Springfield, MO 65803 Frost Dates
65803, near Springfield, MO: the frost window
Typically, the last spring freeze lands around 04/04, roughly 219 days out. Fall's first freeze usually shows up around 10/27, roughly 204 days after the last spring frost.
Zone 6b (-5 to 0°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Springfield, not a forecast for this year.
Stretching the season past the first frost
Springfield's growing season runs out in roughly 9 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
04/04 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/21 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/20 and only about 1 year in 10 sees frost after that.
Springfield against the rest of the dataset
Springfield's growing season runs about 204 days, ranking 16,452 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 276 of 1,129.
Learn more
Two guides worth reading on 65803: local microclimates, on what one yard in Springfield can differ from the 65803 normal, and zone vs. frost date, on why Zone 6b and Springfield's frost date answer different questions.