Last frost date in Silver Firs, WA

Average last frost

March 9

In Silver Firs, the last spring frost comes around March 9 in an average year. Wait until March 29 if you want 90% odds of no more frost. The first fall frost usually arrives about November 17, which leaves 250 frost-free days. An early freeze before October 31 happens one year in ten.

Safe after (10% risk): Mar 29
Average first frost: Nov 17
Frost-free season: 250 days
Hard freeze (28°F) ends: Feb 13

Next 6 nights in Silver Firs

Frost possible in low spots Fri night, low 36°F

Earlier than usual: the average first frost here is November 17.

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

ThuOct 2240°
FriOct 2336°possible frost
SatOct 2439°
SunOct 2540°
MonOct 2640°
TueOct 2739°

Frost risk through the year at Everett Snohomish Airport, 6.8 miles from Silver Firs.

Planting calendar for Silver Firs

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 16–Mar 30

PumpkinsMar 23–Apr 6

SunflowersMar 9–Mar 30

CucumbersMar 23–Mar 30

CornMar 16–Mar 30

Sweet potatoesMar 30–Apr 13

WatermelonMar 23–Apr 6

Green beansMar 16–Apr 6

ZucchiniMar 16–Mar 30

OkraMar 30–Apr 13

PeppersMar 23–Apr 6

BasilMar 16–Mar 30

Butternut squashMar 16–Mar 30

CantaloupeMar 23–Apr 6

EggplantMar 23–Apr 6

Cool-season crops

JanFebMarAprMayJunJulAugSepOctNovDec

PotatoesFeb 9–Feb 23

OnionsJan 26–Feb 16

CarrotsFeb 16–Mar 23

LettuceFeb 23–Mar 16

BroccoliFeb 9–Feb 23

BeetsFeb 9–Mar 23

PeasJan 26–Feb 9

CabbageFeb 9–Feb 23

RadishesFeb 2–Mar 16

Brussels sproutsFeb 23–Mar 9

SpinachJan 26–Feb 16

CilantroFeb 23–Mar 16

KaleFeb 9–Feb 23

Collard greensFeb 9–Feb 23

TurnipsFeb 9–Feb 23

DillMar 9–Mar 23

CeleryMar 16–Mar 23

CauliflowerFeb 23–Mar 9

LeeksFeb 23–Mar 9

Swiss chardFeb 23–Mar 23

ParsleyFeb 23–Mar 16

Fall bulbs and garlic

JanFebMarAprMayJunJulAugSepOctNovDec

Tulip bulbsNov 3–Dec 8

GarlicOct 15–Nov 30

Daffodil bulbsOct 15–Nov 30

Perennials

JanFebMarAprMayJunJulAugSepOctNovDec

StrawberriesFeb 9–Feb 23

AsparagusFeb 9–Feb 23

Frost probabilities

Threshold	Spring, 90% chance later	Spring, 50%	Spring, 10%	Fall, 10% chance earlier	Fall, 50%	Fall, 90%
Light frost, 32°F	Feb 15	Mar 9	Mar 29	Oct 31	Nov 17	Dec 7
Hard freeze, 28°F	Jan 1	Feb 13	Mar 9	Nov 15	Dec 6	Jan 8

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 Everett Snohomish Airport (USW00024222) sits 6.8 miles from the center of Silver Firs at 606 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 Silver Firs, WA?

The average last frost date in Silver Firs is March 9, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after March 29.

When is the first frost in Silver Firs?

The first frost in fall usually comes around November 17. One year in ten it arrives before October 31.

How long is the growing season in Silver Firs?

About 250 days between the average last and first frost.

When should I plant tomatoes in Silver Firs?

Plant tomato seedlings outside from March 16 to March 30. Start seeds indoors six to eight weeks earlier.

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