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Frost dates and growing zones in Oregon

11 town pages so far. Zones from the 2023 USDA Plant Hardiness Zone Map, frost dates from NOAA 1991-2020 normals at the nearest weather station.

Towns covered so far in Oregon fall in USDA zones 6b, 8b, 9a. Median dates mean frost comes later (spring) or earlier (fall) in half of years.

Towns

Town	Zone	Median last frost	Median first frost
Portland	9a	Mar 13	Nov 19
Salem	8b	Apr 3	Nov 1
Eugene	8b	Apr 11	Oct 23
Bend	6b	Jun 6	Sep 20
Beaverton	9a	Apr 1	Nov 6
Medford	8b	Apr 8	Oct 29
Corvallis	8b	Apr 17	Oct 28
Tigard	9a	Apr 1	Nov 6
Albany	8b	Apr 17	Oct 28
Grants Pass	8b	Apr 8	Oct 28
McMinnville	8b	Apr 5	Nov 7