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🍂 First Frost Dates for Sweet Valley, Pennsylvania 18656

The first 36°F frost date is 30% likely to be on Sep 23. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 3. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Sweet Valley, PA 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 16
20% chanceSep 20
30% chanceSep 23
40% chanceSep 26
50% chanceSep 29
60% chanceOct 1
70% chanceOct 3
80% chanceOct 5
90% chanceOct 9
Probability of light freeze (32°F) on or before...
10% chanceSep 27
20% chanceOct 1
30% chanceOct 3
40% chanceOct 5
50% chanceOct 8
60% chanceOct 10
70% chanceOct 13
80% chanceOct 17
90% chanceOct 22
Probability of moderate freeze (28°F) on or before...
10% chanceOct 5
20% chanceOct 10
30% chanceOct 14
40% chanceOct 17
50% chanceOct 20
60% chanceOct 23
70% chanceOct 26
80% chanceOct 30
90% chanceNov 4
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 17
20% chanceOct 22
30% chanceOct 26
40% chanceOct 30
50% chanceNov 2
60% chanceNov 5
70% chanceNov 9
80% chanceNov 14
90% chanceNov 20
Probability of hard freeze (20°F) on or before...
10% chanceOct 31
20% chanceNov 5
30% chanceNov 10
40% chanceNov 14
50% chanceNov 18
60% chanceNov 21
70% chanceNov 25
80% chanceNov 30
90% chanceDec 5
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 15
20% chanceNov 20
30% chanceNov 24
40% chanceNov 28
50% chanceDec 1
60% chanceDec 3
70% chanceDec 6
80% chanceDec 11
90% chanceDec 17

Agricultural climatic data from weather station: LAPORTE (USC00364815)

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