Mullinville, KS 67109 Frost Dates
Frost dates for Mullinville, KS, ZIP 67109
Around 04/21 is the usual last spring frost, about 236 days away. The first fall frost typically arrives around 10/22, about 183 frost-free days later.
Mullinville sits in USDA Zone 6b (-5 to 0°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 6b around Mullinville has about 8 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 04/21 isn't a guarantee
04/21 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 05/03 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Mullinville compares
Mullinville's growing season runs about 183 days, ranking 24,028 of 40,283 US ZIP codes measured here, longest to shortest. Within KS, it ranks 462 of 745.
Learn more
zone vs. frost date explains why Zone 6b and Mullinville's frost date answer different questions, and the frost range explains how to read the range around Mullinville's dates instead of trusting one.