Mount Rainier, MD 20017 Frost Dates
Mount Rainier, MD: when does the frost end?
The last spring frost here typically falls around 03/29, about 213 days from today. Fall's first freeze usually shows up around 11/08, roughly 224 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Mount Rainier in Zone 7b (5 to 10°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 10 weeks until Mount Rainier's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
Why 03/29 isn't a guarantee
03/29 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/15 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/11 and only about 1 year in 10 sees frost after that.
Mount Rainier against the rest of the dataset
At roughly 224 frost-free days, Mount Rainier places 11,809 of 40,283 ZIP codes in this dataset. Within MD, it ranks 117 of 583.
Learn more
Before leaning on 20017's figures: the frost range explains how to read the range around Mount Rainier's dates instead of trusting one, while local microclimates explains what one yard in Mount Rainier can differ from the 20017 normal.