Frost dates / Washington / Puyallup

Frost dates in Puyallup, WA

The station on this page is MCMILLIN RSVR, WA US (USC00455224), 3.4 miles from the city point. Population in the Census 2024 estimate is 42,552.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 98371 (2 miles from the city point used on this page).

Median last 32°F is April 11. Median first 32°F is October 30. The 50% growing-season length is 202 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 23	Earlier date. A last 32°F on or after this day is common.
50%	April 11	Median.
10%	April 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 13	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 30	Median.
90%	November 17	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%	226
50%	202
90%	177

28°F threshold

	10%	50%	90%
Last, on or after	April 8	March 16	February 19
First, on or before	October 28	November 14	December 8
Season at least	279 days	244 days	213 days

36°F threshold

	10%	50%	90%
Last, on or after	May 17	May 1	April 17
First, on or before	September 30	October 12	October 31
Season at least	186 days	163 days	142 days

Station MCMILLIN RSVR, WA US (USC00455224). Completeness flag R, 24 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 176.5 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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Puyallup, 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: MCMILLIN RSVR, WA US (USC00455224), 3.4 miles. Median last 32°F April 11. Median first 32°F October 30. The 50% growing-season length is 202 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 29	April 11	March 23
First 32°F on or before	October 13	October 30	November 17

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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