Missouri frost dates

Across Missouri, the average last spring frost is around April 15 and the average first fall frost around October 18 — roughly 186 frost-free days. USDA zones 5b, 6a, 6b, 7a.

Risk you accept	Last spring frost by	First fall frost by
Cautious (~10%)	April 29	October 4
Average (~50%)	April 15	October 18
Gambler (~90%)	April 1	November 1

→ Turn these into sowing dates with the Missouri planting calendar, or look up an exact ZIP code.

Statewide average from NOAA/NCEI freeze normals. Cautious/gambler dates are about two weeks either side of the average.