Warrenton, MO 63378 Frost Dates
Warrenton, MO: when does the frost end?
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/23, roughly 191 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Warrenton in Zone 6b (-5 to 0°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
With roughly 8 weeks until Warrenton's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Warrenton's last frost
04/14 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/31 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/03 and only about 1 year in 10 sees frost after that.
Warrenton against the rest of the dataset
Warrenton's growing season runs about 191 days, ranking 20,738 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 716 of 1,129.
Learn more
Before leaning on 63378's figures: zone vs. frost date explains why Zone 6b and Warrenton's frost date answer different questions, while the frost range explains how to read the range around Warrenton's dates instead of trusting one.