Westfield, IA 51062 Frost Dates
51062, near Westfield, IA: the frost window
Around 05/01 is the usual last spring frost, about 246 days away. Fall's first freeze usually shows up around 10/04, roughly 155 days after the last spring frost.
Zone 5a (-20 to -15°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 Westfield, not a forecast for this year.
Stretching the season past the first frost
Westfield's growing season runs out in roughly 5 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
05/01 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 04/17 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 05/14 and only about 1 year in 10 sees frost after that.
Westfield against the rest of the dataset
At roughly 155 frost-free days, Westfield places 34,178 of 40,283 ZIP codes in this dataset. Within IA, it ranks 888 of 1,042.
Learn more
Two guides worth reading on 51062: local microclimates, on what one yard in Westfield can differ from the 51062 normal, and zone vs. frost date, on why Zone 5a and Westfield's frost date answer different questions.