Frost dates / Arizona / Scottsdale

Frost dates in Scottsdale, AZ

The station on this page is PINNACLE PEAK, AZ US (USC00026603), 3 miles from the city point. Population in the Census 2024 estimate is 246,170.

Zone 10aUSDA average annual extreme minimum 30°F to 35°F, from ZIP 85255 (2.5 miles from the city point used on this page).

Median last 32°F is January 27. Median first 32°F is December 21. The 50% growing-season length is 330 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%	December 23	Earlier date. A last 32°F on or after this day is common.
50%	January 27	Median.
10%	March 5	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 28	Earlier date. A first 32°F on or before this day is uncommon.
50%	December 21	Median.
90%	January 24	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%	365
50%	330
90%	285

28°F threshold

	10%	50%	90%
Last, on or after	February 8	January 6	December 14
First, on or before	December 6	January 1	February 2
Season at least	365 days	365 days	331 days

36°F threshold

	10%	50%	90%
Last, on or after	March 30	February 26	January 17
First, on or before	November 19	December 7	December 24
Season at least	325 days	285 days	245 days

Station PINNACLE PEAK, AZ US (USC00026603). Completeness flag R, 16 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 91%. Freeze dates are conditional on that threshold occurring. Elevation 781.8 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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Scottsdale, AZ

Zone 10aAverage annual extreme minimum 30°F to 35°F

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

Arizona. Nearest qualified station: PINNACLE PEAK, AZ US (USC00026603), 3 miles. Median last 32°F January 27. Median first 32°F December 21. The 50% growing-season length is 330 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 5	January 27	December 23
First 32°F on or before	November 28	December 21	January 24

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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