Rising Sun, MD 21918 Frost Dates
21918, near Rising Sun, MD: the frost window
The last spring frost here typically falls around 04/03, about 218 days from today. Fall's first freeze usually shows up around 11/06, roughly 217 days after the last spring frost.
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 Rising Sun, not a forecast for this year.
Stretching the season past the first frost
Rising Sun'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
04/03 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/22 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/18 and only about 1 year in 10 sees frost after that.
Rising Sun against the rest of the dataset
About 217 days separate Rising Sun's last and first frost, putting it 13,502 of 40,283 ZIP codes nationally. Within MD, it ranks 301 of 583.
Learn more
Two guides worth reading on 21918: zone vs. frost date, on why Zone 7a and Rising Sun's frost date answer different questions, and the frost range, on how to read the range around Rising Sun's dates instead of trusting one.