Morton, WA 98361 Frost Dates
When can you plant in Morton, WA?
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/08, about 162 frost-free days later.
Zone 7a (0 to 5°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 Morton, not a forecast for this year.
What to do before the first frost
About 6 weeks of growing season left in Morton before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Morton's last frost
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/17 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morton compares
About 162 days separate Morton's last and first frost, putting it 31,793 of 40,283 ZIP codes nationally. Within WA, it ranks 561 of 700.
Learn more
local microclimates covers what one yard in Morton can differ from the 98361 normal. zone vs. frost date covers why Zone 7a and Morton's frost date answer different questions.