Frost dates / Minnesota / Apple Valley

Frost dates in Apple Valley, MN

The station on this page is ROSEMOUNT RSCH & OUTREACH CTR, MN US (USC00217107), 5.4 miles from the city point. Population in the Census 2024 estimate is 55,272.

Zone 5aUSDA average annual extreme minimum -20°F to -15°F, from ZIP 55124 (0 miles from the city point used on this page).

Median last 32°F is May 2. Median first 32°F is October 5. The 50% growing-season length is 155 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 19	Earlier date. A last 32°F on or after this day is common.
50%	May 2	Median.
10%	May 16	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 22	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 5	Median.
90%	October 19	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%	173
50%	155
90%	136

28°F threshold

	10%	50%	90%
Last, on or after	May 7	April 22	April 8
First, on or before	October 2	October 17	October 31
Season at least	196 days	175 days	156 days

36°F threshold

	10%	50%	90%
Last, on or after	May 26	May 12	April 29
First, on or before	September 16	September 28	October 10
Season at least	155 days	138 days	120 days

Station ROSEMOUNT RSCH & OUTREACH CTR, MN US (USC00217107). Completeness flag S, 29 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 288 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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Apple Valley, 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: ROSEMOUNT RSCH & OUTREACH CTR, MN US (USC00217107), 5.4 miles. Median last 32°F May 2. Median first 32°F October 5. The 50% growing-season length is 155 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 16	May 2	April 19
First 32°F on or before	September 22	October 5	October 19

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.

A wall calendar surrounded by vegetables, herbs, seed packets, and watering cans.

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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