🌷 Your Ultimate Garden Calendar!

🍂 First Frost Dates for Allentown, Pennsylvania 18106

The first 36°F frost date is 30% likely to be on Sep 24. (See detailed probabilities below.)

The first 32°F light freeze date is 30% likely to be on Oct 3. (See detailed probabilities below.)

(See also 🌷 Last Spring Frost Dates.)

First frost date probabilities for Allentown, PA are based on historical climate data.

Always check your local forecast for the most up-to-date frost warnings.

Book Recommendations (ads!)

📚 Growing Under Cover: Techniques for a More Productive, Weather-Resistant, Pest-Free Vegetable Garden

📚 Greenhouse Gardening for Beginners: Step By Step Guide To Build A Year-Round Greenhouse And Grow Herbs, Organic Fruits And Vegetables, Plants, Flowers Plans & Ideas for Extending the Growing Season

📚 How to Garden Indoors & Grow Your Own Food Year Round: Ultimate Guide to Vertical, Container, and Hydroponic Gardening (Creative Homeowner) Vegetables, Herbs, DIY Projects, Composting, Lights, & More

📚 The Year-Round Vegetable Gardener: How to Grow Your Own Food 365 Days a Year, No Matter Where You Live

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 21
30% chanceSep 24
40% chanceSep 27
50% chanceSep 30
60% chanceOct 2
70% chanceOct 4
80% chanceOct 7
90% chanceOct 12
Probability of light freeze (32°F) on or before...
10% chanceSep 25
20% chanceSep 30
30% chanceOct 3
40% chanceOct 5
50% chanceOct 8
60% chanceOct 11
70% chanceOct 14
80% chanceOct 18
90% chanceOct 23
Probability of moderate freeze (28°F) on or before...
10% chanceOct 4
20% chanceOct 8
30% chanceOct 13
40% chanceOct 16
50% chanceOct 19
60% chanceOct 23
70% chanceOct 27
80% chanceNov 1
90% chanceNov 6
Probability of moderate hard freeze (24°F) on or before...
10% chanceOct 16
20% chanceOct 22
30% chanceOct 27
40% chanceOct 31
50% chanceNov 3
60% chanceNov 6
70% chanceNov 11
80% chanceNov 16
90% chanceNov 22
Probability of hard freeze (20°F) on or before...
10% chanceOct 30
20% chanceNov 5
30% chanceNov 10
40% chanceNov 15
50% chanceNov 19
60% chanceNov 22
70% chanceNov 26
80% chanceDec 1
90% chanceDec 7
Probability of severe hard freeze (16°F) on or before...
10% chanceNov 15
20% chanceNov 21
30% chanceNov 26
40% chanceNov 30
50% chanceDec 3
60% chanceDec 6
70% chanceDec 11
80% chanceDec 16
90% chanceDec 22

Agricultural climatic data from weather station: RODALE RSCH CTR (USC00367578)

Back to Weather Calendar