Frost dates / Washington / Auburn

Frost dates in Auburn, WA

The station on this page is KENT, WA US (USC00454169), 8 miles from the city point. Population in the Census 2024 estimate is 85,513.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 98002 (0.4 miles from the city point used on this page).

Median last 32°F is March 20. Median first 32°F is November 10. The 50% growing-season length is 233 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 27	Earlier date. A last 32°F on or after this day is common.
50%	March 20	Median.
10%	April 8	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 26	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 10	Median.
90%	November 26	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%	262
50%	233
90%	207

28°F threshold

	10%	50%	90%
Last, on or after	March 16	February 25	January 19
First, on or before	November 6	November 24	December 20
Season at least	314 days	275 days	243 days

36°F threshold

	10%	50%	90%
Last, on or after	April 30	April 11	March 26
First, on or before	October 13	October 27	November 11
Season at least	217 days	197 days	175 days

Station KENT, WA US (USC00454169). Completeness flag S, 28 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 9.1 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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Auburn, 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: KENT, WA US (USC00454169), 8 miles. Median last 32°F March 20. Median first 32°F November 10. The 50% growing-season length is 233 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 8	March 20	February 27
First 32°F on or before	October 26	November 10	November 26

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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