Last frost date in South Salt Lake, UT

Average last frost
March 31

Expect the last frost in South Salt Lake around March 31. Frost after April 19 happens in only one year out of ten. The first fall frost usually arrives about November 8, which leaves 224 frost-free days. An early freeze before October 23 happens one year in ten.

Safe after (10% risk)
Apr 19
Average first frost
Nov 8
Frost-free season
224 days
Hard freeze (28°F) ends
Mar 8
Next 7 nights in South Salt Lake

No frost in the next 7 nights

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

  1. ThuOct 2247°
  2. FriOct 2341°
  3. SatOct 2439°
  4. SunOct 2539°
  5. MonOct 2640°
  6. TueOct 2740°
  7. WedOct 2842°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Mar 31First frost Nov 8224 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND224 frost-free days
Frost risk through the year at Salt Lake Triad Center, 4.5 miles from South Salt Lake.

Planting calendar for South Salt Lake

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
TomatoesApr 7–Apr 21
PumpkinsApr 14–Apr 28
SunflowersMar 31–Apr 21
CucumbersApr 14–Apr 21
CornApr 7–Apr 21
Sweet potatoesApr 21–May 5
WatermelonApr 14–Apr 28
Green beansApr 7–Apr 28
ZucchiniApr 7–Apr 21
OkraApr 21–May 5
PeppersApr 14–Apr 28
BasilApr 7–Apr 21
Butternut squashApr 7–Apr 21
CantaloupeApr 14–Apr 28
EggplantApr 14–Apr 28
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesMar 3–Mar 17
OnionsFeb 17–Mar 10
CarrotsMar 10–Apr 14
LettuceMar 17–Apr 7
BroccoliMar 3–Mar 17
BeetsMar 3–Apr 14
PeasFeb 17–Mar 3
CabbageMar 3–Mar 17
RadishesFeb 24–Apr 7
Brussels sproutsMar 17–Mar 31
SpinachFeb 17–Mar 10
CilantroMar 17–Apr 7
KaleMar 3–Mar 17
Collard greensMar 3–Mar 17
TurnipsMar 3–Mar 17
DillMar 31–Apr 14
CeleryApr 7–Apr 14
CauliflowerMar 17–Mar 31
LeeksMar 17–Mar 31
Swiss chardMar 17–Apr 14
ParsleyMar 17–Apr 7
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 25–Nov 29
GarlicOct 18–Nov 22
Daffodil bulbsOct 11–Nov 22
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesMar 3–Mar 17
AsparagusMar 3–Mar 17

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FMar 7Mar 31Apr 19Oct 23Nov 8Nov 25
Hard freeze, 28°FFeb 17Mar 8Apr 2Nov 1Nov 18Dec 6

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 Salt Lake Triad Center (USC00427606) sits 4.5 miles from the center of South Salt Lake at 4,280 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 South Salt Lake, UT?

The average last frost date in South Salt Lake is March 31, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 19.

When is the first frost in South Salt Lake?

The first frost in fall usually comes around November 8. One year in ten it arrives before October 23.

How long is the growing season in South Salt Lake?

About 224 days between the average last and first frost.

When should I plant tomatoes in South Salt Lake?

Plant tomato seedlings outside from April 7 to April 21. Start seeds indoors six to eight weeks earlier.

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