Monroe, WA 98272 Frost Dates
Frost dates for Monroe, WA, ZIP 98272
The last spring frost here typically falls around 04/17, about 232 days from today. The first fall frost typically arrives around 10/23, about 188 frost-free days later.
Zone 8b (15 to 20°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 Monroe, not a forecast for this year.
What to do before the first frost
Zone 8b around Monroe 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 Monroe's last frost
04/17 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Monroe compares
Monroe's growing season runs about 188 days, ranking 21,874 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 406 of 700.
Learn more
local microclimates explains what one yard in Monroe can differ from the 98272 normal, and zone vs. frost date explains why Zone 8b and Monroe's frost date answer different questions.