Frost dates / Missouri / St. Peters

Frost dates in St. Peters, MO

The station on this page is ST PETERS 2 SE, MO US (USC00237475), 1.4 miles from the city point. Population in the Census 2024 estimate is 61,398.

Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 63376 (1.2 miles from the city point used on this page).

Median last 32°F is April 9. Median first 32°F is October 26. The 50% growing-season length is 198 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 27	Earlier date. A last 32°F on or after this day is common.
50%	April 9	Median.
10%	April 25	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 14	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 26	Median.
90%	November 7	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%	219
50%	198
90%	178

28°F threshold

	10%	50%	90%
Last, on or after	April 14	March 31	March 12
First, on or before	October 25	November 5	November 22
Season at least	243 days	221 days	200 days

36°F threshold

	10%	50%	90%
Last, on or after	May 8	April 23	April 7
First, on or before	October 4	October 17	October 27
Season at least	193 days	174 days	156 days

Station ST PETERS 2 SE, MO US (USC00237475). Completeness flag R, 14 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 175.3 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. Peters, MO

Zone 6bAverage annual extreme minimum -5°F to 0°F

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

Missouri. Nearest qualified station: ST PETERS 2 SE, MO US (USC00237475), 1.4 miles. Median last 32°F April 9. Median first 32°F October 26. The 50% growing-season length is 198 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 25	April 9	March 27
First 32°F on or before	October 14	October 26	November 7

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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