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🍂 First Frost Dates for Hackettstown, New Jersey 07840

The first 36°F frost date is 30% likely to be on Sep 29. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 6. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: LONG VALLEY (USC00285003)

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