Rising Sun, MD 21911 Frost Dates
Frost dates for Rising Sun, MD, ZIP 21911
The last spring frost here typically falls around 04/03, about 218 days from today. The first fall frost typically arrives around 11/06, about 217 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rising Sun in Zone 7a (0 to 5°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 7a around Rising Sun has about 10 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
The actual range around Rising Sun's last frost
04/03 is the middle of 30 years of NOAA records, not a promise. Plant by 03/22 and you're betting against frost in roughly 9 years out of 10. 04/18 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rising Sun compares
Rising Sun's growing season runs about 217 days, ranking 13,500 of 40,283 US ZIP codes measured here, longest to shortest. Within MD, it ranks 299 of 583.
Learn more
local microclimates explains what one yard in Rising Sun can differ from the 21911 normal, and zone vs. frost date explains why Zone 7a and Rising Sun's frost date answer different questions.