Frost dates / Minnesota / Minnetonka

Frost dates in Minnetonka, MN

The station on this page is NEW HOPE, MN US (USC00215838), 6.6 miles from the city point. Population in the Census 2024 estimate is 52,651.

Zone 5aUSDA average annual extreme minimum -20°F to -15°F, from ZIP 55345 (1.8 miles from the city point used on this page).

Median last 32°F is April 29. Median first 32°F is October 12. The 50% growing-season length is 163 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 15	Earlier date. A last 32°F on or after this day is common.
50%	April 29	Median.
10%	May 12	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 29	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 12	Median.
90%	October 25	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%	182
50%	163
90%	144

28°F threshold

	10%	50%	90%
Last, on or after	May 1	April 19	April 5
First, on or before	October 8	October 22	November 4
Season at least	205 days	185 days	166 days

36°F threshold

	10%	50%	90%
Last, on or after	May 23	May 8	April 26
First, on or before	September 19	October 1	October 14
Season at least	163 days	145 days	126 days

Station NEW HOPE, MN US (USC00215838). Completeness flag S, 27 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 277.4 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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Minnetonka, 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: NEW HOPE, MN US (USC00215838), 6.6 miles. Median last 32°F April 29. Median first 32°F October 12. The 50% growing-season length is 163 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 12	April 29	April 15
First 32°F on or before	September 29	October 12	October 25

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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