Frost dates for 18076Red Hill, PA
The average last spring frost in Red Hill is April 26 and the average first fall frost is October 17, giving a typical growing season of about 175 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 26
- Average first fall frost
- Oct 17
- Growing season
- 175 days
Safer after May 12 (1-in-10 risk)
Possible by Oct 5 (1-in-10 risk)
Last frost typically in 174 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 23 · May 6 · May 23 | Sep 28 · Oct 7 · Oct 22 | 154 days | 100% |
| Frost / freeze (32°F) | Apr 12 · Apr 26 · May 12 | Oct 5 · Oct 17 · Nov 1 | 175 days | 100% |
| Hard freeze (28°F) | Mar 30 · Apr 13 · Apr 30 | Oct 13 · Oct 28 · Nov 10 | 198 days | 100% |
Planting calendar for Red Hill
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 26 – Jun 1 |
| Tomatoes | Transplant outdoors | May 12 – Jun 27 |
| Peppers | Start seeds indoors | Mar 26 – Apr 26 |
| Peppers | Transplant outdoors | May 26 – Jun 26 |
| Eggplant | Start seeds indoors | Apr 12 – May 11 |
| Eggplant | Transplant outdoors | May 26 – Jun 26 |
| Cucumbers | Sow outdoors | May 26 – Jul 7 |
| Summer squash | Sow outdoors | May 12 – Jun 26 |
| Winter squash & pumpkins | Sow outdoors | May 26 – Jun 26 |
| Snap beans | Sow outdoors | May 12 – Jul 30 |
| Sweet corn | Sow outdoors | May 12 – Jun 27 |
| Watermelon & cantaloupe | Sow outdoors | May 26 – Jun 26 |
| Okra | Sow outdoors | May 19 – Jun 11 |
| Peas | Sow outdoors (spring) | Mar 26 – May 11 |
| Potatoes | Plant outdoors (spring) | Mar 26 – May 26 |
| Onions | Start seeds indoors (spring) | Feb 12 – Mar 11 |
| Onions | Transplant outdoors (spring) | Apr 12 – May 11 |
| Broccoli | Start seeds indoors (spring) | Mar 8 – Apr 11 |
| Broccoli | Transplant outdoors (spring) | Apr 12 – May 11 |
| Broccoli | Start seeds indoors (fall) | Jun 17 – Jun 27 |
| Broccoli | Transplant outdoors (fall) | Jul 17 – Jul 28 |
| Cabbage | Start seeds indoors (spring) | Feb 26 – Mar 26 |
| Cabbage | Transplant outdoors (spring) | Mar 26 – Apr 26 |
| Cabbage | Start seeds indoors (fall) | Jun 7 – Jul 7 |
| Cabbage | Transplant outdoors (fall) | Jul 7 – Aug 7 |
| Leaf lettuce | Sow outdoors (spring) | Mar 26 – Jun 11 |
| Leaf lettuce | Sow outdoors (fall) | Jul 7 – Aug 23 |
| Spinach | Sow outdoors (spring) | Mar 19 – May 2 |
| Spinach | Sow outdoors (fall) | Jul 24 – Aug 28 |
| Radishes | Sow outdoors (spring) | Mar 26 – May 16 |
| Radishes | Sow outdoors (fall) | Jul 7 – Sep 7 |
| Kale | Sow outdoors (spring) | Apr 12 – May 2 |
| Kale | Sow outdoors (fall) | Jun 30 – Aug 7 |
| Carrots | Sow outdoors (spring) | Apr 26 – Jun 11 |
| Carrots | Sow outdoors (fall) | Jun 7 – Jul 23 |
| Garlic | Plant outdoors (fall) | Oct 7 – Nov 7 |
Where these dates come from
ZIP code 18076 is matched to the NOAA station Sellersville, PA, 14.7 km away, at 302 ft elevation (46 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Sellersville, PA (used) | 302 ft | Apr 26 | Oct 17 |
| Pottstown Limerick Ap, PA | 291 ft | Apr 20 | Oct 23 |
| Graterford 1 E, PA | 279 ft | Apr 24 | Oct 15 |
| Bucksville, PA | 387 ft | Apr 29 | Oct 16 |
Frost dates near Red Hill
- Pennsburg, PA 18073 · last Apr 26, first Oct 17
- East Greenville, PA 18041 · last Apr 26, first Oct 17
- Green Lane, PA 18054 · last Apr 26, first Oct 17
- Sumneytown, PA 18084 · last Apr 24, first Oct 15
- Perkiomenville, PA 18074 · last Apr 20, first Oct 23
- Palm, PA 18070 · last Apr 26, first Oct 17
- Barto, PA 19504 · last Apr 20, first Oct 23
- Woxall, PA 18979 · last Apr 24, first Oct 15
Frequently asked questions
- When is the last frost in Red Hill, PA?
- For ZIP code 18076, the average last spring frost (32°F) is April 26, based on NOAA 1991-2020 climate normals for the Sellersville, PA weather station. There is a 1-in-10 chance of a frost after May 12.
- When is the first frost in Red Hill, PA?
- The average first fall frost (32°F) is October 17. There is a 1-in-10 chance of frost by October 5, so tender plants are at risk from that point on.
- How long is the growing season in 18076?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 175 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.