Last frost date in Clearfield, UT

Average last frost
April 29

In Clearfield, the last spring frost comes around April 29 in an average year. Wait until May 25 if you want 90% odds of no more frost. The first fall frost usually arrives about October 20, which leaves 172 frost-free days. An early freeze before October 1 happens one year in ten.

Safe after (10% risk)
May 25
Average first frost
Oct 20
Frost-free season
172 days
Hard freeze (28°F) ends
Apr 13
Next 7 nights in Clearfield

No frost in the next 7 nights

Later than usual: the average first frost here is October 20.

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

  1. ThuOct 2249°
  2. FriOct 2342°
  3. SatOct 2441°
  4. SunOct 2541°
  5. MonOct 2641°
  6. TueOct 2741°
  7. WedOct 2843°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Apr 29First frost Oct 20172 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND172 frost-free days
Frost risk through the year at Weber Basin Pump Plt 3, 5.6 miles from Clearfield.

Planting calendar for Clearfield

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 6–May 20
PumpkinsMay 13–May 27
SunflowersApr 29–May 20
CucumbersMay 13–May 20
CornMay 6–May 20
Sweet potatoesMay 20–Jun 3
WatermelonMay 13–May 27
Green beansMay 6–May 27
ZucchiniMay 6–May 20
OkraMay 20–Jun 3
PeppersMay 13–May 27
BasilMay 6–May 20
Butternut squashMay 6–May 20
CantaloupeMay 13–May 27
EggplantMay 13–May 27
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesApr 1–Apr 15
OnionsMar 18–Apr 8
CarrotsApr 8–May 13
LettuceApr 15–May 6
BroccoliApr 1–Apr 15
BeetsApr 1–May 13
PeasMar 18–Apr 1
CabbageApr 1–Apr 15
RadishesMar 25–May 6
Brussels sproutsApr 15–Apr 29
SpinachMar 18–Apr 8
CilantroApr 15–May 6
KaleApr 1–Apr 15
Collard greensApr 1–Apr 15
TurnipsApr 1–Apr 15
DillApr 29–May 13
CeleryMay 6–May 13
CauliflowerApr 15–Apr 29
LeeksApr 15–Apr 29
Swiss chardApr 15–May 13
ParsleyApr 15–May 6
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 6–Nov 10
GarlicSep 29–Nov 3
Daffodil bulbsSep 22–Nov 3
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesApr 1–Apr 15
AsparagusApr 1–Apr 15

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FApr 6Apr 29May 25Oct 1Oct 20Nov 5
Hard freeze, 28°FMar 16Apr 13May 5Oct 18Nov 2Nov 15

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 Weber Basin Pump Plt 3 (USC00429346) sits 5.6 miles from the center of Clearfield at 4,900 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 Clearfield, UT?

The average last frost date in Clearfield is April 29, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 25.

When is the first frost in Clearfield?

The first frost in fall usually comes around October 20. One year in ten it arrives before October 1.

How long is the growing season in Clearfield?

About 172 days between the average last and first frost.

When should I plant tomatoes in Clearfield?

Plant tomato seedlings outside from May 6 to May 20. Start seeds indoors six to eight weeks earlier.

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