The last 36°F Spring frost date is 30% likely to be on May 8. (See detailed probabilities below.)
The last 32°F light freeze date is 30% likely to be on Apr 28. (See detailed probabilities below.)
(See also 🍂 First Fall Frost Dates.)
Last frost date probabilities for Berwyn, PA are based on historical climate data.
Always check your local forecast for the most up-to-date frost warnings.
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The last spring frost signals when your area is safe from freezing temperatures. Tender plants can now grow outdoors without cold damage! This marks the beginning of the growing season. Last spring frost serves as your essential starting point for planting warm-season crops. It's also time to remove winter protection from your perennials. Enjoy the longer days and warmer weather!
Start seeds indoors several weeks before your last frost date. This gives plants time to reach transplanting size when weather permits. Plan your outdoor planting schedule around your area's average last frost date. Plant some crops before and some after this date to protect against weather changes. Look for spots in your yard where frost stays longer or disappears earlier. Create your own frost map to use all available growing space and extend your season. Keep watching your local weather forecast to catch any surprise late frosts.
| Probability of frost (36°F) on or after… | |
|---|---|
| 10% chance | May 18 |
| 20% chance | May 12 |
| 30% chance | May 8 |
| 40% chance | May 5 |
| 50% chance | May 2 |
| 60% chance | Apr 30 |
| 70% chance | Apr 27 |
| 80% chance | Apr 24 |
| 90% chance | Apr 20 |
| Probability of light freeze (32°F) on or after… | |
|---|---|
| 10% chance | May 6 |
| 20% chance | May 1 |
| 30% chance | Apr 28 |
| 40% chance | Apr 25 |
| 50% chance | Apr 21 |
| 60% chance | Apr 18 |
| 70% chance | Apr 15 |
| 80% chance | Apr 12 |
| 90% chance | Apr 7 |
| Probability of moderate freeze (28°F) on or after… | |
|---|---|
| 10% chance | Apr 23 |
| 20% chance | Apr 18 |
| 30% chance | Apr 15 |
| 40% chance | Apr 11 |
| 50% chance | Apr 8 |
| 60% chance | Apr 5 |
| 70% chance | Apr 2 |
| 80% chance | Mar 31 |
| 90% chance | Mar 24 |
| Probability of moderate hard freeze (24°F) on or after… | |
|---|---|
| 10% chance | Apr 14 |
| 20% chance | Apr 8 |
| 30% chance | Apr 4 |
| 40% chance | Apr 1 |
| 50% chance | Mar 29 |
| 60% chance | Mar 26 |
| 70% chance | Mar 22 |
| 80% chance | Mar 17 |
| 90% chance | Mar 12 |
| Probability of hard freeze (20°F) on or after… | |
|---|---|
| 10% chance | Apr 4 |
| 20% chance | Mar 30 |
| 30% chance | Mar 26 |
| 40% chance | Mar 22 |
| 50% chance | Mar 18 |
| 60% chance | Mar 14 |
| 70% chance | Mar 10 |
| 80% chance | Mar 6 |
| 90% chance | Mar 1 |
| Probability of severe hard freeze (16°F) on or after… | |
|---|---|
| 10% chance | Mar 25 |
| 20% chance | Mar 19 |
| 30% chance | Mar 14 |
| 40% chance | Mar 10 |
| 50% chance | Mar 5 |
| 60% chance | Mar 2 |
| 70% chance | Feb 27 |
| 80% chance | Feb 22 |
| 90% chance | Feb 15 |
Agricultural climatic data from weather station: VALLEY FORGE NHP (USC00369103)