Last frost date in Oak Harbor, WA

Average last frost
March 13

In Oak Harbor, the last spring frost comes around March 13 in an average year. Wait until April 1 if you want 90% odds of no more frost. The first fall frost usually arrives about November 14, which leaves 244 frost-free days. An early freeze before October 26 happens one year in ten.

Safe after (10% risk)
Apr 1
Average first frost
Nov 14
Frost-free season
244 days
Hard freeze (28°F) ends
Feb 18
Next 6 nights in Oak Harbor

No frost in the next 6 nights

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

  1. ThuOct 2243°
  2. FriOct 2340°
  3. SatOct 2441°
  4. SunOct 2542°
  5. MonOct 2641°
  6. TueOct 2741°
JanFebMarAprMayJunJulAugSepOctNovDecLast frost Mar 13First frost Nov 14244 frost-free daysBlue: chance of 32°F frost. Green: average frost-free season.JFMAMJJASOND244 frost-free days
Frost risk through the year at Whidbey Island Nas, 4.3 miles from Oak Harbor.

Planting calendar for Oak Harbor

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 20–Apr 3
PumpkinsMar 27–Apr 10
SunflowersMar 13–Apr 3
CucumbersMar 27–Apr 3
CornMar 20–Apr 3
Sweet potatoesApr 3–Apr 17
WatermelonMar 27–Apr 10
Green beansMar 20–Apr 10
ZucchiniMar 20–Apr 3
OkraApr 3–Apr 17
PeppersMar 27–Apr 10
BasilMar 20–Apr 3
Butternut squashMar 20–Apr 3
CantaloupeMar 27–Apr 10
EggplantMar 27–Apr 10
Cool-season crops
JanFebMarAprMayJunJulAugSepOctNovDec
PotatoesFeb 13–Feb 27
OnionsJan 30–Feb 20
CarrotsFeb 20–Mar 27
LettuceFeb 27–Mar 20
BroccoliFeb 13–Feb 27
BeetsFeb 13–Mar 27
PeasJan 30–Feb 13
CabbageFeb 13–Feb 27
RadishesFeb 6–Mar 20
Brussels sproutsFeb 27–Mar 13
SpinachJan 30–Feb 20
CilantroFeb 27–Mar 20
KaleFeb 13–Feb 27
Collard greensFeb 13–Feb 27
TurnipsFeb 13–Feb 27
DillMar 13–Mar 27
CeleryMar 20–Mar 27
CauliflowerFeb 27–Mar 13
LeeksFeb 27–Mar 13
Swiss chardFeb 27–Mar 27
ParsleyFeb 27–Mar 20
Fall bulbs and garlic
JanFebMarAprMayJunJulAugSepOctNovDec
Tulip bulbsOct 31–Dec 5
GarlicOct 24–Nov 28
Daffodil bulbsOct 17–Nov 28
Perennials
JanFebMarAprMayJunJulAugSepOctNovDec
StrawberriesFeb 13–Feb 27
AsparagusFeb 13–Feb 27

Frost probabilities

ThresholdSpring, 90% chance laterSpring, 50%Spring, 10%Fall, 10% chance earlierFall, 50%Fall, 90%
Light frost, 32°FFeb 20Mar 13Apr 1Oct 26Nov 14Dec 5
Hard freeze, 28°FJan 5Feb 18Mar 12Nov 9Dec 1Jan 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 Whidbey Island Nas (USW00024255) sits 4.3 miles from the center of Oak Harbor at 47 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 Oak Harbor, WA?

The average last frost date in Oak Harbor is March 13, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after April 1.

When is the first frost in Oak Harbor?

The first frost in fall usually comes around November 14. One year in ten it arrives before October 26.

How long is the growing season in Oak Harbor?

About 244 days between the average last and first frost.

When should I plant tomatoes in Oak Harbor?

Plant tomato seedlings outside from March 20 to April 3. Start seeds indoors six to eight weeks earlier.

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