Frost dates for 15605Greensburg, PA
The average last spring frost in Greensburg is May 2 and the average first fall frost is October 14, giving a typical growing season of about 163 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 2
- Average first fall frost
- Oct 14
- Growing season
- 163 days
Safer after May 18 (1-in-10 risk)
Possible by Oct 2 (1-in-10 risk)
Last frost typically in 180 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 14 · May 31 | Sep 22 · Oct 3 · Oct 17 | 142 days | 100% |
| Frost / freeze (32°F) | Apr 18 · May 2 · May 18 | Oct 2 · Oct 14 · Oct 27 | 163 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 22 · May 8 | Oct 9 · Oct 25 · Nov 6 | 187 days | 100% |
Planting calendar for Greensburg
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 1 – Jun 7 |
| Tomatoes | Transplant outdoors | May 18 – Jun 24 |
| Peppers | Start seeds indoors | Apr 1 – May 2 |
| Peppers | Transplant outdoors | Jun 1 – Jul 2 |
| Eggplant | Start seeds indoors | Apr 18 – May 17 |
| Eggplant | Transplant outdoors | Jun 1 – Jul 2 |
| Cucumbers | Sow outdoors | Jun 1 – Jul 4 |
| Summer squash | Sow outdoors | May 18 – Jul 2 |
| Winter squash & pumpkins | Sow outdoors | Jun 1 – Jul 2 |
| Snap beans | Sow outdoors | May 18 – Jul 27 |
| Sweet corn | Sow outdoors | May 18 – Jun 24 |
| Watermelon & cantaloupe | Sow outdoors | Jun 1 – Jul 2 |
| Okra | Sow outdoors | May 25 – Jun 17 |
| Peas | Sow outdoors (spring) | Apr 1 – May 17 |
| Potatoes | Plant outdoors (spring) | Apr 1 – Jun 1 |
| Onions | Start seeds indoors (spring) | Feb 18 – Mar 17 |
| Onions | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (spring) | Mar 14 – Apr 17 |
| Broccoli | Transplant outdoors (spring) | Apr 18 – May 17 |
| Broccoli | Start seeds indoors (fall) | Jun 14 – Jun 24 |
| Broccoli | Transplant outdoors (fall) | Jul 14 – Jul 25 |
| Cabbage | Start seeds indoors (spring) | Mar 4 – Apr 1 |
| Cabbage | Transplant outdoors (spring) | Apr 1 – May 2 |
| Cabbage | Start seeds indoors (fall) | Jun 4 – Jul 4 |
| Cabbage | Transplant outdoors (fall) | Jul 4 – Aug 4 |
| Leaf lettuce | Sow outdoors (spring) | Apr 1 – Jun 17 |
| Leaf lettuce | Sow outdoors (fall) | Jul 4 – Aug 20 |
| Spinach | Sow outdoors (spring) | Mar 25 – May 8 |
| Spinach | Sow outdoors (fall) | Jul 21 – Aug 25 |
| Radishes | Sow outdoors (spring) | Apr 1 – May 22 |
| Radishes | Sow outdoors (fall) | Jul 4 – Sep 4 |
| Kale | Sow outdoors (spring) | Apr 18 – May 8 |
| Kale | Sow outdoors (fall) | Jun 27 – Aug 4 |
| Carrots | Sow outdoors (spring) | May 2 – Jun 17 |
| Carrots | Sow outdoors (fall) | Jun 4 – Jul 20 |
| Garlic | Plant outdoors (fall) | Oct 4 – Nov 4 |
Where these dates come from
ZIP code 15605 is matched to the NOAA station Loyalhanna Lake, PA, 11 km away, at 990 ft elevation (204 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Loyalhanna Lake, PA (used) | 990 ft | May 2 | Oct 14 |
| Mt Pleasant, PA | 1,003 ft | May 1 | Oct 13 |
| Salina 3 W, PA | 1,109 ft | Apr 29 | Oct 20 |
| Murrysville 2 Sw, PA | 860 ft | Apr 22 | Oct 25 |
Frost dates near Greensburg
- Southwest, PA 15685 · last May 2, first Oct 14
- Crabtree, PA 15624 · last May 2, first Oct 14
- Luxor, PA 15662 · last May 2, first Oct 14
- New Alexandria, PA 15670 · last May 2, first Oct 14
- Hannastown, PA 15635 · last May 2, first Oct 14
- Forbes Road, PA 15633 · last May 2, first Oct 14
- Bovard, PA 15619 · last Apr 29, first Oct 20
- Latrobe, PA 15650 · last May 2, first Oct 14
Frequently asked questions
- When is the last frost in Greensburg, PA?
- For ZIP code 15605, the average last spring frost (32°F) is May 2, based on NOAA 1991-2020 climate normals for the Loyalhanna Lake, PA weather station. There is a 1-in-10 chance of a frost after May 18.
- When is the first frost in Greensburg, PA?
- The average first fall frost (32°F) is October 14. There is a 1-in-10 chance of frost by October 2, so tender plants are at risk from that point on.
- How long is the growing season in 15605?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 163 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.