Frost dates / Utah / Herriman

Frost dates in Herriman, UT

The station on this page is DRAPER-POINT OF MTN, UT US (USC00422235), 6.4 miles from the city point. Population in the Census 2024 estimate is 62,352.

Zone 7aUSDA average annual extreme minimum 0°F to 5°F, from ZIP 84065 (4 miles from the city point used on this page).

Median last 32°F is April 18. Median first 32°F is October 22. The 50% growing-season length is 185 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 31	Earlier date. A last 32°F on or after this day is common.
50%	April 18	Median.
10%	May 6	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 7	Earlier date. A first 32°F on or before this day is uncommon.
50%	October 22	Median.
90%	November 5	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%	209
50%	185
90%	162

28°F threshold

	10%	50%	90%
Last, on or after	April 17	March 31	March 7
First, on or before	October 18	November 2	November 18
Season at least	244 days	216 days	191 days

36°F threshold

	10%	50%	90%
Last, on or after	May 22	May 2	April 17
First, on or before	September 27	October 10	October 23
Season at least	181 days	158 days	132 days

Station DRAPER-POINT OF MTN, UT US (USC00422235). Completeness flag R, 15 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 1373.4 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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Herriman, 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: DRAPER-POINT OF MTN, UT US (USC00422235), 6.4 miles. Median last 32°F April 18. Median first 32°F October 22. The 50% growing-season length is 185 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	May 6	April 18	March 31
First 32°F on or before	October 7	October 22	November 5

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.