Frost dates / Oregon / Tigard

Frost dates in Tigard, OR

The station on this page is BEAVERTON 2 SSW, OR US (USC00350595), 2.8 miles from the city point. Population in the Census 2024 estimate is 57,301.

Zone 9aUSDA average annual extreme minimum 20°F to 25°F, from ZIP 97223 (1.3 miles from the city point used on this page).

Median last 32°F is April 1. Median first 32°F is November 6. The 50% growing-season length is 222 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 5	Earlier date. A last 32°F on or after this day is common.
50%	April 1	Median.
10%	April 26	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 19	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 6	Median.
90%	December 1	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%	254
50%	222
90%	186

28°F threshold

	10%	50%	90%
Last, on or after	March 26	February 26	January 23
First, on or before	November 6	November 30	December 27
Season at least	317 days	275 days	239 days

36°F threshold

	10%	50%	90%
Last, on or after	May 16	April 28	April 11
First, on or before	October 4	October 21	November 7
Season at least	198 days	174 days	150 days

Station BEAVERTON 2 SSW, OR US (USC00350595). Completeness flag R, 15 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 82.3 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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Tigard, OR

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

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

Oregon. Nearest qualified station: BEAVERTON 2 SSW, OR US (USC00350595), 2.8 miles. Median last 32°F April 1. Median first 32°F November 6. The 50% growing-season length is 222 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 26	April 1	March 5
First 32°F on or before	October 19	November 6	December 1

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 Oregon 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.

Date checks use your device’s calendar and appear after the page loads.