Arrow Rock, MO 65320 Frost Dates
65320, near Arrow Rock, MO: the frost window
Typically, the last spring freeze lands around 04/13, roughly 228 days out. Fall's first freeze usually shows up around 10/22, roughly 191 days after the last spring frost.
Arrow Rock sits in USDA Zone 6b (-5 to 0°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
Arrow Rock'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.
How much risk comes with planting early here
04/13 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/29 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/29 and only about 1 year in 10 sees frost after that.
Arrow Rock against the rest of the dataset
At roughly 191 frost-free days, Arrow Rock places 20,955 of 40,283 ZIP codes in this dataset. Within MO, it ranks 770 of 1,129.
Learn more
Two guides worth reading on 65320: the frost range, on how to read the range around Arrow Rock's dates instead of trusting one, and local microclimates, on what one yard in Arrow Rock can differ from the 65320 normal.