Webster, WI 54845 Frost Dates
When can you plant in Webster, WI?
Typically, the last spring freeze lands around 05/14, roughly 259 days out. The first fall frost typically arrives around 09/28, about 135 frost-free days later.
Zone 4a (-30 to -25°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Webster, not a forecast for this year.
What to do before the first frost
About 4 weeks of growing season left in Webster before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Webster's last frost
05/14 is the middle of 30 years of NOAA records, not a promise. Plant by 04/30 and you're betting against frost in roughly 9 years out of 10. 05/29 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Webster compares
Webster's growing season runs about 135 days, ranking 37,900 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 777 of 860.
Learn more
zone vs. frost date covers why Zone 4a and Webster's frost date answer different questions. the frost range covers how to read the range around Webster's dates instead of trusting one.