Rockville, MO 64780 Frost Dates
Frost dates for Rockville, MO, ZIP 64780
Typically, the last spring freeze lands around 04/07, roughly 222 days out. The first fall frost typically arrives around 10/29, about 202 frost-free days later.
The USDA Plant Hardiness Zone Map puts Rockville in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
What to do before the first frost
Zone 6b around Rockville has about 9 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 Rockville's last frost
04/07 is the middle of 30 years of NOAA records, not a promise. Plant by 03/23 and you're betting against frost in roughly 9 years out of 10. 04/24 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Rockville compares
About 202 days separate Rockville's last and first frost, putting it 17,380 of 40,283 ZIP codes nationally. Within MO, it ranks 354 of 1,129.
Learn more
zone vs. frost date explains why Zone 6b and Rockville's frost date answer different questions, and the frost range explains how to read the range around Rockville's dates instead of trusting one.