Ada, MN 56541 Frost Dates
Frost dates for Ada, MN, ZIP 56541
Around 05/11 is the usual last spring frost, about 256 days away. The first fall frost typically arrives around 09/27, about 137 frost-free days later.
Ada sits in USDA Zone 4a (-30 to -25°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 4a around Ada has about 4 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 05/11 isn't a guarantee
05/11 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. 05/25 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Ada compares
About 137 days separate Ada's last and first frost, putting it 37,523 of 40,283 ZIP codes nationally. Within MN, it ranks 781 of 943.
Learn more
the frost range explains how to read the range around Ada's dates instead of trusting one, and local microclimates explains what one yard in Ada can differ from the 56541 normal.