Gladstone, OR 97027 Frost Dates
Gladstone, OR: when does the frost end?
The last spring frost here typically falls around 03/16, about 200 days from today. Fall's first freeze usually shows up around 11/14, roughly 242 days after the last spring frost.
Zone 9a (20 to 25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Gladstone, not a forecast for this year.
Stretching the season past the first frost
With roughly 11 weeks until Gladstone's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/16 isn't a guarantee
03/16 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/07 and only about 1 year in 10 sees frost after that.
Gladstone against the rest of the dataset
Gladstone's growing season runs about 242 days, ranking 8,357 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 112 of 463.
Learn more
Before leaning on 97027's figures: zone vs. frost date explains why Zone 9a and Gladstone's frost date answer different questions, while the frost range explains how to read the range around Gladstone's dates instead of trusting one.