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🍂 First Frost Dates for Hatfield, Pennsylvania 19440

The first 36°F frost date is 30% likely to be on Oct 1. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 10. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Hatfield, 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 26
20% chanceSep 30
30% chanceOct 1
40% chanceOct 3
50% chanceOct 5
60% chanceOct 7
70% chanceOct 9
80% chanceOct 13
90% chanceOct 17
Probability of light freeze (32°F) on or before...
10% chanceOct 4
20% chanceOct 7
30% chanceOct 10
40% chanceOct 13
50% chanceOct 15
60% chanceOct 18
70% chanceOct 21
80% chanceOct 25
90% chanceOct 30
Probability of moderate freeze (28°F) on or before...
10% chanceOct 12
20% chanceOct 17
30% chanceOct 20
40% chanceOct 24
50% chanceOct 27
60% chanceOct 30
70% chanceNov 2
80% chanceNov 5
90% chanceNov 11
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 23
20% chanceOct 29
30% chanceNov 1
40% chanceNov 5
50% chanceNov 9
60% chanceNov 12
70% chanceNov 16
80% chanceNov 21
90% chanceNov 27
Probability of hard freeze (20°F) on or before...
10% chanceNov 4
20% chanceNov 11
30% chanceNov 15
40% chanceNov 20
50% chanceNov 24
60% chanceNov 28
70% chanceDec 1
80% chanceDec 5
90% chanceDec 11
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 18
20% chanceNov 26
30% chanceDec 1
40% chanceDec 4
50% chanceDec 7
60% chanceDec 11
70% chanceDec 14
80% chanceDec 19
90% chanceDec 25

Agricultural climatic data from weather station: SELLERSVILLE (USC00367938)

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