Altamont, MO 64620 Frost Dates
When can you plant in Altamont, MO?
Around 04/19 is the usual last spring frost, about 234 days away. The first fall frost typically arrives around 10/21, about 184 frost-free days later.
Zone 6a (-10 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 Altamont, not a forecast for this year.
What to do before the first frost
About 8 weeks of growing season left in Altamont before the first fall frost — a cold frame or row cover can stretch harvest weeks past that date.
The actual range around Altamont's last frost
04/19 is the middle of 30 years of NOAA records, not a promise. Plant by 04/05 and you're betting against frost in roughly 9 years out of 10. 05/04 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Altamont compares
Altamont's growing season runs about 184 days, ranking 23,671 of 40,283 US ZIP codes measured here, longest to shortest. Within MO, it ranks 933 of 1,129.
Learn more
local microclimates covers what one yard in Altamont can differ from the 64620 normal. zone vs. frost date covers why Zone 6a and Altamont's frost date answer different questions.