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🍂 First Frost Dates for Union Dale, Pennsylvania 18470

The first 36°F frost date is 30% likely to be on Sep 14. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Sep 25. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Union Dale, 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 5
20% chanceSep 10
30% chanceSep 14
40% chanceSep 17
50% chanceSep 19
60% chanceSep 22
70% chanceSep 24
80% chanceSep 27
90% chanceOct 1
Probability of light freeze (32°F) on or before...
10% chanceSep 17
20% chanceSep 22
30% chanceSep 25
40% chanceSep 28
50% chanceSep 30
60% chanceOct 2
70% chanceOct 4
80% chanceOct 7
90% chanceOct 11
Probability of moderate freeze (28°F) on or before...
10% chanceSep 28
20% chanceOct 1
30% chanceOct 4
40% chanceOct 6
50% chanceOct 9
60% chanceOct 12
70% chanceOct 15
80% chanceOct 20
90% chanceOct 27
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 6
20% chanceOct 11
30% chanceOct 16
40% chanceOct 19
50% chanceOct 23
60% chanceOct 27
70% chanceOct 31
80% chanceNov 4
90% chanceNov 10
Probability of hard freeze (20°F) on or before...
10% chanceOct 20
20% chanceOct 26
30% chanceOct 31
40% chanceNov 3
50% chanceNov 6
60% chanceNov 10
70% chanceNov 14
80% chanceNov 18
90% chanceNov 23
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 3
20% chanceNov 9
30% chanceNov 13
40% chanceNov 17
50% chanceNov 20
60% chanceNov 23
70% chanceNov 27
80% chanceDec 1
90% chanceDec 6

Agricultural climatic data from weather station: PLEASANT MT 1 W (USC00367029)

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