Monument, OR 97864 Frost Dates
Frost dates for Monument, OR, ZIP 97864
Around 05/09 is the usual last spring frost, about 254 days away. The first fall frost typically arrives around 09/27, about 139 frost-free days later.
The USDA Plant Hardiness Zone Map puts Monument in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Monument has about 4 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 Monument's last frost
05/09 is the middle of 30 years of NOAA records, not a promise. Plant by 04/25 and you're betting against frost in roughly 9 years out of 10. 05/26 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Monument compares
At roughly 139 frost-free days, Monument places 37,298 of 40,283 ZIP codes in this dataset. Within OR, it ranks 379 of 463.
Learn more
zone vs. frost date explains why Zone 7a and Monument's frost date answer different questions, and the frost range explains how to read the range around Monument's dates instead of trusting one.