Milwaukie, OR 97222 Frost Dates
97222, near Milwaukie, OR: the frost window
The last spring frost here typically falls around 03/13, about 197 days from today. Fall's first freeze usually shows up around 11/19, roughly 247 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Milwaukie in Zone 9a (20 to 25°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Milwaukie's growing season runs out in roughly 12 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
03/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/01 and only about 1 year in 10 sees frost after that.
Milwaukie against the rest of the dataset
About 247 days separate Milwaukie's last and first frost, putting it 7,802 of 40,283 ZIP codes nationally. Within OR, it ranks 95 of 463.
Learn more
Two guides worth reading on 97222: local microclimates, on what one yard in Milwaukie can differ from the 97222 normal, and zone vs. frost date, on why Zone 9a and Milwaukie's frost date answer different questions.