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🍂 First Frost Dates for Hopatcong, New Jersey 07843

The first 36°F frost date is 30% likely to be on Sep 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 5. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

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

Agricultural climatic data from weather station: NEWTON (USC00286177)

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