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🍂 First Frost Dates for Slippery Rock, Pennsylvania 16057

The first 36°F frost date is 30% likely to be on Sep 27. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 7. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Slippery Rock, 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 23
30% chanceSep 27
40% chanceSep 30
50% chanceOct 1
60% chanceOct 4
70% chanceOct 6
80% chanceOct 10
90% chanceOct 16
Probability of light freeze (32°F) on or before...
10% chanceOct 1
20% chanceOct 4
30% chanceOct 7
40% chanceOct 10
50% chanceOct 14
60% chanceOct 17
70% chanceOct 21
80% chanceOct 26
90% chanceNov 1
Probability of moderate freeze (28°F) on or before...
10% chanceOct 11
20% chanceOct 17
30% chanceOct 21
40% chanceOct 25
50% chanceOct 29
60% chanceNov 1
70% chanceNov 3
80% chanceNov 7
90% chanceNov 12
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 25
20% chanceOct 31
30% chanceNov 2
40% chanceNov 5
50% chanceNov 8
60% chanceNov 12
70% chanceNov 16
80% chanceNov 20
90% chanceNov 26
Probability of hard freeze (20°F) on or before...
10% chanceNov 3
20% chanceNov 8
30% chanceNov 13
40% chanceNov 17
50% chanceNov 21
60% chanceNov 25
70% chanceNov 30
80% chanceDec 4
90% chanceDec 10
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 13
20% chanceNov 21
30% chanceNov 26
40% chanceDec 1
50% chanceDec 3
60% chanceDec 7
70% chanceDec 11
80% chanceDec 16
90% chanceDec 22

Agricultural climatic data from weather station: SLIPPERY ROCK 1 SSW (USC00368184)

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