Frost dates / Utah / Eagle Mountain

Frost dates in Eagle Mountain, UT

The station on this page is FAIRFIELD, UT US (USC00422696), 5.5 miles from the city point. Population in the Census 2024 estimate is 60,575.

Zone 6bUSDA average annual extreme minimum -5°F to 0°F, from ZIP 84005 (0.9 miles from the city point used on this page).

Median last 32°F is June 2. Median first 32°F is September 16. The 50% growing-season length is 103 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%	May 18	Earlier date. A last 32°F on or after this day is common.
50%	June 2	Median.
10%	June 24	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 1	Earlier date. A first 32°F on or before this day is uncommon.
50%	September 16	Median.
90%	September 29	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%	125
50%	103
90%	76

28°F threshold

	10%	50%	90%
Last, on or after	June 10	May 19	May 2
First, on or before	September 10	September 26	October 7
Season at least	150 days	127 days	101 days

Station FAIRFIELD, UT US (USC00422696). Completeness flag R, 22 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 1487.4 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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Eagle Mountain, UT

Zone 6bAverage annual extreme minimum -5°F to 0°F

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

Utah. Nearest qualified station: FAIRFIELD, UT US (USC00422696), 5.5 miles. Median last 32°F June 2. Median first 32°F September 16. The 50% growing-season length is 103 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	June 24	June 2	May 18
First 32°F on or before	September 1	September 16	September 29

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.