Mount Rainier, MD 20064 Frost Dates
20064, near Mount Rainier, MD: the frost window
Around 03/29 is the usual last spring frost, about 213 days away. Fall's first freeze usually shows up around 11/08, roughly 224 days after the last spring frost.
Mount Rainier sits in USDA Zone 7b (5 to 10°F average annual minimum). The dates above are NOAA's 1991-2020 normal at the nearest reporting station, a 30-year average, not a forecast.
Stretching the season past the first frost
Mount Rainier's growing season runs out in roughly 10 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
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
About 224 days separate Mount Rainier's last and first frost, putting it 11,811 of 40,283 ZIP codes nationally. Within MD, it ranks 119 of 583.
Learn more
Two guides worth reading on 20064: the frost range, on how to read the range around Mount Rainier's dates instead of trusting one, and local microclimates, on what one yard in Mount Rainier can differ from the 20064 normal.