Philomath, OR 97326 Frost Dates
When can you plant in Philomath, OR?
The last spring frost here typically falls around 05/15, about 260 days from today. The first fall frost typically arrives around 10/08, about 145 frost-free days later.
Philomath sits in USDA Zone 8b (15 to 20°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.
What to do before the first frost
About 6 weeks of growing season left in Philomath before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Philomath's last frost
05/15 is the middle of 30 years of NOAA records, not a promise. Plant by 04/28 and you're betting against frost in roughly 9 years out of 10. 06/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Philomath compares
About 145 days separate Philomath's last and first frost, putting it 36,183 of 40,283 ZIP codes nationally. Within OR, it ranks 361 of 463.
Learn more
local microclimates covers what one yard in Philomath can differ from the 97326 normal. zone vs. frost date covers why Zone 8b and Philomath's frost date answer different questions.