Rock Springs, WI 53961 Frost Dates
Frost dates for Rock Springs, WI, ZIP 53961
Typically, the last spring freeze lands around 05/02, roughly 247 days out. The first fall frost typically arrives around 10/07, about 156 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rock Springs in Zone 5a (-20 to -15°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 5a around Rock Springs 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.
Why 05/02 isn't a guarantee
05/02 is the middle of 30 years of NOAA records, not a promise. Plant by 04/18 and you're betting against frost in roughly 9 years out of 10. 05/16 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rock Springs compares
Rock Springs's growing season runs about 156 days, ranking 33,804 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 425 of 860.
Learn more
the frost range explains how to read the range around Rock Springs's dates instead of trusting one, and local microclimates explains what one yard in Rock Springs can differ from the 53961 normal.