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🍂 First Frost Dates for Highspire, Pennsylvania 17034

The first 36°F frost date is 30% likely to be on Oct 10. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 23. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Highspire, 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% chanceOct 3
20% chanceOct 7
30% chanceOct 10
40% chanceOct 13
50% chanceOct 17
60% chanceOct 19
70% chanceOct 23
80% chanceOct 26
90% chanceNov 1
Probability of light freeze (32°F) on or before...
10% chanceOct 13
20% chanceOct 19
30% chanceOct 23
40% chanceOct 26
50% chanceOct 29
60% chanceNov 1
70% chanceNov 3
80% chanceNov 6
90% chanceNov 10
Probability of moderate freeze (28°F) on or before...
10% chanceOct 24
20% chanceOct 29
30% chanceNov 2
40% chanceNov 5
50% chanceNov 8
60% chanceNov 11
70% chanceNov 14
80% chanceNov 17
90% chanceNov 22
Probability of moderate hard freeze (24°F) on or before...
10% chanceNov 4
20% chanceNov 10
30% chanceNov 14
40% chanceNov 17
50% chanceNov 20
60% chanceNov 23
70% chanceNov 27
80% chanceDec 1
90% chanceDec 7
Probability of hard freeze (20°F) on or before...
10% chanceNov 18
20% chanceNov 23
30% chanceNov 28
40% chanceDec 1
50% chanceDec 5
60% chanceDec 8
70% chanceDec 12
80% chanceDec 17
90% chanceDec 23
Probability of severe hard freeze (16°F) on or before...
10% chanceDec 2
20% chanceDec 6
30% chanceDec 11
40% chanceDec 15
50% chanceDec 19
60% chanceDec 23
70% chanceDec 27
80% chanceDec 31
90% chanceJan 8

Agricultural climatic data from weather station: MIDDLETOWN HARRISBURG INTL AP (USW00014711)

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