Frost dates / Utah / Lehi

Frost dates in Lehi, UT

The station on this page is UTAH LAKE LEHI, UT US (USC00428973), 4.2 miles from the city point. Population in the Census 2024 estimate is 93,446.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 84043 (0.4 miles from the city point used on this page).

Median last 32°F is April 30. Median first 32°F is October 9. The 50% growing-season length is 159 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 14	Earlier date. A last 32°F on or after this day is common.
50%	April 30	Median.
10%	May 27	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 26	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 9	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%	159
90%	131

28°F threshold

	10%	50%	90%
Last, on or after	May 2	April 15	March 28
First, on or before	October 5	October 22	November 6
Season at least	211 days	187 days	163 days

36°F threshold

	10%	50%	90%
Last, on or after	June 13	May 20	April 30
First, on or before	September 16	September 28	October 13
Season at least	156 days	131 days	104 days

Station UTAH LAKE LEHI, UT US (USC00428973). Completeness flag R, 14 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 1373.1 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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Lehi, UT

Zone 7aAverage annual extreme minimum 0°F to 5°F

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

Utah. Nearest qualified station: UTAH LAKE LEHI, UT US (USC00428973), 4.2 miles. Median last 32°F April 30. Median first 32°F October 9. The 50% growing-season length is 159 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 27	April 30	April 14
First 32°F on or before	September 26	October 9	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 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.

Date checks use your device’s calendar and appear after the page loads.