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🍂 First Frost Dates for Duncannon, Pennsylvania 17020

The first 36°F frost date is 30% likely to be on Oct 5. (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 Duncannon, 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 29
20% chanceOct 2
30% chanceOct 5
40% chanceOct 7
50% chanceOct 9
60% chanceOct 12
70% chanceOct 14
80% chanceOct 17
90% chanceOct 22
Probability of light freeze (32°F) on or before...
10% chanceOct 7
20% chanceOct 11
30% chanceOct 14
40% chanceOct 17
50% chanceOct 19
60% chanceOct 22
70% chanceOct 25
80% chanceOct 29
90% chanceNov 2
Probability of moderate freeze (28°F) on or before...
10% chanceOct 17
20% chanceOct 22
30% chanceOct 26
40% chanceOct 29
50% chanceNov 1
60% chanceNov 3
70% chanceNov 6
80% chanceNov 10
90% chanceNov 15
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 30
20% chanceNov 3
30% chanceNov 7
40% chanceNov 10
50% chanceNov 13
60% chanceNov 17
70% chanceNov 20
80% chanceNov 24
90% chanceNov 30
Probability of hard freeze (20°F) on or before...
10% chanceNov 10
20% chanceNov 15
30% chanceNov 20
40% chanceNov 24
50% chanceNov 28
60% chanceDec 1
70% chanceDec 4
80% chanceDec 8
90% chanceDec 14
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 24
20% chanceDec 1
30% chanceDec 4
40% chanceDec 7
50% chanceDec 10
60% chanceDec 14
70% chanceDec 17
80% chanceDec 22
90% chanceDec 27

Agricultural climatic data from weather station: NEWPORT RIVER (USC00366297)

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