Frost dates / Washington / Lake Stevens

Frost dates in Lake Stevens, WA

The station on this page is EVERETT, WA US (USC00452675), 4.9 miles from the city point. Population in the Census 2024 estimate is 41,350.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 98258 (2.2 miles from the city point used on this page).

Median last 32°F is March 24. Median first 32°F is November 2. The 50% growing-season length is 223 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%	March 4	Earlier date. A last 32°F on or after this day is common.
50%	March 24	Median.
10%	April 11	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 16	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 2	Median.
90%	November 23	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%	249
50%	223
90%	197

28°F threshold

	10%	50%	90%
Last, on or after	March 20	March 1	January 31
First, on or before	October 29	November 21	December 14
Season at least	303 days	265 days	234 days

36°F threshold

	10%	50%	90%
Last, on or after	May 8	April 20	March 31
First, on or before	October 1	October 18	November 4
Season at least	209 days	183 days	154 days

Station EVERETT, WA US (USC00452675). Completeness flag S, 27 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 18.3 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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Lake Stevens, WA

Zone 8bAverage annual extreme minimum 15°F to 20°F

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

Washington. Nearest qualified station: EVERETT, WA US (USC00452675), 4.9 miles. Median last 32°F March 24. Median first 32°F November 2. The 50% growing-season length is 223 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 11	March 24	March 4
First 32°F on or before	October 16	November 2	November 23

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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