Moro, OR 97039 Frost Dates
Frost dates for Moro, OR, ZIP 97039
Typically, the last spring freeze lands around 05/12, roughly 257 days out. The first fall frost typically arrives around 10/04, about 143 frost-free days later.
Moro sits in USDA Zone 7a (0 to 5°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
Zone 7a around Moro has about 5 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/12 isn't a guarantee
05/12 is the middle of 30 years of NOAA records, not a promise. Plant by 04/27 and you're betting against frost in roughly 9 years out of 10. 05/31 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Moro compares
Moro's growing season runs about 143 days, ranking 36,613 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 370 of 463.
Learn more
the frost range explains how to read the range around Moro's dates instead of trusting one, and local microclimates explains what one yard in Moro can differ from the 97039 normal.