Knob Noster, MO 65305 Frost Dates
65305, near Knob Noster, MO: the frost window
Typically, the last spring freeze lands around 04/14, roughly 229 days out. Fall's first freeze usually shows up around 10/21, roughly 189 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Knob Noster 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
Knob Noster's growing season runs out in roughly 8 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
The actual range around Knob Noster'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 05/04 and only about 1 year in 10 sees frost after that.
Knob Noster against the rest of the dataset
Knob Noster's growing season runs about 189 days, ranking 21,579 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 789 of 1,129.
Learn more
Two guides worth reading on 65305: local microclimates, on what one yard in Knob Noster can differ from the 65305 normal, and zone vs. frost date, on why Zone 6b and Knob Noster's frost date answer different questions.