Monroe, OR 97324 Frost Dates
When can you plant in Monroe, OR?
Around 04/13 is the usual last spring frost, about 228 days away. The first fall frost typically arrives around 11/03, about 202 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
About 10 weeks of growing season left in Monroe before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/13 isn't a guarantee
04/13 is the middle of 30 years of NOAA records, not a promise. Plant by 03/17 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Monroe compares
About 202 days separate Monroe's last and first frost, putting it 17,322 of 40,283 ZIP codes nationally. Within OR, it ranks 228 of 463.
Learn more
the frost range covers how to read the range around Monroe's dates instead of trusting one. local microclimates covers what one yard in Monroe can differ from the 97324 normal.