John Day, OR 97845 Frost Dates
Frost dates for John Day, OR, ZIP 97845
Typically, the last spring freeze lands around 05/28, roughly 273 days out. The first fall frost typically arrives around 09/18, about 113 frost-free days later.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for John Day, not a forecast for this year.
What to do before the first frost
Zone 6b around John Day has about 3 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 05/28 isn't a guarantee
05/28 is the middle of 30 years of NOAA records, not a promise. Plant by 05/12 and you're betting against frost in roughly 9 years out of 10. 06/15 is the safer bet, historically only a 1-in-10 chance of frost that late.
How John Day compares
John Day's growing season runs about 113 days, ranking 39,394 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 395 of 463.
Learn more
the frost range explains how to read the range around John Day's dates instead of trusting one, and local microclimates explains what one yard in John Day can differ from the 97845 normal.