Frost dates for 15310Aleppo, PA
The average last spring frost in Aleppo is May 4 and the average first fall frost is October 12, giving a typical growing season of about 158 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 4
- Average first fall frost
- Oct 12
- Growing season
- 158 days
Safer after May 22 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 182 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 29 · May 16 · May 31 | Sep 22 · Oct 3 · Oct 14 | 139 days | 100% |
| Frost / freeze (32°F) | Apr 20 · May 4 · May 22 | Oct 1 · Oct 12 · Oct 25 | 158 days | 100% |
| Hard freeze (28°F) | Apr 11 · Apr 24 · May 13 | Oct 9 · Oct 23 · Nov 3 | 180 days | 100% |
Planting calendar for Aleppo
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Apr 3 – Jun 9 |
| Tomatoes | Transplant outdoors | May 20 – Jun 22 |
| Peppers | Start seeds indoors | Apr 3 – May 4 |
| Peppers | Transplant outdoors | Jun 3 – Jul 4 |
| Eggplant | Start seeds indoors | Apr 20 – May 19 |
| Eggplant | Transplant outdoors | Jun 3 – Jul 4 |
| Cucumbers | Sow outdoors | Jun 3 – Jul 2 |
| Summer squash | Sow outdoors | May 20 – Jul 4 |
| Winter squash & pumpkins | Sow outdoors | Jun 3 – Jul 4 |
| Snap beans | Sow outdoors | May 20 – Jul 25 |
| Sweet corn | Sow outdoors | May 20 – Jun 22 |
| Watermelon & cantaloupe | Sow outdoors | Jun 3 – Jul 4 |
| Okra | Sow outdoors | May 27 – Jun 19 |
| Peas | Sow outdoors (spring) | Apr 3 – May 19 |
| Potatoes | Plant outdoors (spring) | Apr 3 – Jun 3 |
| Onions | Start seeds indoors (spring) | Feb 20 – Mar 19 |
| Onions | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (spring) | Mar 16 – Apr 19 |
| Broccoli | Transplant outdoors (spring) | Apr 20 – May 19 |
| Broccoli | Start seeds indoors (fall) | Jun 12 – Jun 22 |
| Broccoli | Transplant outdoors (fall) | Jul 12 – Jul 23 |
| Cabbage | Start seeds indoors (spring) | Mar 6 – Apr 3 |
| Cabbage | Transplant outdoors (spring) | Apr 3 – May 4 |
| Cabbage | Start seeds indoors (fall) | Jun 2 – Jul 2 |
| Cabbage | Transplant outdoors (fall) | Jul 2 – Aug 2 |
| Leaf lettuce | Sow outdoors (spring) | Apr 3 – Jun 19 |
| Leaf lettuce | Sow outdoors (fall) | Jul 2 – Aug 18 |
| Spinach | Sow outdoors (spring) | Mar 27 – May 10 |
| Spinach | Sow outdoors (fall) | Jul 19 – Aug 23 |
| Radishes | Sow outdoors (spring) | Apr 3 – May 24 |
| Radishes | Sow outdoors (fall) | Jul 2 – Sep 2 |
| Kale | Sow outdoors (spring) | Apr 20 – May 10 |
| Kale | Sow outdoors (fall) | Jun 25 – Aug 2 |
| Carrots | Sow outdoors (spring) | May 4 – Jun 19 |
| Carrots | Sow outdoors (fall) | Jun 2 – Jul 18 |
| Garlic | Plant outdoors (fall) | Oct 2 – Nov 2 |
Where these dates come from
ZIP code 15310 is matched to the NOAA station Burton, WV, 20.3 km away, at 1,240 ft elevation (72 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Burton, WV (used) | 1,240 ft | May 4 | Oct 12 |
| Waynesburg 1 E, PA | 940 ft | May 3 | Oct 15 |
| Moundsville, WV | 620 ft | Apr 26 | Oct 21 |
| Mannington 8 Wnw, WV | 1,100 ft | May 3 | Oct 10 |
Frost dates near Aleppo
- Wind Ridge, PA 15380 · last May 3, first Oct 15
- New Freeport, PA 15352 · last May 4, first Oct 12
- Cameron, WV 26033 · last May 4, first Oct 12
- Holbrook, PA 15341 · last May 4, first Oct 12
- Graysville, PA 15337 · last May 4, first Oct 12
- Hundred, WV 26575 · last May 4, first Oct 12
- Rogersville, PA 15359 · last May 3, first Oct 15
- Glen Easton, WV 26039 · last Apr 26, first Oct 21
Frequently asked questions
- When is the last frost in Aleppo, PA?
- For ZIP code 15310, the average last spring frost (32°F) is May 4, based on NOAA 1991-2020 climate normals for the Burton, WV weather station. There is a 1-in-10 chance of a frost after May 22.
- When is the first frost in Aleppo, PA?
- The average first fall frost (32°F) is October 12. There is a 1-in-10 chance of frost by October 1, so tender plants are at risk from that point on.
- How long is the growing season in 15310?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 158 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.