Richfield, MN 55425 Frost Dates
Frost dates for Richfield, MN, ZIP 55425
Around 04/23 is the usual last spring frost, about 238 days away. The first fall frost typically arrives around 10/18, about 176 frost-free days later.
Zone 5a (-20 to -15°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 Richfield, not a forecast for this year.
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.
The actual range around Richfield's last frost
04/23 is the middle of 30 years of NOAA records, not a promise. Plant by 04/08 and you're betting against frost in roughly 9 years out of 10. 05/07 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Richfield compares
About 176 days separate Richfield's last and first frost, putting it 26,373 of 40,283 ZIP codes nationally. Within MN, it ranks 40 of 943.
Learn more
local microclimates explains what one yard in Richfield can differ from the 55425 normal, and zone vs. frost date explains why Zone 5a and Richfield's frost date answer different questions.