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🍂 First Frost Dates for Whiteriver, Arizona 85941

The first 36°F frost date is 30% likely to be on Oct 4. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 13. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Whiteriver, AZ are based on historical climate data.

Always check your local forecast for the most up-to-date frost warnings.

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What is a First Frost Date?

The first fall frost signals the end of your local growing season. This date serves as an important deadline for gardeners and farmers. You'll need to complete harvesting before this point. Annuals and other tender plants will die back when frost hits, and perennial plants will enter their dormant phase for winter. Meanwhile, it's time to enjoy a cup of hot cocoa and a cozy sweater—and start planning your spring garden!

How to use the First Frost Date?

Watch your local weather forecasts in early fall to predict the first frost date. Harvest tender crops and protect vulnerable plants before frost arrives. For late-summer plantings, count backward from your area's average first frost date. This ensures your crops have enough time to mature. Keep track of when frost actually occurs in your garden each year. This helps you identify protected spots where the growing season might last longer.

First Frost Date Probabilities

Probability of frost (36°F) on or before...
10% chanceSep 29
20% chanceOct 2
30% chanceOct 4
40% chanceOct 7
50% chanceOct 9
60% chanceOct 12
70% chanceOct 15
80% chanceOct 17
90% chanceOct 21
Probability of light freeze (32°F) on or before...
10% chanceOct 6
20% chanceOct 10
30% chanceOct 13
40% chanceOct 16
50% chanceOct 18
60% chanceOct 21
70% chanceOct 24
80% chanceOct 27
90% chanceNov 1
Probability of moderate freeze (28°F) on or before...
10% chanceOct 14
20% chanceOct 18
30% chanceOct 22
40% chanceOct 25
50% chanceOct 28
60% chanceOct 31
70% chanceNov 3
80% chanceNov 6
90% chanceNov 11
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 24
20% chanceOct 29
30% chanceNov 1
40% chanceNov 5
50% chanceNov 8
60% chanceNov 12
70% chanceNov 16
80% chanceNov 19
90% chanceNov 24
Probability of hard freeze (20°F) on or before...
10% chanceNov 4
20% chanceNov 11
30% chanceNov 16
40% chanceNov 20
50% chanceNov 23
60% chanceNov 26
70% chanceNov 30
80% chanceDec 3
90% chanceDec 7
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 19
20% chanceNov 25
30% chanceNov 29
40% chanceDec 2
50% chanceDec 5
60% chanceDec 8
70% chanceDec 12
80% chanceDec 17
90% chanceDec 24

Agricultural climatic data from weather station: WHITERIVER 1 SW (USC00029271)

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