South Bethlehem, PA 16253 Frost Dates
When can you plant in South Bethlehem, PA?
Around 05/10 is the usual last spring frost, about 255 days away. The first fall frost typically arrives around 10/12, about 155 frost-free days later.
South Bethlehem 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 6 weeks of growing season left in South Bethlehem before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around South Bethlehem's last frost
05/10 is the middle of 30 years of NOAA records, not a promise. Plant by 04/24 and you're betting against frost in roughly 9 years out of 10. 05/28 is the safer bet, historically only a 1-in-10 chance of frost that late.
How South Bethlehem compares
About 155 days separate South Bethlehem's last and first frost, putting it 34,084 of 40,283 ZIP codes nationally. Within PA, it ranks 1,814 of 2,088.
Learn more
local microclimates covers what one yard in South Bethlehem can differ from the 16253 normal. zone vs. frost date covers why Zone 6b and South Bethlehem's frost date answer different questions.