St. Robert, MO 65584 Frost Dates
When can you plant in St. Robert, MO?
The last spring frost here typically falls around 04/15, about 230 days from today. The first fall frost typically arrives around 10/21, about 185 frost-free days later.
Zone 6b (-5 to 0°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 St. Robert, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in St. Robert before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
How much risk comes with planting early here
04/15 is the middle of 30 years of NOAA records, not a promise. Plant by 03/29 and you're betting against frost in roughly 9 years out of 10. 05/02 is the safer bet, historically only a 1-in-10 chance of frost that late.
How St. Robert compares
St. Robert's growing season runs about 185 days, ranking 23,133 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 890 of 1,129.
Learn more
local microclimates covers what one yard in St. Robert can differ from the 65584 normal. zone vs. frost date covers why Zone 6b and St. Robert's frost date answer different questions.