Tillamook, OR 97141 Frost Dates
Tillamook, OR: when does the frost end?
Typically, the last spring freeze lands around 03/17, roughly 201 days out. Fall's first freeze usually shows up around 11/22, roughly 251 days after the last spring frost.
Tillamook 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 Tillamook's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/17 isn't a guarantee
03/17 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 02/09 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/15 and only about 1 year in 10 sees frost after that.
Tillamook against the rest of the dataset
About 251 days separate Tillamook's last and first frost, putting it 7,325 of 40,283 ZIP codes nationally. Within OR, it ranks 58 of 463.
Learn more
Before leaning on 97141's figures: the frost range explains how to read the range around Tillamook's dates instead of trusting one, while local microclimates explains what one yard in Tillamook can differ from the 97141 normal.