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🍂 First Frost Dates for McKees Rocks, Pennsylvania 15136

The first 36°F frost date is 30% likely to be on Oct 3. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 14. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for McKees Rocks, 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 27
20% chanceOct 1
30% chanceOct 3
40% chanceOct 5
50% chanceOct 7
60% chanceOct 10
70% chanceOct 13
80% chanceOct 17
90% chanceOct 21
Probability of light freeze (32°F) on or before...
10% chanceOct 6
20% chanceOct 10
30% chanceOct 14
40% chanceOct 17
50% chanceOct 20
60% chanceOct 23
70% chanceOct 27
80% chanceOct 30
90% chanceNov 3
Probability of moderate freeze (28°F) on or before...
10% chanceOct 17
20% chanceOct 23
30% chanceOct 27
40% chanceOct 31
50% chanceNov 2
60% chanceNov 4
70% chanceNov 7
80% chanceNov 11
90% chanceNov 17
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 31
20% chanceNov 4
30% chanceNov 8
40% chanceNov 11
50% chanceNov 14
60% chanceNov 18
70% chanceNov 21
80% chanceNov 26
90% chanceDec 1
Probability of hard freeze (20°F) on or before...
10% chanceNov 10
20% chanceNov 15
30% chanceNov 20
40% chanceNov 24
50% chanceNov 27
60% chanceDec 1
70% chanceDec 4
80% chanceDec 8
90% chanceDec 14
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 20
20% chanceNov 27
30% chanceDec 1
40% chanceDec 4
50% chanceDec 8
60% chanceDec 11
70% chanceDec 16
80% chanceDec 21
90% chanceDec 27

Agricultural climatic data from weather station: PITTSBURGH INTL AP (USW00094823)

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