Roseburg, OR 97471 Frost Dates
When can you plant in Roseburg, OR?
Around 03/23 is the usual last spring frost, about 207 days away. The first fall frost typically arrives around 11/18, about 237 frost-free days later.
The USDA Plant Hardiness Zone Map puts Roseburg in Zone 9a (20 to 25°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
About 12 weeks of growing season left in Roseburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 03/23 isn't a guarantee
03/23 is the middle of 30 years of NOAA records, not a promise. Plant by 02/25 and you're betting against frost in roughly 9 years out of 10. 04/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Roseburg compares
Roseburg's growing season runs about 237 days, ranking 9,078 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 126 of 463.
Learn more
zone vs. frost date covers why Zone 9a and Roseburg's frost date answer different questions. the frost range covers how to read the range around Roseburg's dates instead of trusting one.