Last frost date in St. George, UT

Average last frost
March 14

The average last frost in St. George is March 14. By April 6 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 10, which leaves 239 frost-free days. An early freeze before October 27 happens one year in ten.

Safe after (10% risk)
Apr 6
Average first frost
Nov 10
Frost-free season
239 days
Hard freeze (28°F) ends
Feb 27
Next 7 nights in St. George

No frost in the next 7 nights

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

  1. ThuOct 2252°
  2. FriOct 2351°
  3. SatOct 2450°
  4. SunOct 2550°
  5. MonOct 2650°
  6. TueOct 2751°
  7. WedOct 2852°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Mar 14First frost Nov 10239 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND239 frost-free days
Frost risk through the year at St George, 3.3 miles from St. George.

Planting calendar for St. George

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMar 21–Apr 4
PumpkinsMar 28–Apr 11
SunflowersMar 14–Apr 4
CucumbersMar 28–Apr 4
CornMar 21–Apr 4
Sweet potatoesApr 4–Apr 18
WatermelonMar 28–Apr 11
Green beansMar 21–Apr 11
ZucchiniMar 21–Apr 4
OkraApr 4–Apr 18
PeppersMar 28–Apr 11
BasilMar 21–Apr 4
Butternut squashMar 21–Apr 4
CantaloupeMar 28–Apr 11
EggplantMar 28–Apr 11
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesFeb 14–Feb 28
OnionsJan 31–Feb 21
CarrotsFeb 21–Mar 28
LettuceFeb 28–Mar 21
BroccoliFeb 14–Feb 28
BeetsFeb 14–Mar 28
PeasJan 31–Feb 14
CabbageFeb 14–Feb 28
RadishesFeb 7–Mar 21
Brussels sproutsFeb 28–Mar 14
SpinachJan 31–Feb 21
CilantroFeb 28–Mar 21
KaleFeb 14–Feb 28
Collard greensFeb 14–Feb 28
TurnipsFeb 14–Feb 28
DillMar 14–Mar 28
CeleryMar 21–Mar 28
CauliflowerFeb 28–Mar 14
LeeksFeb 28–Mar 14
Swiss chardFeb 28–Mar 28
ParsleyFeb 28–Mar 21
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 27–Dec 1
GarlicOct 20–Nov 24
Daffodil bulbsOct 13–Nov 24
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesFeb 14–Feb 28
AsparagusFeb 14–Feb 28

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FFeb 27Mar 14Apr 6Oct 27Nov 10Nov 22
Hard freeze, 28°FFeb 7Feb 27Mar 17Nov 7Nov 20Dec 3

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 George (USC00427516) sits 3.3 miles from the center of St. George at 2,857 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 St. George, UT?

The average last frost date in St. George is March 14, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 6.

When is the first frost in St. George?

The first frost in fall usually comes around November 10. One year in ten it arrives before October 27.

How long is the growing season in St. George?

About 239 days between the average last and first frost.

When should I plant tomatoes in St. George?

Plant tomato seedlings outside from March 21 to April 4. Start seeds indoors six to eight weeks earlier.

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