Frost dates / Minnesota / St. Paul

Frost dates in St. Paul, MN

The station on this page is ST PAUL DOWNTOWN AP, MN US (USW00014927), 2.6 miles from the city point. Population in the Census 2024 estimate is 307,465.

Zone 5aUSDA average annual extreme minimum -20°F to -15°F, from ZIP 55101 (0.8 miles from the city point used on this page).

Median last 32°F is April 24. Median first 32°F is October 16. The 50% growing-season length is 174 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 9	Earlier date. A last 32°F on or after this day is common.
50%	April 24	Median.
10%	May 10	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 2	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 16	Median.
90%	October 29	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%	193
50%	174
90%	154

28°F threshold

	10%	50%	90%
Last, on or after	April 28	April 13	April 1
First, on or before	October 11	October 27	November 8
Season at least	213 days	194 days	174 days

36°F threshold

	10%	50%	90%
Last, on or after	May 18	May 4	April 20
First, on or before	September 23	October 5	October 19
Season at least	172 days	153 days	134 days

Station ST PAUL DOWNTOWN AP, MN US (USW00014927). Completeness flag R, 22 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 213.4 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. Paul, MN

Zone 5aAverage annual extreme minimum -20°F to -15°F

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

Minnesota. Nearest qualified station: ST PAUL DOWNTOWN AP, MN US (USW00014927), 2.6 miles. Median last 32°F April 24. Median first 32°F October 16. The 50% growing-season length is 174 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 10	April 24	April 9
First 32°F on or before	October 2	October 16	October 29

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 Minnesota 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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