Last frost date in Mehlville, MO

Average last frost
April 6

The average last frost in Mehlville is April 6. By April 20 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 27, which leaves 203 frost-free days. An early freeze before October 14 happens one year in ten.

Safe after (10% risk)
Apr 20
Average first frost
Oct 27
Frost-free season
203 days
Hard freeze (28°F) ends
Mar 27
Next 7 nights in Mehlville

No frost in the next 7 nights

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

  1. ThuOct 2249°
  2. FriOct 2347°
  3. SatOct 2450°
  4. SunOct 2551°
  5. MonOct 2650°
  6. TueOct 2748°
  7. WedOct 2849°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 6First frost Oct 27203 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND203 frost-free days
Frost risk through the year at Cahokia, 7.9 miles from Mehlville.

Planting calendar for Mehlville

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesApr 13–Apr 27
PumpkinsApr 20–May 4
SunflowersApr 6–Apr 27
CucumbersApr 20–Apr 27
CornApr 13–Apr 27
Sweet potatoesApr 27–May 11
WatermelonApr 20–May 4
Green beansApr 13–May 4
ZucchiniApr 13–Apr 27
OkraApr 27–May 11
PeppersApr 20–May 4
BasilApr 13–Apr 27
Butternut squashApr 13–Apr 27
CantaloupeApr 20–May 4
EggplantApr 20–May 4
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 9–Mar 23
OnionsFeb 23–Mar 16
CarrotsMar 16–Apr 20
LettuceMar 23–Apr 13
BroccoliMar 9–Mar 23
BeetsMar 9–Apr 20
PeasFeb 23–Mar 9
CabbageMar 9–Mar 23
RadishesMar 2–Apr 13
Brussels sproutsMar 23–Apr 6
SpinachFeb 23–Mar 16
CilantroMar 23–Apr 13
KaleMar 9–Mar 23
Collard greensMar 9–Mar 23
TurnipsMar 9–Mar 23
DillApr 6–Apr 20
CeleryApr 13–Apr 20
CauliflowerMar 23–Apr 6
LeeksMar 23–Apr 6
Swiss chardMar 23–Apr 20
ParsleyMar 23–Apr 13
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 13–Nov 17
GarlicOct 6–Nov 10
Daffodil bulbsSep 29–Nov 10
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 9–Mar 23
AsparagusMar 9–Mar 23

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FMar 22Apr 6Apr 20Oct 14Oct 27Nov 7
Hard freeze, 28°FMar 11Mar 27Apr 10Oct 25Nov 5Nov 23

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 Cahokia (USC00111160) sits 7.9 miles from the center of Mehlville at 400 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 Mehlville, MO?

The average last frost date in Mehlville is April 6, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 20.

When is the first frost in Mehlville?

The first frost in fall usually comes around October 27. One year in ten it arrives before October 14.

How long is the growing season in Mehlville?

About 203 days between the average last and first frost.

When should I plant tomatoes in Mehlville?

Plant tomato seedlings outside from April 13 to April 27. Start seeds indoors six to eight weeks earlier.

Nearby in Missouri

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