Frost dates in Oregon

Across Oregon's 162 NOAA stations with a frost every year, the typical last spring frost ranges from February 25 at Portland KGW-TV (160 feet above sea level) to June 11 at Burns Municipal Airport (4,140 feet above sea level). The middle station's date is April 24.

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Last frost across Oregon

The frost-free season runs from 84 days at Enterprise 20 NNE to 280 days at Portland KGW-TV.

The station with the latest frost sits about 4,000 feet higher than the one with the earliest.

At 10 stations a freezing night doesn't come every winter, so the dates there apply only to the years that have one.

At 18 stations, all high or far north, frost is possible in every month.

These are typical dates: in half of springs the last frost comes later. Each place's page, and each ZIP code lookup, also gives the late-year date, after which only 1 spring in 10 has a frost. That's the safer date for tender plants.

Frost dates for Oregon's larger places

Typical (1-in-2) dates. Each place's page has the early and late years, a planting calendar and a printable planner. Zones are for the ZIP code nearest each place's center.

Hardiness zones in Oregon

Oregon's 473 ZIP codes in the USDA list fall in zones 5b to 9b: 5b (under 1 percent), 6a (6 percent), 6b (13 percent), 7a (8 percent), 7b (4 percent), 8a (3 percent), 8b (40 percent), 9a (24 percent) and 9b (2 percent). Compared with the 2012 map, 31 percent of them moved to a warmer half zone (9 by a full zone or more), 66 percent stayed the same and 15 moved to a colder one.

A hardiness zone is about the coldest night of winter, which decides which shrubs, trees and perennials survive. Frost dates are about spring and fall, which decide when to plant. You need both. Read more about what the zones mean and what changed in 2023.

Every NOAA station in Oregon

All 190 stations in Oregon with frost statistics in NOAA's 1991 to 2020 normals, from A to Z. Station names are usually a town, an airport, or a distance and direction from a town. Find one near you and at a similar elevation.

*Not every winter has a freeze at this station; the date is for the years that do.

Typical (1-in-2) dates at 32°F. For the early and late years, and a planting calendar built from your own dates, look up your ZIP code.