New London, WI 54961 Frost Dates
Frost dates for New London, WI, ZIP 54961
Typically, the last spring freeze lands around 05/04, roughly 249 days out. The first fall frost typically arrives around 10/06, about 153 frost-free days later.
New London sits in USDA Zone 5a (-20 to -15°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
Zone 5a around New London has about 6 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.
How much risk comes with planting early here
05/04 is the middle of 30 years of NOAA records, not a promise. Plant by 04/21 and you're betting against frost in roughly 9 years out of 10. 05/19 is the safer bet, historically only a 1-in-10 chance of frost that late.
How New London compares
New London's growing season runs about 153 days, ranking 34,502 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 503 of 860.
Learn more
zone vs. frost date explains why Zone 5a and New London's frost date answer different questions, and the frost range explains how to read the range around New London's dates instead of trusting one.