Frost dates / Arizona / Mesa

Frost dates in Mesa, AZ

The station on this page is E MESA, AZ US (USC00022782), 4.4 miles from the city point. Population in the Census 2024 estimate is 517,151.

Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 85206 (0.2 miles from the city point used on this page).

Median last 32°F is February 1. Median first 32°F is December 10. The 50% growing-season length is 312 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%	January 1	Earlier date. A last 32°F on or after this day is common.
50%	February 1	Median.
10%	February 28	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%	November 22	Earlier date. A first 32°F on or before this day is uncommon.
50%	December 10	Median.
90%	January 1	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%	348
50%	312
90%	280

28°F threshold

	10%	50%	90%
Last, on or after	February 11	January 11	December 13
First, on or before	December 1	December 26	January 28
Season at least	365 days	352 days	317 days

36°F threshold

	10%	50%	90%
Last, on or after	March 15	February 27	January 31
First, on or before	November 13	November 30	December 15
Season at least	304 days	276 days	247 days

Station E MESA, AZ US (USC00022782). 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 98.2%. Freeze dates are conditional on that threshold occurring. Elevation 462.7 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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Mesa, AZ

Zone 9bAverage annual extreme minimum 25°F to 30°F

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

Arizona. Nearest qualified station: E MESA, AZ US (USC00022782), 4.4 miles. Median last 32°F February 1. Median first 32°F December 10. The 50% growing-season length is 312 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	February 28	February 1	January 1
First 32°F on or before	November 22	December 10	January 1

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 Arizona 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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