Frost dates / Arizona / Lake Havasu City

Frost dates in Lake Havasu City, AZ

The station on this page is LAKE HAVASU CITY, AZ US (USC00024761), 2.8 miles from the city point. Population in the Census 2024 estimate is 59,037.

Zone 10aUSDA average annual extreme minimum 30°F to 35°F, from ZIP 86403 (2.5 miles from the city point used on this page).

Median last 32°F is January 5. Median first 32°F is December 29. The 50% growing-season length is 365 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 17	Earlier date. A last 32°F on or after this day is common.
50%	January 5	Median.
10%	February 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%	December 9	Earlier date. A first 32°F on or before this day is uncommon.
50%	December 29	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%	365
90%	334

36°F threshold

	10%	50%	90%
Last, on or after	February 19	January 25	December 30
First, on or before	December 1	December 17	January 6
Season at least	355 days	329 days	298 days

Station LAKE HAVASU CITY, AZ US (USC00024761). Completeness flag R, 17 years used for the 32°F dates. NCEI’s annual probability of at least one day at or below 32°F is 49.1%. Freeze dates are conditional on that threshold occurring. Elevation 136.9 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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Lake Havasu City, 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: LAKE HAVASU CITY, AZ US (USC00024761), 2.8 miles. Median last 32°F January 5. Median first 32°F December 29. The 50% growing-season length is 365 days.

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32°F probabilities at this station

	10%	50%	90%
Last 32°F on or after	February 3	January 5	December 17
First 32°F on or before	December 9	December 29	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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