Frost dates for 17778Westport, PA
The average last spring frost in Westport is May 10 and the average first fall frost is October 16, giving a typical growing season of about 157 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 10
- Average first fall frost
- Oct 16
- Growing season
- 157 days
Safer after May 27 (1-in-10 risk)
Possible by Oct 2 (1-in-10 risk)
Last frost typically in 188 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) | May 5 · May 23 · Jun 4 | Sep 22 · Oct 4 · Oct 18 | 135 days | 100% |
| Frost / freeze (32°F) | Apr 25 · May 10 · May 27 | Oct 2 · Oct 16 · Oct 30 | 157 days | 100% |
| Hard freeze (28°F) | Apr 15 · Apr 30 · May 15 | Oct 14 · Oct 29 · Nov 10 | 181 days | 100% |
Planting calendar for Westport
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 9 – Jun 15 |
| Tomatoes | Transplant outdoors | May 26 – Jun 26 |
| Peppers | Start seeds indoors | Apr 9 – May 10 |
| Peppers | Transplant outdoors | Jun 9 – Jul 10 |
| Eggplant | Start seeds indoors | Apr 26 – May 25 |
| Eggplant | Transplant outdoors | Jun 9 – Jul 10 |
| Cucumbers | Sow outdoors | Jun 9 – Jul 6 |
| Summer squash | Sow outdoors | May 26 – Jul 10 |
| Winter squash & pumpkins | Sow outdoors | Jun 9 – Jul 10 |
| Snap beans | Sow outdoors | May 26 – Jul 29 |
| Sweet corn | Sow outdoors | May 26 – Jun 26 |
| Watermelon & cantaloupe | Sow outdoors | Jun 9 – Jul 10 |
| Okra | Sow outdoors | Jun 2 – Jun 25 |
| Peas | Sow outdoors (spring) | Apr 9 – May 25 |
| Potatoes | Plant outdoors (spring) | Apr 9 – Jun 9 |
| Onions | Start seeds indoors (spring) | Feb 26 – Mar 25 |
| Onions | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (spring) | Mar 22 – Apr 25 |
| Broccoli | Transplant outdoors (spring) | Apr 26 – May 25 |
| Broccoli | Start seeds indoors (fall) | Jun 16 – Jun 26 |
| Broccoli | Transplant outdoors (fall) | Jul 16 – Jul 27 |
| Cabbage | Start seeds indoors (spring) | Mar 12 – Apr 9 |
| Cabbage | Transplant outdoors (spring) | Apr 9 – May 10 |
| Cabbage | Start seeds indoors (fall) | Jun 6 – Jul 6 |
| Cabbage | Transplant outdoors (fall) | Jul 6 – Aug 6 |
| Leaf lettuce | Sow outdoors (spring) | Apr 9 – Jun 25 |
| Leaf lettuce | Sow outdoors (fall) | Jul 6 – Aug 22 |
| Spinach | Sow outdoors (spring) | Apr 2 – May 16 |
| Spinach | Sow outdoors (fall) | Jul 23 – Aug 27 |
| Radishes | Sow outdoors (spring) | Apr 9 – May 30 |
| Radishes | Sow outdoors (fall) | Jul 6 – Sep 6 |
| Kale | Sow outdoors (spring) | Apr 26 – May 16 |
| Kale | Sow outdoors (fall) | Jun 29 – Aug 6 |
| Carrots | Sow outdoors (spring) | May 10 – Jun 25 |
| Carrots | Sow outdoors (fall) | Jun 6 – Jul 22 |
| Garlic | Plant outdoors (fall) | Oct 6 – Nov 6 |
Where these dates come from
ZIP code 17778 is matched to the NOAA station Stevenson Dam, PA, 16.1 km away, at 932 ft elevation (459 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Stevenson Dam, PA (used) | 932 ft | May 10 | Oct 16 |
| Alvin R Bush Dam, PA | 930 ft | Apr 29 | Oct 21 |
| Renovo, PA | 660 ft | Apr 30 | Oct 22 |
| Clarence, PA | 1,390 ft | May 21 | Sep 27 |
Frost dates near Westport
- Pottersdale, PA 16871 · last May 21, first Sep 27
- Sinnamahoning, PA 15861 · last May 14, first Oct 4
- Renovo, PA 17764 · last Apr 30, first Oct 22
- Karthaus, PA 16845 · last May 21, first Sep 27
- Driftwood, PA 15832 · last May 7, first Oct 15
- Clarence, PA 16829 · last May 21, first Sep 27
- Cross Fork, PA 17729 · last May 22, first Oct 1
- Snow Shoe, PA 16874 · last May 21, first Sep 27
Frequently asked questions
- When is the last frost in Westport, PA?
- For ZIP code 17778, the average last spring frost (32°F) is May 10, based on NOAA 1991-2020 climate normals for the Stevenson Dam, PA weather station. There is a 1-in-10 chance of a frost after May 27.
- When is the first frost in Westport, PA?
- The average first fall frost (32°F) is October 16. 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 17778?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 157 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.