Boardman, OR 97818 Frost Dates
Frost dates for Boardman, OR, ZIP 97818
The last spring frost here typically falls around 04/14, about 229 days from today. The first fall frost typically arrives around 10/21, about 188 frost-free days later.
Zone 7b (5 to 10°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 Boardman, not a forecast for this year.
What to do before the first frost
Zone 7b around Boardman has about 8 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.
The actual range around Boardman's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Plant by 03/28 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Boardman compares
Boardman's growing season runs about 188 days, ranking 22,017 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 289 of 463.
Learn more
local microclimates explains what one yard in Boardman can differ from the 97818 normal, and zone vs. frost date explains why Zone 7b and Boardman's frost date answer different questions.