Williamsport, MD 21795 Frost Dates
When can you plant in Williamsport, MD?
The last spring frost here typically falls around 04/11, about 226 days from today. The first fall frost typically arrives around 10/28, about 199 frost-free days later.
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 Williamsport, not a forecast for this year.
What to do before the first frost
About 9 weeks of growing season left in Williamsport before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/11 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 04/27 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Williamsport compares
At roughly 199 frost-free days, Williamsport places 18,137 of 40,283 ZIP codes in this dataset. Within MD, it ranks 474 of 583.
Learn more
zone vs. frost date covers why Zone 7a and Williamsport's frost date answer different questions. the frost range covers how to read the range around Williamsport's dates instead of trusting one.