Frost dates for 18943Penns Park, PA
The average last spring frost in Penns Park is April 13 and the average first fall frost is October 30, giving a typical growing season of about 198 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 13
- Average first fall frost
- Oct 30
- Growing season
- 198 days
Safer after Apr 27 (1-in-10 risk)
Possible by Oct 15 (1-in-10 risk)
Last frost typically in 161 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 14 · Apr 27 · May 11 | Oct 5 · Oct 18 · Nov 1 | 173 days | 100% |
| Frost / freeze (32°F) | Apr 1 · Apr 13 · Apr 27 | Oct 15 · Oct 30 · Nov 12 | 198 days | 100% |
| Hard freeze (28°F) | Mar 17 · Apr 2 · Apr 14 | Oct 27 · Nov 10 · Nov 25 | 223 days | 100% |
Planting calendar for Penns Park
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 13 – May 19 |
| Tomatoes | Transplant outdoors | Apr 29 – Jul 10 |
| Peppers | Start seeds indoors | Mar 13 – Apr 13 |
| Peppers | Transplant outdoors | May 13 – Jun 13 |
| Eggplant | Start seeds indoors | Mar 30 – Apr 28 |
| Eggplant | Transplant outdoors | May 13 – Jun 13 |
| Cucumbers | Sow outdoors | May 13 – Jul 20 |
| Summer squash | Sow outdoors | Apr 29 – Jun 13 |
| Winter squash & pumpkins | Sow outdoors | May 13 – Jun 13 |
| Snap beans | Sow outdoors | Apr 29 – Aug 12 |
| Sweet corn | Sow outdoors | Apr 29 – Jul 10 |
| Watermelon & cantaloupe | Sow outdoors | May 13 – Jun 13 |
| Okra | Sow outdoors | May 6 – May 29 |
| Peas | Sow outdoors (spring) | Mar 13 – Apr 28 |
| Potatoes | Plant outdoors (spring) | Mar 13 – May 13 |
| Onions | Start seeds indoors (spring) | Jan 30 – Feb 26 |
| Onions | Transplant outdoors (spring) | Mar 30 – Apr 28 |
| Broccoli | Start seeds indoors (spring) | Feb 23 – Mar 29 |
| Broccoli | Transplant outdoors (spring) | Mar 30 – Apr 28 |
| Broccoli | Start seeds indoors (fall) | Jun 30 – Jul 10 |
| Broccoli | Transplant outdoors (fall) | Jul 30 – Aug 10 |
| Cabbage | Start seeds indoors (spring) | Feb 13 – Mar 13 |
| Cabbage | Transplant outdoors (spring) | Mar 13 – Apr 13 |
| Cabbage | Start seeds indoors (fall) | Jun 20 – Jul 20 |
| Cabbage | Transplant outdoors (fall) | Jul 20 – Aug 20 |
| Leaf lettuce | Sow outdoors (spring) | Mar 13 – May 29 |
| Leaf lettuce | Sow outdoors (fall) | Jul 20 – Sep 5 |
| Spinach | Sow outdoors (spring) | Mar 6 – Apr 19 |
| Spinach | Sow outdoors (fall) | Aug 6 – Sep 10 |
| Radishes | Sow outdoors (spring) | Mar 13 – May 3 |
| Radishes | Sow outdoors (fall) | Jul 20 – Sep 20 |
| Kale | Sow outdoors (spring) | Mar 30 – Apr 19 |
| Kale | Sow outdoors (fall) | Jul 13 – Aug 20 |
| Carrots | Sow outdoors (spring) | Apr 13 – May 29 |
| Carrots | Sow outdoors (fall) | Jun 20 – Aug 5 |
| Garlic | Plant outdoors (fall) | Oct 20 – Nov 20 |
Where these dates come from
ZIP code 18943 is matched to the NOAA station Doylestown Ap, PA, 11.7 km away, at 394 ft elevation (36 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Doylestown Ap, PA (used) | 394 ft | Apr 13 | Oct 30 |
| Lambertville, NJ | 68 ft | Apr 16 | Oct 19 |
| Willow Grove Nas, PA | 361 ft | Apr 11 | Nov 1 |
| Neshaminy Falls, PA | 40 ft | Apr 21 | Oct 25 |
Frost dates near Penns Park
- Rushland, PA 18956 · last Apr 13, first Oct 30
- Wycombe, PA 18980 · last Apr 13, first Oct 30
- Pineville, PA 18946 · last Apr 13, first Oct 30
- Newtown, PA 18940 · last Apr 10, first Nov 1
- Forest Grove, PA 18922 · last Apr 13, first Oct 30
- Furlong, PA 18925 · last Apr 13, first Oct 30
- Richboro, PA 18954 · last Apr 11, first Nov 1
- Buckingham, PA 18912 · last Apr 13, first Oct 30
Frequently asked questions
- When is the last frost in Penns Park, PA?
- For ZIP code 18943, the average last spring frost (32°F) is April 13, based on NOAA 1991-2020 climate normals for the Doylestown Ap, PA weather station. There is a 1-in-10 chance of a frost after April 27.
- When is the first frost in Penns Park, PA?
- The average first fall frost (32°F) is October 30. There is a 1-in-10 chance of frost by October 15, so tender plants are at risk from that point on.
- How long is the growing season in 18943?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 198 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.