Hartsburg, MO 65039 Frost Dates
Hartsburg, MO: when does the frost end?
Around 04/07 is the usual last spring frost, about 222 days away. Fall's first freeze usually shows up around 10/29, roughly 205 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Hartsburg 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 9 weeks until Hartsburg's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
How much risk comes with planting early here
04/07 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/23 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/21 and only about 1 year in 10 sees frost after that.
Hartsburg against the rest of the dataset
Hartsburg's growing season runs about 205 days, ranking 16,423 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 274 of 1,129.
Learn more
Before leaning on 65039's figures: zone vs. frost date explains why Zone 6b and Hartsburg's frost date answer different questions, while the frost range explains how to read the range around Hartsburg's dates instead of trusting one.