Last frost date in Kent, WA

Average last frost
March 20

The average last frost in Kent is March 20. By April 8 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about November 10, which leaves 233 frost-free days. An early freeze before October 26 happens one year in ten.

Safe after (10% risk)
Apr 8
Average first frost
Nov 10
Frost-free season
233 days
Hard freeze (28°F) ends
Feb 25
Next 6 nights in Kent

No frost in the next 6 nights

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

  1. ThuOct 2243°
  2. FriOct 2338°
  3. SatOct 2441°
  4. SunOct 2542°
  5. MonOct 2641°
  6. TueOct 2741°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Mar 20First frost Nov 10233 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND233 frost-free days
Frost risk through the year at Kent, 2.3 miles from Kent.

Planting calendar for Kent

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

Start indoorsPlant outSow outdoorsFall plantingAverage last and first frost
Warm-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
TomatoesMar 27–Apr 10
PumpkinsApr 3–Apr 17
SunflowersMar 20–Apr 10
CucumbersApr 3–Apr 10
CornMar 27–Apr 10
Sweet potatoesApr 10–Apr 24
WatermelonApr 3–Apr 17
Green beansMar 27–Apr 17
ZucchiniMar 27–Apr 10
OkraApr 10–Apr 24
PeppersApr 3–Apr 17
BasilMar 27–Apr 10
Butternut squashMar 27–Apr 10
CantaloupeApr 3–Apr 17
EggplantApr 3–Apr 17
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesFeb 20–Mar 6
OnionsFeb 6–Feb 27
CarrotsFeb 27–Apr 3
LettuceMar 6–Mar 27
BroccoliFeb 20–Mar 6
BeetsFeb 20–Apr 3
PeasFeb 6–Feb 20
CabbageFeb 20–Mar 6
RadishesFeb 13–Mar 27
Brussels sproutsMar 6–Mar 20
SpinachFeb 6–Feb 27
CilantroMar 6–Mar 27
KaleFeb 20–Mar 6
Collard greensFeb 20–Mar 6
TurnipsFeb 20–Mar 6
DillMar 20–Apr 3
CeleryMar 27–Apr 3
CauliflowerMar 6–Mar 20
LeeksMar 6–Mar 20
Swiss chardMar 6–Apr 3
ParsleyMar 6–Mar 27
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 27–Dec 1
GarlicOct 20–Nov 24
Daffodil bulbsOct 13–Nov 24
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesFeb 20–Mar 6
AsparagusFeb 20–Mar 6

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FFeb 27Mar 20Apr 8Oct 26Nov 10Nov 26
Hard freeze, 28°FJan 19Feb 25Mar 16Nov 6Nov 24Dec 20

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 Kent (USC00454169) sits 2.3 miles from the center of Kent at 30 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 Kent, WA?

The average last frost date in Kent is March 20, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 8.

When is the first frost in Kent?

The first frost in fall usually comes around November 10. One year in ten it arrives before October 26.

How long is the growing season in Kent?

About 233 days between the average last and first frost.

When should I plant tomatoes in Kent?

Plant tomato seedlings outside from March 27 to April 10. Start seeds indoors six to eight weeks earlier.

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