Frost dates / Utah / Logan

Frost dates in Logan, UT

The station on this page is LOGAN RADIO KVNU, UT US (USC00425182), 0.8 miles from the city point. Population in the Census 2024 estimate is 56,770.

Zone 6aUSDA average annual extreme minimum -10°F to -5°F, from ZIP 84341 (2.6 miles from the city point used on this page).

Median last 32°F is May 8. Median first 32°F is October 2. The 50% growing-season length is 145 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 25	Earlier date. A last 32°F on or after this day is common.
50%	May 8	Median.
10%	June 2	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 15	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%	164
50%	145
90%	121

28°F threshold

	10%	50%	90%
Last, on or after	May 7	April 23	April 6
First, on or before	September 29	October 14	October 26
Season at least	194 days	173 days	151 days

36°F threshold

	10%	50%	90%
Last, on or after	June 13	May 27	May 10
First, on or before	September 6	September 21	October 5
Season at least	137 days	114 days	90 days

Station LOGAN RADIO KVNU, UT US (USC00425182). 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 1364 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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Logan, UT

Zone 6aAverage annual extreme minimum -10°F to -5°F

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

Utah. Nearest qualified station: LOGAN RADIO KVNU, UT US (USC00425182), 0.8 miles. Median last 32°F May 8. Median first 32°F October 2. The 50% growing-season length is 145 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	June 2	May 8	April 25
First 32°F on or before	September 18	October 2	October 15

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 Utah 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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