Gresham, OR 97080 Frost Dates
When can you plant in Gresham, OR?
Typically, the last spring freeze lands around 03/16, roughly 200 days out. The first fall frost typically arrives around 11/20, about 250 frost-free days later.
Gresham 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 12 weeks of growing season left in Gresham before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/16 isn't a guarantee
03/16 is the middle of 30 years of NOAA records, not a promise. Plant by 02/18 and you're betting against frost in roughly 9 years out of 10. 04/12 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Gresham compares
Gresham's growing season runs about 250 days, ranking 7,418 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 64 of 463.
Learn more
local microclimates covers what one yard in Gresham can differ from the 97080 normal. zone vs. frost date covers why Zone 8b and Gresham's frost date answer different questions.