Frost dates / Minnesota / Blaine

Frost dates in Blaine, MN

The station on this page is ANDOVER 1N, MN US (USC00210190), 7.1 miles from the city point. Population in the Census 2024 estimate is 75,172.

Zone 5aUSDA average annual extreme minimum -20°F to -15°F, from ZIP 55449 (1.1 miles from the city point used on this page).

Median last 32°F is May 5. Median first 32°F is October 2. The 50% growing-season length is 148 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 23	Earlier date. A last 32°F on or after this day is common.
50%	May 5	Median.
10%	May 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%	September 18	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 2	Median.
90%	October 16	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%	168
50%	148
90%	128

28°F threshold

	10%	50%	90%
Last, on or after	May 9	April 25	April 11
First, on or before	September 27	October 13	October 27
Season at least	189 days	168 days	148 days

36°F threshold

	10%	50%	90%
Last, on or after	May 31	May 16	May 2
First, on or before	September 10	September 24	October 6
Season at least	149 days	129 days	109 days

Station ANDOVER 1N, MN US (USC00210190). Completeness flag R, 13 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 274 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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Blaine, 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: ANDOVER 1N, MN US (USC00210190), 7.1 miles. Median last 32°F May 5. Median first 32°F October 2. The 50% growing-season length is 148 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 21	May 5	April 23
First 32°F on or before	September 18	October 2	October 16

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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