Frost dates / Utah / West Valley City

Frost dates in West Valley City, UT

The station on this page is SALT LAKE CITY INTL AP, UT US (USW00024127), 6.6 miles from the city point. Population in the Census 2024 estimate is 138,144.

Zone 7bUSDA average annual extreme minimum 5°F to 10°F, from ZIP 84120 (0.8 miles from the city point used on this page).

Median last 32°F is April 8. Median first 32°F is October 31. The 50% growing-season length is 204 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%	March 17	Earlier date. A last 32°F on or after this day is common.
50%	April 8	Median.
10%	April 30	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 17	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 31	Median.
90%	November 13	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%	229
50%	204
90%	177

28°F threshold

	10%	50%	90%
Last, on or after	April 8	March 15	February 27
First, on or before	October 27	November 10	November 24
Season at least	261 days	237 days	210 days

36°F threshold

	10%	50%	90%
Last, on or after	May 14	April 27	April 8
First, on or before	October 7	October 19	November 2
Season at least	196 days	174 days	152 days

Station SALT LAKE CITY INTL AP, UT US (USW00024127). 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 1287.8 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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West Valley City, UT

Zone 7bAverage annual extreme minimum 5°F to 10°F

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

Utah. Nearest qualified station: SALT LAKE CITY INTL AP, UT US (USW00024127), 6.6 miles. Median last 32°F April 8. Median first 32°F October 31. The 50% growing-season length is 204 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 30	April 8	March 17
First 32°F on or before	October 17	October 31	November 13

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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