Frost dates for 18246Rock Glen, PA
The average last spring frost in Rock Glen is April 27 and the average first fall frost is October 20, giving a typical growing season of about 172 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 27
- Average first fall frost
- Oct 20
- Growing season
- 172 days
Safer after May 15 (1-in-10 risk)
Possible by Oct 4 (1-in-10 risk)
Last frost typically in 177 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 22 · May 9 · May 26 | Sep 24 · Oct 6 · Oct 22 | 148 days | 100% |
| Frost / freeze (32°F) | Apr 12 · Apr 27 · May 15 | Oct 4 · Oct 20 · Nov 5 | 172 days | 100% |
| Hard freeze (28°F) | Mar 28 · Apr 13 · May 3 | Oct 16 · Nov 2 · Nov 18 | 202 days | 100% |
Planting calendar for Rock Glen
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 | Mar 27 – Jun 2 |
| Tomatoes | Transplant outdoors | May 13 – Jun 30 |
| Peppers | Start seeds indoors | Mar 27 – Apr 27 |
| Peppers | Transplant outdoors | May 27 – Jun 27 |
| Eggplant | Start seeds indoors | Apr 13 – May 12 |
| Eggplant | Transplant outdoors | May 27 – Jun 27 |
| Cucumbers | Sow outdoors | May 27 – Jul 10 |
| Summer squash | Sow outdoors | May 13 – Jun 27 |
| Winter squash & pumpkins | Sow outdoors | May 27 – Jun 27 |
| Snap beans | Sow outdoors | May 13 – Aug 2 |
| Sweet corn | Sow outdoors | May 13 – Jun 30 |
| Watermelon & cantaloupe | Sow outdoors | May 27 – Jun 27 |
| Okra | Sow outdoors | May 20 – Jun 12 |
| Peas | Sow outdoors (spring) | Mar 27 – May 12 |
| Potatoes | Plant outdoors (spring) | Mar 27 – May 27 |
| Onions | Start seeds indoors (spring) | Feb 13 – Mar 12 |
| Onions | Transplant outdoors (spring) | Apr 13 – May 12 |
| Broccoli | Start seeds indoors (spring) | Mar 9 – Apr 12 |
| Broccoli | Transplant outdoors (spring) | Apr 13 – May 12 |
| Broccoli | Start seeds indoors (fall) | Jun 20 – Jun 30 |
| Broccoli | Transplant outdoors (fall) | Jul 20 – Jul 31 |
| Cabbage | Start seeds indoors (spring) | Feb 27 – Mar 27 |
| Cabbage | Transplant outdoors (spring) | Mar 27 – Apr 27 |
| Cabbage | Start seeds indoors (fall) | Jun 10 – Jul 10 |
| Cabbage | Transplant outdoors (fall) | Jul 10 – Aug 10 |
| Leaf lettuce | Sow outdoors (spring) | Mar 27 – Jun 12 |
| Leaf lettuce | Sow outdoors (fall) | Jul 10 – Aug 26 |
| Spinach | Sow outdoors (spring) | Mar 20 – May 3 |
| Spinach | Sow outdoors (fall) | Jul 27 – Aug 31 |
| Radishes | Sow outdoors (spring) | Mar 27 – May 17 |
| Radishes | Sow outdoors (fall) | Jul 10 – Sep 10 |
| Kale | Sow outdoors (spring) | Apr 13 – May 3 |
| Kale | Sow outdoors (fall) | Jul 3 – Aug 10 |
| Carrots | Sow outdoors (spring) | Apr 27 – Jun 12 |
| Carrots | Sow outdoors (fall) | Jun 10 – Jul 26 |
| Garlic | Plant outdoors (fall) | Oct 10 – Nov 10 |
Where these dates come from
ZIP code 18246 is matched to the NOAA station Bear Gap, PA, 30.9 km away, at 1,015 ft elevation (139 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bear Gap, PA (used) | 1,015 ft | Apr 27 | Oct 20 |
| Mahanoy City 2 N, PA | 1,710 ft | Apr 30 | Oct 22 |
| Benton 3 Ne, PA | 1,095 ft | May 4 | Oct 11 |
| Francis E Walter Dam, PA | 1,509 ft | May 7 | Oct 6 |
Frost dates near Rock Glen
- Nuremberg, PA 18241 · last Apr 30, first Oct 22
- Weston, PA 18256 · last Apr 30, first Oct 22
- Zion Grove, PA 17985 · last Apr 27, first Oct 20
- Oneida, PA 18242 · last Apr 30, first Oct 22
- Sheppton, PA 18248 · last Apr 30, first Oct 22
- Nescopeck, PA 18635 · last May 4, first Oct 11
- Sybertsville, PA 18251 · last Apr 23, first Oct 20
- Sugarloaf, PA 18249 · last Apr 23, first Oct 20
Frequently asked questions
- When is the last frost in Rock Glen, PA?
- For ZIP code 18246, the average last spring frost (32°F) is April 27, based on NOAA 1991-2020 climate normals for the Bear Gap, PA weather station. There is a 1-in-10 chance of a frost after May 15.
- When is the first frost in Rock Glen, PA?
- The average first fall frost (32°F) is October 20. There is a 1-in-10 chance of frost by October 4, so tender plants are at risk from that point on.
- How long is the growing season in 18246?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 172 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.