Frost dates / Arizona / Peoria

Frost dates in Peoria, AZ

The station on this page is WITTMANN 1SE, AZ US (USC00029464), 12.4 miles from the city point. Population in the Census 2024 estimate is 199,924.

Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 85383 (0.9 miles from the city point used on this page).

Median last 32°F is February 5. Median first 32°F is December 11. The 50% growing-season length is 306 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 6	Earlier date. A last 32°F on or after this day is common.
50%	February 5	Median.
10%	March 3	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 20	Earlier date. A first 32°F on or before this day is uncommon.
50%	December 11	Median.
90%	January 2	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%	306
90%	270

28°F threshold

	10%	50%	90%
Last, on or after	February 12	January 15	December 14
First, on or before	December 4	December 27	January 28
Season at least	365 days	345 days	311 days

36°F threshold

	10%	50%	90%
Last, on or after	April 2	March 4	February 6
First, on or before	November 8	November 26	December 14
Season at least	297 days	266 days	232 days

Station WITTMANN 1SE, AZ US (USC00029464). Completeness flag R, 20 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 98.9%. Freeze dates are conditional on that threshold occurring. Elevation 513 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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Peoria, 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: WITTMANN 1SE, AZ US (USC00029464), 12.4 miles. Median last 32°F February 5. Median first 32°F December 11. The 50% growing-season length is 306 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	March 3	February 5	January 6
First 32°F on or before	November 20	December 11	January 2

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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