Tualatin, OR 97062 Frost Dates
Tualatin, OR: when does the frost end?
The last spring frost here typically falls around 03/21, about 205 days from today. Fall's first freeze usually shows up around 11/22, roughly 241 days after the last spring frost.
Tualatin sits in USDA Zone 9a (20 to 25°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
With roughly 12 weeks until Tualatin's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Tualatin's last frost
03/21 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/19 and only about 1 year in 10 sees frost after that.
Tualatin against the rest of the dataset
Tualatin's growing season runs about 241 days, ranking 8,520 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 119 of 463.
Learn more
Before leaning on 97062's figures: zone vs. frost date explains why Zone 9a and Tualatin's frost date answer different questions, while the frost range explains how to read the range around Tualatin's dates instead of trusting one.