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🍂 First Frost Dates for Tarentum, Pennsylvania 15084

The first 36°F frost date is 30% likely to be on Sep 25. (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 Tarentum, 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 22
30% chanceSep 25
40% chanceSep 28
50% chanceOct 1
60% chanceOct 2
70% chanceOct 5
80% chanceOct 8
90% chanceOct 13
Probability of light freeze (32°F) on or before...
10% chanceSep 29
20% chanceOct 2
30% chanceOct 5
40% chanceOct 8
50% chanceOct 11
60% chanceOct 15
70% chanceOct 18
80% chanceOct 22
90% chanceOct 28
Probability of moderate freeze (28°F) on or before...
10% chanceOct 10
20% chanceOct 16
30% chanceOct 19
40% chanceOct 22
50% chanceOct 26
60% chanceOct 29
70% chanceNov 1
80% chanceNov 4
90% chanceNov 9
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 22
20% chanceOct 28
30% chanceNov 1
40% chanceNov 3
50% chanceNov 6
60% chanceNov 10
70% chanceNov 13
80% chanceNov 18
90% chanceNov 24
Probability of hard freeze (20°F) on or before...
10% chanceNov 1
20% chanceNov 7
30% chanceNov 12
40% chanceNov 17
50% chanceNov 21
60% chanceNov 25
70% chanceNov 28
80% chanceDec 2
90% chanceDec 9
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 12
20% chanceNov 20
30% chanceNov 26
40% chanceNov 30
50% chanceDec 2
60% chanceDec 7
70% chanceDec 11
80% chanceDec 16
90% chanceDec 22

Agricultural climatic data from weather station: BUTLER 2 SW (USC00361139)

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