Cottage Grove, OR 97451 Frost Dates
When can you plant in Cottage Grove, OR?
Around 04/16 is the usual last spring frost, about 231 days away. The first fall frost typically arrives around 10/25, about 193 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 Cottage Grove, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Cottage Grove before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Cottage Grove's last frost
04/16 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 05/08 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Cottage Grove compares
About 193 days separate Cottage Grove's last and first frost, putting it 19,771 of 40,283 ZIP codes nationally. Within OR, it ranks 261 of 463.
Learn more
local microclimates covers what one yard in Cottage Grove can differ from the 97451 normal. zone vs. frost date covers why Zone 8b and Cottage Grove's frost date answer different questions.