🍂 2026 First Frost Dates for Calvin, Pennsylvania 16622
The first 36°F frost date is 30% likely to be on Oct 8. (See detailed probabilities below.)
The first 32°F light freeze date is 30% likely to be on Oct 22. (See detailed probabilities below.)
(See also 🌷 Last Spring Frost Dates.)
First frost date probabilities for Calvin, 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
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% chance | Oct 1 |
| 20% chance | Oct 5 |
| 30% chance | Oct 8 |
| 40% chance | Oct 12 |
| 50% chance | Oct 15 |
| 60% chance | Oct 18 |
| 70% chance | Oct 22 |
| 80% chance | Oct 26 |
| 90% chance | Oct 31 |
| Probability of light freeze (32°F) on or before... | |
|---|---|
| 10% chance | Oct 12 |
| 20% chance | Oct 18 |
| 30% chance | Oct 22 |
| 40% chance | Oct 25 |
| 50% chance | Oct 28 |
| 60% chance | Nov 1 |
| 70% chance | Nov 3 |
| 80% chance | Nov 5 |
| 90% chance | Nov 10 |
| Probability of moderate freeze (28°F) on or before... | |
|---|---|
| 10% chance | Oct 26 |
| 20% chance | Nov 1 |
| 30% chance | Nov 4 |
| 40% chance | Nov 6 |
| 50% chance | Nov 9 |
| 60% chance | Nov 12 |
| 70% chance | Nov 15 |
| 80% chance | Nov 18 |
| 90% chance | Nov 23 |
| Probability of moderate hard freeze (24°F) on or before... | |
|---|---|
| 10% chance | Nov 7 |
| 20% chance | Nov 11 |
| 30% chance | Nov 14 |
| 40% chance | Nov 17 |
| 50% chance | Nov 20 |
| 60% chance | Nov 24 |
| 70% chance | Nov 27 |
| 80% chance | Dec 1 |
| 90% chance | Dec 8 |
| Probability of hard freeze (20°F) on or before... | |
|---|---|
| 10% chance | Nov 17 |
| 20% chance | Nov 23 |
| 30% chance | Nov 28 |
| 40% chance | Dec 1 |
| 50% chance | Dec 5 |
| 60% chance | Dec 10 |
| 70% chance | Dec 15 |
| 80% chance | Dec 20 |
| 90% chance | Dec 26 |
| Probability of severe hard freeze (16°F) on or before... | |
|---|---|
| 10% chance | Dec 1 |
| 20% chance | Dec 7 |
| 30% chance | Dec 12 |
| 40% chance | Dec 17 |
| 50% chance | Dec 21 |
| 60% chance | Dec 25 |
| 70% chance | Dec 29 |
| 80% chance | Jan 1 |
| 90% chance | Jan 9 |
Agricultural climatic data from weather station: RAYSTOWN LAKE 2 (USC00367312:frost)