Spring Green, WI 53588 Frost Dates
When can you plant in Spring Green, WI?
The last spring frost here typically falls around 04/30, about 245 days from today. The first fall frost typically arrives around 10/09, about 161 frost-free days later.
The USDA Plant Hardiness Zone Map puts Spring Green 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
About 6 weeks of growing season left in Spring Green before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
Why 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/15 and you're betting against frost in roughly 9 years out of 10. 05/14 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Spring Green compares
Spring Green's growing season runs about 161 days, ranking 32,078 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 326 of 860.
Learn more
zone vs. frost date covers why Zone 5a and Spring Green's frost date answer different questions. the frost range covers how to read the range around Spring Green's dates instead of trusting one.