Frost dates for 15311Amity, PA
The average last spring frost in Amity is May 3 and the average first fall frost is October 15, giving a typical growing season of about 164 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 3
- Average first fall frost
- Oct 15
- Growing season
- 164 days
Safer after May 21 (1-in-10 risk)
Possible by Oct 2 (1-in-10 risk)
Last frost typically in 181 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 29 | Sep 23 · Oct 5 · Oct 18 | 144 days | 100% |
| Frost / freeze (32°F) | Apr 19 · May 3 · May 21 | Oct 2 · Oct 15 · Oct 28 | 164 days | 100% |
| Hard freeze (28°F) | Apr 7 · Apr 22 · May 11 | Oct 11 · Oct 25 · Nov 6 | 184 days | 100% |
Planting calendar for Amity
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 2 – Jun 8 |
| Tomatoes | Transplant outdoors | May 19 – Jun 25 |
| Peppers | Start seeds indoors | Apr 2 – May 3 |
| Peppers | Transplant outdoors | Jun 2 – Jul 3 |
| Eggplant | Start seeds indoors | Apr 19 – May 18 |
| Eggplant | Transplant outdoors | Jun 2 – Jul 3 |
| Cucumbers | Sow outdoors | Jun 2 – Jul 5 |
| Summer squash | Sow outdoors | May 19 – Jul 3 |
| Winter squash & pumpkins | Sow outdoors | Jun 2 – Jul 3 |
| Snap beans | Sow outdoors | May 19 – Jul 28 |
| Sweet corn | Sow outdoors | May 19 – Jun 25 |
| Watermelon & cantaloupe | Sow outdoors | Jun 2 – Jul 3 |
| Okra | Sow outdoors | May 26 – Jun 18 |
| Peas | Sow outdoors (spring) | Apr 2 – May 18 |
| Potatoes | Plant outdoors (spring) | Apr 2 – Jun 2 |
| Onions | Start seeds indoors (spring) | Feb 19 – Mar 18 |
| Onions | Transplant outdoors (spring) | Apr 19 – May 18 |
| Broccoli | Start seeds indoors (spring) | Mar 15 – Apr 18 |
| Broccoli | Transplant outdoors (spring) | Apr 19 – May 18 |
| Broccoli | Start seeds indoors (fall) | Jun 15 – Jun 25 |
| Broccoli | Transplant outdoors (fall) | Jul 15 – Jul 26 |
| Cabbage | Start seeds indoors (spring) | Mar 5 – Apr 2 |
| Cabbage | Transplant outdoors (spring) | Apr 2 – May 3 |
| Cabbage | Start seeds indoors (fall) | Jun 5 – Jul 5 |
| Cabbage | Transplant outdoors (fall) | Jul 5 – Aug 5 |
| Leaf lettuce | Sow outdoors (spring) | Apr 2 – Jun 18 |
| Leaf lettuce | Sow outdoors (fall) | Jul 5 – Aug 21 |
| Spinach | Sow outdoors (spring) | Mar 26 – May 9 |
| Spinach | Sow outdoors (fall) | Jul 22 – Aug 26 |
| Radishes | Sow outdoors (spring) | Apr 2 – May 23 |
| Radishes | Sow outdoors (fall) | Jul 5 – Sep 5 |
| Kale | Sow outdoors (spring) | Apr 19 – May 9 |
| Kale | Sow outdoors (fall) | Jun 28 – Aug 5 |
| Carrots | Sow outdoors (spring) | May 3 – Jun 18 |
| Carrots | Sow outdoors (fall) | Jun 5 – Jul 21 |
| Garlic | Plant outdoors (fall) | Oct 5 – Nov 5 |
Where these dates come from
ZIP code 15311 is matched to the NOAA station Waynesburg 1 E, PA, 16.8 km away, at 940 ft elevation (136 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Waynesburg 1 E, PA (used) | 940 ft | May 3 | Oct 15 |
| Washington 3 Ne, PA | 1,300 ft | Apr 24 | Oct 23 |
| Charleroi Lock 4, PA | 749 ft | Apr 13 | Nov 5 |
| Donora 1 Sw, PA | 762 ft | Apr 27 | Oct 22 |
Frost dates near Amity
- Marianna, PA 15345 · last May 3, first Oct 15
- Prosperity, PA 15329 · last May 3, first Oct 15
- Scenery Hill, PA 15360 · last Apr 24, first Oct 23
- Cokeburg, PA 15324 · last Apr 24, first Oct 23
- Beallsville, PA 15313 · last Apr 24, first Oct 23
- Clarksville, PA 15322 · last May 3, first Oct 15
- Ellsworth, PA 15331 · last Apr 27, first Oct 22
- Richeyville, PA 15358 · last Apr 24, first Oct 23
Frequently asked questions
- When is the last frost in Amity, PA?
- For ZIP code 15311, the average last spring frost (32°F) is May 3, based on NOAA 1991-2020 climate normals for the Waynesburg 1 E, PA weather station. There is a 1-in-10 chance of a frost after May 21.
- When is the first frost in Amity, PA?
- The average first fall frost (32°F) is October 15. 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 15311?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 164 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.