Richfield, WI 53033 Frost Dates
Frost dates for Richfield, WI, ZIP 53033
Around 04/30 is the usual last spring frost, about 245 days away. The first fall frost typically arrives around 10/16, about 167 frost-free days later.
Richfield 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 Richfield has about 7 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 04/30 isn't a guarantee
04/30 is the middle of 30 years of NOAA records, not a promise. Plant by 04/16 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 Richfield compares
Richfield's growing season runs about 167 days, ranking 29,909 of 40,283 US ZIP codes measured here, longest to shortest. Within WI, it ranks 155 of 860.
Learn more
local microclimates explains what one yard in Richfield can differ from the 53033 normal, and zone vs. frost date explains why Zone 5a and Richfield's frost date answer different questions.