Last frost date in Port St. John, FL

Average last frost
January 25

In Port St. John, the last spring frost comes around January 25 in an average year. Wait until February 24 if you want 90% odds of no more frost. The first fall frost usually arrives about January 13, which leaves 362 frost-free days. An early freeze before December 23 happens one year in ten.

Safe after (10% risk)
Feb 24
Average first frost
Jan 13
Frost-free season
362 days
Hard freeze (28°F) ends
Jan 22
Next 7 nights in Port St. John

No frost in the next 7 nights

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

  1. ThuOct 2265°
  2. FriOct 2368°
  3. SatOct 2470°
  4. SunOct 2571°
  5. MonOct 2669°
  6. TueOct 2768°
  7. WedOct 2868°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Jan 25First frost Jan 13362 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND362 frost-free days
Frost risk through the year at Titusville, 10.3 miles from Port St. John.

Planting calendar for Port St. John

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesFeb 15–Mar 1
PumpkinsFeb 15–Mar 1
SunflowersFeb 15–Mar 8
CucumbersFeb 22–Mar 1
CornFeb 15–Mar 1
Sweet potatoesFeb 15–Mar 1
WatermelonFeb 15–Mar 1
Green beansFeb 15–Mar 8
ZucchiniFeb 15–Mar 1
OkraFeb 15–Mar 1
PeppersFeb 15–Mar 1
BasilFeb 15–Mar 1
Butternut squashFeb 15–Mar 1
CantaloupeFeb 15–Mar 1
EggplantFeb 15–Mar 1
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesDec 28–Jan 11
OnionsDec 14–Jan 4
CarrotsJan 4–Feb 8
LettuceJan 11–Feb 1
BroccoliDec 28–Jan 11
BeetsDec 28–Feb 8
PeasDec 14–Dec 28
CabbageDec 28–Jan 11
RadishesDec 21–Feb 1
Brussels sproutsJan 11–Jan 25
SpinachDec 14–Jan 4
CilantroJan 11–Feb 1
KaleDec 28–Jan 11
Collard greensDec 28–Jan 11
TurnipsDec 28–Jan 11
DillJan 25–Feb 8
CeleryFeb 1–Feb 8
CauliflowerJan 11–Jan 25
LeeksJan 11–Jan 25
Swiss chardJan 11–Feb 8
ParsleyJan 11–Feb 1
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsDec 15–Jan 15
GarlicOct 15–Nov 30
Daffodil bulbsOct 15–Nov 30
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesDec 28–Jan 11
AsparagusDec 28–Jan 11

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FDec 31Jan 25Feb 24Dec 23Jan 13Feb 10
Hard freeze, 28°FDec 27Jan 22Feb 8Dec 25Jan 16Feb 7

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 Titusville (USC00088942) sits 10.3 miles from the center of Port St. John at 16 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 St. John, FL?

The average last frost date in Port St. John is January 25, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after February 24.

When is the first frost in Port St. John?

The first frost in fall usually comes around January 13. One year in ten it arrives before December 23.

How long is the growing season in Port St. John?

About 362 days between the average last and first frost.

When should I plant tomatoes in Port St. John?

Plant tomato seedlings outside from February 15 to March 1. Start seeds indoors six to eight weeks earlier.

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