Frost dates for 18077Riegelsville, PA
The average last spring frost in Riegelsville is April 29 and the average first fall frost is October 16, giving a typical growing season of about 170 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 29
- Average first fall frost
- Oct 16
- Growing season
- 170 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 26 · May 10 · May 25 | Sep 26 · Oct 6 · Oct 19 | 149 days | 100% |
| Frost / freeze (32°F) | Apr 16 · Apr 29 · May 15 | Oct 4 · Oct 16 · Nov 1 | 170 days | 100% |
| Hard freeze (28°F) | Apr 2 · Apr 17 · May 2 | Oct 12 · Oct 28 · Nov 8 | 193 days | 100% |
Planting calendar for Riegelsville
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 29 – Jun 4 |
| Tomatoes | Transplant outdoors | May 15 – Jun 26 |
| Peppers | Start seeds indoors | Mar 29 – Apr 29 |
| Peppers | Transplant outdoors | May 29 – Jun 29 |
| Eggplant | Start seeds indoors | Apr 15 – May 14 |
| Eggplant | Transplant outdoors | May 29 – Jun 29 |
| Cucumbers | Sow outdoors | May 29 – Jul 6 |
| Summer squash | Sow outdoors | May 15 – Jun 29 |
| Winter squash & pumpkins | Sow outdoors | May 29 – Jun 29 |
| Snap beans | Sow outdoors | May 15 – Jul 29 |
| Sweet corn | Sow outdoors | May 15 – Jun 26 |
| Watermelon & cantaloupe | Sow outdoors | May 29 – Jun 29 |
| Okra | Sow outdoors | May 22 – Jun 14 |
| Peas | Sow outdoors (spring) | Mar 29 – May 14 |
| Potatoes | Plant outdoors (spring) | Mar 29 – May 29 |
| Onions | Start seeds indoors (spring) | Feb 15 – Mar 14 |
| Onions | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (spring) | Mar 11 – Apr 14 |
| Broccoli | Transplant outdoors (spring) | Apr 15 – May 14 |
| Broccoli | Start seeds indoors (fall) | Jun 16 – Jun 26 |
| Broccoli | Transplant outdoors (fall) | Jul 16 – Jul 27 |
| Cabbage | Start seeds indoors (spring) | Mar 1 – Mar 29 |
| Cabbage | Transplant outdoors (spring) | Mar 29 – Apr 29 |
| Cabbage | Start seeds indoors (fall) | Jun 6 – Jul 6 |
| Cabbage | Transplant outdoors (fall) | Jul 6 – Aug 6 |
| Leaf lettuce | Sow outdoors (spring) | Mar 29 – Jun 14 |
| Leaf lettuce | Sow outdoors (fall) | Jul 6 – Aug 22 |
| Spinach | Sow outdoors (spring) | Mar 22 – May 5 |
| Spinach | Sow outdoors (fall) | Jul 23 – Aug 27 |
| Radishes | Sow outdoors (spring) | Mar 29 – May 19 |
| Radishes | Sow outdoors (fall) | Jul 6 – Sep 6 |
| Kale | Sow outdoors (spring) | Apr 15 – May 5 |
| Kale | Sow outdoors (fall) | Jun 29 – Aug 6 |
| Carrots | Sow outdoors (spring) | Apr 29 – Jun 14 |
| Carrots | Sow outdoors (fall) | Jun 6 – Jul 22 |
| Garlic | Plant outdoors (fall) | Oct 6 – Nov 6 |
Where these dates come from
ZIP code 18077 is matched to the NOAA station Bucksville, PA, 8.8 km away, at 387 ft elevation (184 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Bucksville, PA (used) | 387 ft | Apr 29 | Oct 16 |
| Springtown 1 Nne, PA | 860 ft | Apr 21 | Oct 22 |
| Phillipsburg-Easton Brg, NJ | 232 ft | Apr 18 | Oct 25 |
| Allentown Intl Ap, PA | 390 ft | Apr 20 | Oct 24 |
Frost dates near Riegelsville
- Durham, PA 18039 · last Apr 29, first Oct 16
- Kintnersville, PA 18930 · last Apr 29, first Oct 16
- Ferndale, PA 18921 · last Apr 29, first Oct 16
- Springtown, PA 18081 · last Apr 29, first Oct 16
- Easton, PA 18042 · last Apr 21, first Oct 22
- Revere, PA 18953 · last Apr 29, first Oct 16
- Upper Black Eddy, PA 18972 · last Apr 29, first Oct 16
- Hellertown, PA 18055 · last Apr 20, first Oct 24
Frequently asked questions
- When is the last frost in Riegelsville, PA?
- For ZIP code 18077, the average last spring frost (32°F) is April 29, based on NOAA 1991-2020 climate normals for the Bucksville, PA weather station. There is a 1-in-10 chance of a frost after May 15.
- When is the first frost in Riegelsville, PA?
- The average first fall frost (32°F) is October 16. 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 18077?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 170 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.