Amazonia, MO 64421 Frost Dates
Amazonia, MO: when does the frost end?
Typically, the last spring freeze lands around 04/19, roughly 234 days out. Fall's first freeze usually shows up around 10/17, roughly 180 days after the last spring frost.
Amazonia sits in USDA Zone 6a (-10 to -5°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.
Stretching the season past the first frost
With roughly 7 weeks until Amazonia's first fall frost, a row cover or cold frame is what stretches the last few weeks of harvest here.
The actual range around Amazonia's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/05 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.
Amazonia against the rest of the dataset
About 180 days separate Amazonia's last and first frost, putting it 25,060 of 40,283 ZIP codes nationally. Within MO, it ranks 1,025 of 1,129.
Learn more
Before leaning on 64421's figures: zone vs. frost date explains why Zone 6a and Amazonia's frost date answer different questions, while the frost range explains how to read the range around Amazonia's dates instead of trusting one.