Frost dates / Missouri / Chesterfield

Frost dates in Chesterfield, MO

The station on this page is ST CHARLES 7 SSW, MO US (USC00237398), 3.4 miles from the city point. Population in the Census 2024 estimate is 49,465.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 63017 (1.8 miles from the city point used on this page).

Median last 32°F is April 4. Median first 32°F is October 29. The 50% growing-season length is 206 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%	March 20	Earlier date. A last 32°F on or after this day is common.
50%	April 4	Median.
10%	April 21	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%	October 15	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 29	Median.
90%	November 11	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%	228
50%	206
90%	186

28°F threshold

	10%	50%	90%
Last, on or after	April 8	March 25	March 8
First, on or before	October 27	November 8	November 27
Season at least	252 days	228 days	207 days

36°F threshold

	10%	50%	90%
Last, on or after	May 1	April 16	April 3
First, on or before	October 5	October 19	October 31
Season at least	202 days	185 days	165 days

Station ST CHARLES 7 SSW, MO US (USC00237398). Completeness flag S, 28 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 137.2 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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Chesterfield, MO

Zone 7aAverage annual extreme minimum 0°F to 5°F

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

Missouri. Nearest qualified station: ST CHARLES 7 SSW, MO US (USC00237398), 3.4 miles. Median last 32°F April 4. Median first 32°F October 29. The 50% growing-season length is 206 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 21	April 4	March 20
First 32°F on or before	October 15	October 29	November 11

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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