Frost dates for 15510Somerset, PA
The average last spring frost in Somerset is May 6 and the average first fall frost is October 12, giving a typical growing season of about 159 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- May 6
- Average first fall frost
- Oct 12
- Growing season
- 159 days
Safer after May 23 (1-in-10 risk)
Possible by Oct 1 (1-in-10 risk)
Last frost typically in 184 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 30 · May 16 · Jun 1 | Sep 21 · Oct 3 · Oct 15 | 138 days | 100% |
| Frost / freeze (32°F) | Apr 22 · May 6 · May 23 | Oct 1 · Oct 12 · Oct 26 | 159 days | 100% |
| Hard freeze (28°F) | Apr 14 · Apr 27 · May 15 | Oct 10 · Oct 24 · Nov 5 | 179 days | 100% |
Planting calendar for Somerset
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 5 – Jun 11 |
| Tomatoes | Transplant outdoors | May 22 – Jun 22 |
| Peppers | Start seeds indoors | Apr 5 – May 6 |
| Peppers | Transplant outdoors | Jun 5 – Jul 6 |
| Eggplant | Start seeds indoors | Apr 22 – May 21 |
| Eggplant | Transplant outdoors | Jun 5 – Jul 6 |
| Cucumbers | Sow outdoors | Jun 5 – Jul 2 |
| Summer squash | Sow outdoors | May 22 – Jul 6 |
| Winter squash & pumpkins | Sow outdoors | Jun 5 – Jul 6 |
| Snap beans | Sow outdoors | May 22 – Jul 25 |
| Sweet corn | Sow outdoors | May 22 – Jun 22 |
| Watermelon & cantaloupe | Sow outdoors | Jun 5 – Jul 6 |
| Okra | Sow outdoors | May 29 – Jun 21 |
| Peas | Sow outdoors (spring) | Apr 5 – May 21 |
| Potatoes | Plant outdoors (spring) | Apr 5 – Jun 5 |
| Onions | Start seeds indoors (spring) | Feb 22 – Mar 21 |
| Onions | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (spring) | Mar 18 – Apr 21 |
| Broccoli | Transplant outdoors (spring) | Apr 22 – May 21 |
| Broccoli | Start seeds indoors (fall) | Jun 12 – Jun 22 |
| Broccoli | Transplant outdoors (fall) | Jul 12 – Jul 23 |
| Cabbage | Start seeds indoors (spring) | Mar 8 – Apr 5 |
| Cabbage | Transplant outdoors (spring) | Apr 5 – May 6 |
| Cabbage | Start seeds indoors (fall) | Jun 2 – Jul 2 |
| Cabbage | Transplant outdoors (fall) | Jul 2 – Aug 2 |
| Leaf lettuce | Sow outdoors (spring) | Apr 5 – Jun 21 |
| Leaf lettuce | Sow outdoors (fall) | Jul 2 – Aug 18 |
| Spinach | Sow outdoors (spring) | Mar 29 – May 12 |
| Spinach | Sow outdoors (fall) | Jul 19 – Aug 23 |
| Radishes | Sow outdoors (spring) | Apr 5 – May 26 |
| Radishes | Sow outdoors (fall) | Jul 2 – Sep 2 |
| Kale | Sow outdoors (spring) | Apr 22 – May 12 |
| Kale | Sow outdoors (fall) | Jun 25 – Aug 2 |
| Carrots | Sow outdoors (spring) | May 6 – Jun 21 |
| Carrots | Sow outdoors (fall) | Jun 2 – Jul 18 |
| Garlic | Plant outdoors (fall) | Oct 2 – Nov 2 |
Where these dates come from
ZIP code 15510 is matched to the NOAA station Laurel Summit, PA, 24.4 km away, at 2,730 ft elevation (256 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Laurel Summit, PA (used) | 2,730 ft | May 6 | Oct 12 |
| Meyersdale 2 Ssw, PA | 2,000 ft | May 12 | Oct 5 |
| Hidden Valley, PA | 2,876 ft | May 2 | Oct 17 |
| Laurel Mtn, PA | 2,760 ft | Apr 26 | Oct 17 |
Frost dates near Somerset
- Listie, PA 15549 · last May 12, first Oct 5
- Somerset, PA 15501 · last May 12, first Oct 5
- Berlin, PA 15530 · last May 12, first Oct 5
- Garrett, PA 15542 · last May 12, first Oct 5
- Rockwood, PA 15557 · last May 12, first Oct 5
- Shanksville, PA 15560 · last Apr 29, first Oct 21
- Friedens, PA 15541 · last Apr 29, first Oct 21
- Quecreek, PA 15555 · last Apr 30, first Oct 17
Frequently asked questions
- When is the last frost in Somerset, PA?
- For ZIP code 15510, the average last spring frost (32°F) is May 6, based on NOAA 1991-2020 climate normals for the Laurel Summit, PA weather station. There is a 1-in-10 chance of a frost after May 23.
- When is the first frost in Somerset, 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 15510?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 159 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.