Frost dates / Utah / St. George

Frost dates in St. George, UT

The station on this page is ST GEORGE, UT US (USC00427516), 3.3 miles from the city point. Population in the Census 2024 estimate is 106,288.

Zone 8bUSDA average annual extreme minimum 15°F to 20°F, from ZIP 84790 (2.4 miles from the city point used on this page).

Median last 32°F is March 14. Median first 32°F is November 10. The 50% growing-season length is 239 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%	February 27	Earlier date. A last 32°F on or after this day is common.
50%	March 14	Median.
10%	April 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 27	Earlier date. A first 32°F on or before this day is uncommon.
50%	November 10	Median.
90%	November 22	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%	260
50%	239
90%	212

28°F threshold

	10%	50%	90%
Last, on or after	March 17	February 27	February 7
First, on or before	November 7	November 20	December 3
Season at least	290 days	266 days	243 days

36°F threshold

	10%	50%	90%
Last, on or after	April 21	April 3	March 17
First, on or before	October 19	November 1	November 12
Season at least	229 days	208 days	186 days

Station ST GEORGE, UT US (USC00427516). Completeness flag R, 23 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 870.8 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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St. George, UT

Zone 8bAverage annual extreme minimum 15°F to 20°F

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

Utah. Nearest qualified station: ST GEORGE, UT US (USC00427516), 3.3 miles. Median last 32°F March 14. Median first 32°F November 10. The 50% growing-season length is 239 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	April 6	March 14	February 27
First 32°F on or before	October 27	November 10	November 22

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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