Last frost date in Logan, UT

Average last frost
May 8

The average last frost in Logan is May 8. By June 2 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 2, which leaves 145 frost-free days. An early freeze before September 18 happens one year in ten.

Safe after (10% risk)
Jun 2
Average first frost
Oct 2
Frost-free season
145 days
Hard freeze (28°F) ends
Apr 23
Next 7 nights in Logan

Frost likely Sat night, low 32°F

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

  1. ThuOct 2243°
  2. FriOct 2334°possible frost
  3. SatOct 2432°frost
  4. SunOct 2532°frost
  5. MonOct 2633°possible frost
  6. TueOct 2733°possible frost
  7. WedOct 2835°possible frost
JanFebMarAprMayJunJulAugSepOctNovDecLast frost May 8First frost Oct 2145 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND145 frost-free days
Frost risk through the year at Logan Radio Kvnu, 0.8 miles from Logan.

Planting calendar for Logan

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
TomatoesMay 15–May 29
PumpkinsMay 22–Jun 5
SunflowersMay 8–May 29
CucumbersMay 22–May 29
CornMay 15–May 29
Sweet potatoesMay 29–Jun 12
WatermelonMay 22–Jun 5
Green beansMay 15–Jun 5
ZucchiniMay 15–May 29
OkraMay 29–Jun 12
PeppersMay 22–Jun 5
BasilMay 15–May 29
Butternut squashMay 15–May 29
CantaloupeMay 22–Jun 5
EggplantMay 22–Jun 5
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 10–Apr 24
OnionsMar 27–Apr 17
CarrotsApr 17–May 22
LettuceApr 24–May 15
BroccoliApr 10–Apr 24
BeetsApr 10–May 22
PeasMar 27–Apr 10
CabbageApr 10–Apr 24
RadishesApr 3–May 15
Brussels sproutsApr 24–May 8
SpinachMar 27–Apr 17
CilantroApr 24–May 15
KaleApr 10–Apr 24
Collard greensApr 10–Apr 24
TurnipsApr 10–Apr 24
DillMay 8–May 22
CeleryMay 15–May 22
CauliflowerApr 24–May 8
LeeksApr 24–May 8
Swiss chardApr 24–May 22
ParsleyApr 24–May 15
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsSep 18–Oct 23
GarlicSep 11–Oct 16
Daffodil bulbsSep 4–Oct 16
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 10–Apr 24
AsparagusApr 10–Apr 24

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 25May 8Jun 2Sep 18Oct 2Oct 15
Hard freeze, 28°FApr 6Apr 23May 7Sep 29Oct 14Oct 26

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 Logan Radio Kvnu (USC00425182) sits 0.8 miles from the center of Logan at 4,475 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 Logan, UT?

The average last frost date in Logan is May 8, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after June 2.

When is the first frost in Logan?

The first frost in fall usually comes around October 2. One year in ten it arrives before September 18.

How long is the growing season in Logan?

About 145 days between the average last and first frost.

When should I plant tomatoes in Logan?

Plant tomato seedlings outside from May 15 to May 29. Start seeds indoors six to eight weeks earlier.

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