Merrill, OR 97633 Frost Dates
When can you plant in Merrill, OR?
The last spring frost here typically falls around 06/06, about 282 days from today. The first fall frost typically arrives around 09/14, about 97 frost-free days later.
Zone 6b (-5 to 0°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 Merrill, not a forecast for this year.
What to do before the first frost
About 2 weeks of growing season left in Merrill before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 06/06 isn't a guarantee
06/06 is the middle of 30 years of NOAA records, not a promise. Plant by 05/18 and you're betting against frost in roughly 9 years out of 10. 06/23 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Merrill compares
Merrill's growing season runs about 97 days, ranking 39,779 of 40,283 US ZIP codes measured here, longest to shortest. Within OR, it ranks 427 of 463.
Learn more
local microclimates covers what one yard in Merrill can differ from the 97633 normal. zone vs. frost date covers why Zone 6b and Merrill's frost date answer different questions.