Frost dates in Washington County, Oregon

Deep blue Crater Lake ringed by snowy cliffs in winter, Oregon — Photo: WolfmanSF, CC BY-SA 3.0, via Wikimedia Commons

The average last spring frost in Washington County falls Feb 11 to May 8 and the average first fall frost Oct 1 to Dec 5, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 8b to 9a. Places: Aloha, Banks, Beaverton, Bethany, Cherry Grove, Cornelius. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.

ZIP	Place	Last spring frost	First fall frost	Zone
97003	Aloha	Feb 11	Dec 5	9a
97005	Beaverton	Feb 11	Dec 5	9a
97006	Beaverton	Feb 11	Dec 5	8b
97007	Beaverton	Apr 1	Nov 6	8b
97008	Beaverton	Apr 1	Nov 6	9a
97062	Tualatin	Mar 18	Nov 13	9a
97078	Aloha	Feb 11	Dec 5	8b
97106	Banks	Apr 16	Oct 26	8b
97109		May 8	Oct 1	8b
97113	Cornelius	Apr 16	Oct 26	8b
97116	Forest Grove	Apr 16	Oct 26	8b
97117		Apr 16	Oct 26	8b
97119	Cherry Grove	Apr 16	Oct 26	8b
97123	Hillsboro	Apr 16	Oct 23	8b
97124	Hillsboro	Apr 16	Oct 23	8b
97125		Apr 16	Oct 26	8b
97133	North Plains	Apr 10	Nov 2	8b
97140	Sherwood	Mar 21	Nov 22	8b
97144		May 8	Oct 1	8b
97223	Tigard	Apr 1	Nov 6	9a
97224	Tigard	Apr 1	Nov 6	9a
97225	Beaverton	Feb 11	Dec 5	8b
97229	Bethany	Feb 11	Dec 5	8b

Nearby counties

Multnomah County Yamhill County Columbia County Clackamas County Marion County Tillamook County

All Oregon counties · Download Oregon frost dates (CSV)

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