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🍂 First Frost Dates for Ronkonkoma, New York 11779

The first 36°F frost date is 30% likely to be on Oct 11. (See detailed probabilities below.)

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

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Ronkonkoma, NY 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 5
20% chanceOct 9
30% chanceOct 11
40% chanceOct 14
50% chanceOct 17
60% chanceOct 19
70% chanceOct 22
80% chanceOct 26
90% chanceNov 1
Probability of light freeze (32°F) on or before...
10% chanceOct 14
20% chanceOct 19
30% chanceOct 23
40% chanceOct 26
50% chanceOct 29
60% chanceNov 1
70% chanceNov 3
80% chanceNov 7
90% chanceNov 13
Probability of moderate freeze (28°F) on or before...
10% chanceOct 27
20% chanceNov 1
30% chanceNov 4
40% chanceNov 8
50% chanceNov 12
60% chanceNov 15
70% chanceNov 19
80% chanceNov 22
90% chanceNov 28
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 10
20% chanceNov 16
30% chanceNov 20
40% chanceNov 23
50% chanceNov 26
60% chanceNov 30
70% chanceDec 2
80% chanceDec 5
90% chanceDec 11
Probability of hard freeze (20°F) on or before...
10% chanceNov 23
20% chanceNov 29
30% chanceDec 2
40% chanceDec 4
50% chanceDec 7
60% chanceDec 11
70% chanceDec 15
80% chanceDec 20
90% chanceDec 26
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 2
20% chanceDec 7
30% chanceDec 12
40% chanceDec 17
50% chanceDec 21
60% chanceDec 25
70% chanceDec 30
80% chanceJan 3
90% chanceJan 11

Agricultural climatic data from weather station: ISLIP LI MACARTHUR AP (USW00004781)

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