Mifflinburg, PA 17862 Frost Dates
When can you plant in Mifflinburg, PA?
Around 04/25 is the usual last spring frost, about 240 days away. The first fall frost typically arrives around 10/19, about 175 frost-free days later.
Mifflinburg sits in USDA Zone 6b (-5 to 0°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.
What to do before the first frost
About 7 weeks of growing season left in Mifflinburg before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Mifflinburg's last frost
04/25 is the middle of 30 years of NOAA records, not a promise. Plant by 04/12 and you're betting against frost in roughly 9 years out of 10. 05/11 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mifflinburg compares
Mifflinburg's growing season runs about 175 days, ranking 26,923 of 40,283 US ZIP codes measured here, longest to shortest. Within PA, it ranks 1,152 of 2,088.
Learn more
local microclimates covers what one yard in Mifflinburg can differ from the 17862 normal. zone vs. frost date covers why Zone 6b and Mifflinburg's frost date answer different questions.