Frost dates / Arizona / Apache Junction

Frost dates in Apache Junction, AZ

The station on this page is APACHE JUNCTION 5 NE, AZ US (USC00020288), 6.5 miles from the city point. Population in the Census 2024 estimate is 44,309.

Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 85120 (1.3 miles from the city point used on this page).

Median last 32°F is February 11. Median first 32°F is December 10. The 50% growing-season length is 304 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 5	Earlier date. A last 32°F on or after this day is common.
50%	February 11	Median.
10%	March 7	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 19	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%	341
50%	304
90%	269

28°F threshold

	10%	50%	90%
Last, on or after	February 18	January 13	December 12
First, on or before	November 28	December 22	February 1
Season at least	365 days	344 days	307 days

36°F threshold

	10%	50%	90%
Last, on or after	April 1	March 6	February 7
First, on or before	November 7	November 28	December 15
Season at least	302 days	266 days	229 days

Station APACHE JUNCTION 5 NE, AZ US (USC00020288). Completeness flag S, 27 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 98.5%. Freeze dates are conditional on that threshold occurring. Elevation 630.9 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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Apache Junction, 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: APACHE JUNCTION 5 NE, AZ US (USC00020288), 6.5 miles. Median last 32°F February 11. Median first 32°F December 10. The 50% growing-season length is 304 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 7	February 11	January 5
First 32°F on or before	November 19	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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