Last frost date in Florissant, MO

Average last frost
April 2

Expect the last frost in Florissant around April 2. Frost after April 17 happens in only one year out of ten. The first fall frost usually arrives about November 4, which leaves 215 frost-free days. An early freeze before October 23 happens one year in ten.

Safe after (10% risk)
Apr 17
Average first frost
Nov 4
Frost-free season
215 days
Hard freeze (28°F) ends
Mar 23
Next 7 nights in Florissant

No frost in the next 7 nights

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

  1. ThuOct 2250°
  2. FriOct 2349°
  3. SatOct 2452°
  4. SunOct 2553°
  5. MonOct 2652°
  6. TueOct 2749°
  7. WedOct 2850°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 2First frost Nov 4215 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND215 frost-free days
Frost risk through the year at St Louis Lambert International Airport, 4.1 miles from Florissant.

Planting calendar for Florissant

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 9–Apr 23
PumpkinsApr 16–Apr 30
SunflowersApr 2–Apr 23
CucumbersApr 16–Apr 23
CornApr 9–Apr 23
Sweet potatoesApr 23–May 7
WatermelonApr 16–Apr 30
Green beansApr 9–Apr 30
ZucchiniApr 9–Apr 23
OkraApr 23–May 7
PeppersApr 16–Apr 30
BasilApr 9–Apr 23
Butternut squashApr 9–Apr 23
CantaloupeApr 16–Apr 30
EggplantApr 16–Apr 30
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 5–Mar 19
OnionsFeb 19–Mar 12
CarrotsMar 12–Apr 16
LettuceMar 19–Apr 9
BroccoliMar 5–Mar 19
BeetsMar 5–Apr 16
PeasFeb 19–Mar 5
CabbageMar 5–Mar 19
RadishesFeb 26–Apr 9
Brussels sproutsMar 19–Apr 2
SpinachFeb 19–Mar 12
CilantroMar 19–Apr 9
KaleMar 5–Mar 19
Collard greensMar 5–Mar 19
TurnipsMar 5–Mar 19
DillApr 2–Apr 16
CeleryApr 9–Apr 16
CauliflowerMar 19–Apr 2
LeeksMar 19–Apr 2
Swiss chardMar 19–Apr 16
ParsleyMar 19–Apr 9
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 21–Nov 25
GarlicOct 14–Nov 18
Daffodil bulbsOct 7–Nov 18
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 5–Mar 19
AsparagusMar 5–Mar 19

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FMar 17Apr 2Apr 17Oct 23Nov 4Nov 18
Hard freeze, 28°FMar 5Mar 23Apr 7Nov 2Nov 13Nov 30

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 St Louis Lambert International Airport (USW00013994) sits 4.1 miles from the center of Florissant at 531 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 Florissant, MO?

The average last frost date in Florissant is April 2, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 17.

When is the first frost in Florissant?

The first frost in fall usually comes around November 4. One year in ten it arrives before October 23.

How long is the growing season in Florissant?

About 215 days between the average last and first frost.

When should I plant tomatoes in Florissant?

Plant tomato seedlings outside from April 9 to April 23. Start seeds indoors six to eight weeks earlier.

Nearby in Missouri

All 41 cities in Missouri