Frost dates / Washington / Lynnwood

Frost dates in Lynnwood, WA

The station on this page is EVERETT SNOHOMISH AP, WA US (USW00024222), 5.5 miles from the city point. Population in the Census 2024 estimate is 41,597.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 98037 (1 miles from the city point used on this page).

Median last 32°F is March 9. Median first 32°F is November 17. The 50% growing-season length is 250 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	February 15	Earlier date. A last 32°F on or after this day is common.
50%	March 9	Median.
10%	March 29	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	October 31	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 17	Median.
90%	December 7	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	285
50%	250
90%	224

28°F threshold

	10%	50%	90%
Last, on or after	March 9	February 13	January 1
First, on or before	November 15	December 6	January 8
Season at least	340 days	300 days	262 days

36°F threshold

	10%	50%	90%
Last, on or after	April 27	April 3	March 15
First, on or before	October 19	November 2	November 20
Season at least	236 days	211 days	185 days

Station EVERETT SNOHOMISH AP, WA US (USW00024222). Completeness flag R, 22 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 99.9%. Freeze dates are conditional on that threshold occurring. Elevation 184.7 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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Lynnwood, WA

Zone 9aAverage annual extreme minimum 20°F to 25°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Washington. Nearest qualified station: EVERETT SNOHOMISH AP, WA US (USW00024222), 5.5 miles. Median last 32°F March 9. Median first 32°F November 17. The 50% growing-season length is 250 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 29	March 9	February 15
First 32°F on or before	October 31	November 17	December 7

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Washington are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

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