Weldon Spring, MO 63304 Frost Dates
63304, near Weldon Spring, MO: the frost window
Typically, the last spring freeze lands around 04/10, roughly 225 days out. Fall's first freeze usually shows up around 10/26, roughly 199 days after the last spring frost.
Weldon Spring 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
Weldon Spring'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
04/10 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/26 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 04/26 and only about 1 year in 10 sees frost after that.
Weldon Spring against the rest of the dataset
Weldon Spring's growing season runs about 199 days, ranking 18,092 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 430 of 1,129.
Learn more
Two guides worth reading on 63304: the frost range, on how to read the range around Weldon Spring's dates instead of trusting one, and local microclimates, on what one yard in Weldon Spring can differ from the 63304 normal.