Pasadena Hills, MO 63121 Frost Dates
63121, near Pasadena Hills, MO: the frost window
Typically, the last spring freeze lands around 04/02, roughly 217 days out. Fall's first freeze usually shows up around 11/04, roughly 215 days after the last spring frost.
Zone 7a (0 to 5°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 Pasadena Hills, not a forecast for this year.
Stretching the season past the first frost
Pasadena Hills's growing season runs out in roughly 10 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 Pasadena Hills's last frost
04/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/17 and only about 1 year in 10 sees frost after that.
Pasadena Hills against the rest of the dataset
About 215 days separate Pasadena Hills's last and first frost, putting it 14,143 of 40,283 ZIP codes nationally. Within MO, it ranks 121 of 1,129.
Learn more
Two guides worth reading on 63121: the frost range, on how to read the range around Pasadena Hills's dates instead of trusting one, and local microclimates, on what one yard in Pasadena Hills can differ from the 63121 normal.