Frost dates / Arizona / Gilbert

Frost dates in Gilbert, AZ

The station on this page is CHANDLER HEIGHTS, AZ US (USC00021514), 8 miles from the city point. Population in the Census 2024 estimate is 288,790.

Zone 9bUSDA average annual extreme minimum 25°F to 30°F, from ZIP 85295 (0.5 miles from the city point used on this page).

Median last 32°F is February 1. Median first 32°F is December 11. The 50% growing-season length is 315 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 2	Earlier date. A last 32°F on or after this day is common.
50%	February 1	Median.
10%	February 27	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 23	Earlier date. A first 32°F on or before this day is uncommon.
50%	December 11	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%	347
50%	315
90%	281

28°F threshold

	10%	50%	90%
Last, on or after	February 11	January 8	December 15
First, on or before	December 4	December 26	January 29
Season at least	365 days	357 days	322 days

36°F threshold

	10%	50%	90%
Last, on or after	March 11	February 21	January 29
First, on or before	November 12	November 28	December 14
Season at least	311 days	280 days	248 days

Station CHANDLER HEIGHTS, AZ US (USC00021514). Completeness flag R, 14 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 98.8%. Freeze dates are conditional on that threshold occurring. Elevation 434.3 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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Gilbert, 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: CHANDLER HEIGHTS, AZ US (USC00021514), 8 miles. Median last 32°F February 1. Median first 32°F December 11. The 50% growing-season length is 315 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	February 27	February 1	January 2
First 32°F on or before	November 23	December 11	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.

Date checks use your device’s calendar and appear after the page loads.