Frost dates / Missouri / St. Joseph

Frost dates in St. Joseph, MO

The station on this page is ST JOSEPH ROSECRANS AP, MO US (USW00013993), 5.5 miles from the city point. Population in the Census 2024 estimate is 71,098.

Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 64501 (1.3 miles from the city point used on this page).

Median last 32°F is April 19. Median first 32°F is October 17. The 50% growing-season length is 180 days. The green band runs from the median last frost to the median first frost. Thin ticks mark the 10%, 50%, and 90% dates.

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Last 32°F in spring

NCEI’s probability is the chance the last spring minimum of 32°F or lower occurs on or after the date.

Probability	Date	How to read it
90%	April 5	Earlier date. A last 32°F on or after this day is common.
50%	April 19	Median.
10%	May 3	Later date. A last 32°F on or after this day is uncommon.

First 32°F in fall

NCEI’s probability is the chance the first autumn minimum of 32°F or lower occurs on or before the date.

Probability	Date	How to read it
10%	September 30	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 17	Median.
90%	October 30	Later date. A first 32°F on or before this day is common.

32°F growing-season length

Days between the last spring 32°F and the first autumn 32°F. The figure is a length the season meets or exceeds at that probability, from NCEI, not a subtraction done on this site.

Probability the season is at least this long	Days
10%	201
50%	180
90%	159

28°F threshold

	10%	50%	90%
Last, on or after	April 24	April 9	March 25
First, on or before	October 13	October 26	November 8
Season at least	221 days	200 days	180 days

36°F threshold

	10%	50%	90%
Last, on or after	May 9	April 29	April 15
First, on or before	September 21	October 5	October 20
Season at least	179 days	160 days	139 days

Station ST JOSEPH ROSECRANS AP, MO US (USW00013993). Completeness flag R, 24 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 100%. Freeze dates are conditional on that threshold occurring. Elevation 249.3 m. The same probability language applies to the 28°F and 36°F rows when those dates passed the same quality checks.

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St. Joseph, MO

Zone 6aAverage annual extreme minimum -10°F to -5°F

Outside the median season Growing seasonTicks: 10%, 50%, and 90%

Missouri. Nearest qualified station: ST JOSEPH ROSECRANS AP, MO US (USW00013993), 5.5 miles. Median last 32°F April 19. Median first 32°F October 17. The 50% growing-season length is 180 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 3	April 19	April 5
First 32°F on or before	September 30	October 17	October 30

Column order matches the NCEI file: for the last freeze, 10% is the later date and 90% is the earlier date. How to read the probabilities.

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Planting calendar

Frost dates for Missouri are above. Planting windows appear for states with a cited extension guide. The fall and seed tools use the numbers you enter and the station dates.

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