5
TurnipsMar 22–Apr 5
DillApr 19–May 3
CeleryApr 26–May 3
CauliflowerApr 5–Apr 19
LeeksApr 5–Apr 19
Swiss chardApr 5–May 3
ParsleyApr 5–Apr 26
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 20–Nov 24
GarlicOct 13–Nov 17
Daffodil bulbsOct 6–Nov 17
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 22–Apr 5
AsparagusMar 22–Apr 5

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 7Apr 19May 4Oct 20Nov 3Nov 16
Hard freeze, 28°FMar 25Apr 7Apr 21Nov 1Nov 12Nov 28

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 Port Huron (USC00206680) sits 1.5 miles from the center of Port Huron at 590 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 Port Huron, MI?

The average last frost date in Port Huron is April 19, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 4.

When is the first frost in Port Huron?

The first frost in fall usually comes around November 3. One year in ten it arrives before October 20.

How long is the growing season in Port Huron?

About 196 days between the average last and first frost.

When should I plant tomatoes in Port Huron?

Plant tomato seedlings outside from April 26 to May 10. Start seeds indoors six to eight weeks earlier.

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