Marcus, WA 99141 Frost Dates
Marcus, WA: when does the frost end?
The last spring frost here typically falls around 05/02, about 247 days from today. Fall's first freeze usually shows up around 10/02, roughly 153 days after the last spring frost.
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 Marcus, not a forecast for this year.
Stretching the season past the first frost
With roughly 5 weeks until Marcus's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Marcus's last frost
05/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/19 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/17 and only about 1 year in 10 sees frost after that.
Marcus against the rest of the dataset
Marcus's growing season runs about 153 days, ranking 34,639 of 40,283 US ZIP codes measured here, longest to shortest. Within WA, it ranks 593 of 700.
Learn more
Before leaning on 99141's figures: zone vs. frost date explains why Zone 6b and Marcus's frost date answer different questions, while the frost range explains how to read the range around Marcus's dates instead of trusting one.