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🍂 First Frost Dates for San Antonio, Texas 78203

The first 36°F frost date is 30% likely to be on Nov 12. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Nov 23. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for San Antonio, TX 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 2
20% chanceNov 7
30% chanceNov 12
40% chanceNov 15
50% chanceNov 19
60% chanceNov 22
70% chanceNov 25
80% chanceNov 29
90% chanceDec 4
Probability of light freeze (32°F) on or before...
10% chanceNov 13
20% chanceNov 19
30% chanceNov 23
40% chanceNov 27
50% chanceNov 30
60% chanceDec 3
70% chanceDec 5
80% chanceDec 10
90% chanceDec 18
Probability of moderate freeze (28°F) on or before...
10% chanceNov 25
20% chanceDec 1
30% chanceDec 4
40% chanceDec 7
50% chanceDec 11
60% chanceDec 16
70% chanceDec 22
80% chanceDec 29
90% chanceJan 9
Probability of moderate hard freeze (24°F) on or before...
10% chanceDec 4
20% chanceDec 8
30% chanceDec 14
40% chanceDec 19
50% chanceDec 25
60% chanceDec 30
70% chanceJan 3
80% chanceJan 13
90% chanceJan 27
Probability of hard freeze (20°F) on or before...
10% chanceDec 8
20% chanceDec 14
30% chanceDec 19
40% chanceDec 25
50% chanceDec 30
60% chanceJan 2
70% chanceJan 9
80% chanceJan 19
90% chanceFeb 1
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 9
20% chanceDec 14
30% chanceDec 19
40% chanceDec 25
50% chanceDec 29
60% chanceJan 1
70% chanceJan 5
80% chanceJan 12
90% chanceJan 26

Agricultural climatic data from weather station: SAN ANTONIO STINSON AP (USW00012970)

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