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🍂 First Frost Dates for Tucson, Arizona 85706

The first 36°F frost date is 30% likely to be on Nov 17. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Nov 28. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Tucson, 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% chanceNov 7
20% chanceNov 13
30% chanceNov 17
40% chanceNov 19
50% chanceNov 22
60% chanceNov 25
70% chanceNov 28
80% chanceDec 1
90% chanceDec 7
Probability of light freeze (32°F) on or before...
10% chanceNov 17
20% chanceNov 23
30% chanceNov 28
40% chanceDec 1
50% chanceDec 4
60% chanceDec 7
70% chanceDec 11
80% chanceDec 15
90% chanceDec 22
Probability of moderate freeze (28°F) on or before...
10% chanceNov 30
20% chanceDec 6
30% chanceDec 11
40% chanceDec 15
50% chanceDec 20
60% chanceDec 24
70% chanceDec 29
80% chanceJan 6
90% chanceJan 21
Probability of moderate hard freeze (24°F) on or before...
10% chanceDec 12
20% chanceDec 18
30% chanceDec 24
40% chanceDec 28
50% chanceDec 31
60% chanceJan 4
70% chanceJan 10
80% chanceJan 19
90% chanceJan 31
Probability of hard freeze (20°F) on or before...
10% chancerarely
20% chancerarely
30% chancerarely
40% chancerarely
50% chancerarely
60% chancerarely
70% chancerarely
80% chancerarely
90% chancerarely
Probability of severe hard freeze (16°F) on or before...
10% chancerarely
20% chancerarely
30% chancerarely
40% chancerarely
50% chancerarely
60% chancerarely
70% chancerarely
80% chancerarely
90% chancerarely

Agricultural climatic data from weather station: TUCSON INTL AP (USW00023160)

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