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🍂 First Frost Dates for Harriman, Tennessee 37748

The first 36°F frost date is 30% likely to be on Oct 19. (See detailed probabilities below.)

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

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Harriman, TN 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% chanceOct 11
20% chanceOct 16
30% chanceOct 19
40% chanceOct 22
50% chanceOct 25
60% chanceOct 27
70% chanceOct 30
80% chanceNov 2
90% chanceNov 7
Probability of light freeze (32°F) on or before...
10% chanceOct 21
20% chanceOct 26
30% chanceOct 30
40% chanceNov 1
50% chanceNov 4
60% chanceNov 6
70% chanceNov 9
80% chanceNov 13
90% chanceNov 19
Probability of moderate freeze (28°F) on or before...
10% chanceNov 2
20% chanceNov 7
30% chanceNov 11
40% chanceNov 15
50% chanceNov 18
60% chanceNov 21
70% chanceNov 26
80% chanceDec 1
90% chanceDec 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 13
20% chanceNov 20
30% chanceNov 25
40% chanceNov 29
50% chanceDec 1
60% chanceDec 4
70% chanceDec 8
80% chanceDec 12
90% chanceDec 20
Probability of hard freeze (20°F) on or before...
10% chanceNov 27
20% chanceDec 2
30% chanceDec 6
40% chanceDec 9
50% chanceDec 13
60% chanceDec 17
70% chanceDec 22
80% chanceDec 27
90% chanceJan 2
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 7
20% chanceDec 12
30% chanceDec 17
40% chanceDec 22
50% chanceDec 26
60% chanceDec 30
70% chanceJan 3
80% chanceJan 10
90% chanceJan 20

Agricultural climatic data from weather station: KINGSTON (USC00404871)

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