Frost dates for 19094Woodlyn, PA
The average last spring frost in Woodlyn is March 30 and the average first fall frost is November 16, giving a typical growing season of about 230 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Mar 30
- Average first fall frost
- Nov 16
- Growing season
- 230 days
Safer after Apr 9 (1-in-10 risk)
Possible by Nov 2 (1-in-10 risk)
First frost typically in 13 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) | Mar 30 · Apr 9 · Apr 22 | Oct 21 · Nov 2 · Nov 17 | 206 days | 100% |
| Frost / freeze (32°F) | Mar 16 · Mar 30 · Apr 9 | Nov 2 · Nov 16 · Dec 2 | 230 days | 100% |
| Hard freeze (28°F) | Mar 4 · Mar 20 · Mar 31 | Nov 11 · Nov 28 · Dec 15 | 252 days | 100% |
Planting calendar for Woodlyn
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 | Feb 27 – May 5 |
| Tomatoes | Transplant outdoors | Apr 15 – Jul 27 |
| Peppers | Start seeds indoors | Feb 27 – Mar 30 |
| Peppers | Transplant outdoors | Apr 29 – May 30 |
| Eggplant | Start seeds indoors | Mar 16 – Apr 14 |
| Eggplant | Transplant outdoors | Apr 29 – May 30 |
| Cucumbers | Sow outdoors | Apr 29 – Aug 6 |
| Summer squash | Sow outdoors | Apr 15 – May 30 |
| Winter squash & pumpkins | Sow outdoors | Apr 29 – May 30 |
| Snap beans | Sow outdoors | Apr 15 – Aug 29 |
| Sweet corn | Sow outdoors | Apr 15 – Jul 27 |
| Watermelon & cantaloupe | Sow outdoors | Apr 29 – May 30 |
| Okra | Sow outdoors | Apr 22 – May 15 |
| Peas | Sow outdoors (spring) | Feb 27 – Apr 14 |
| Potatoes | Plant outdoors (spring) | Feb 27 – Apr 29 |
| Onions | Start seeds indoors (spring) | Jan 16 – Feb 12 |
| Onions | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (spring) | Feb 9 – Mar 15 |
| Broccoli | Transplant outdoors (spring) | Mar 16 – Apr 14 |
| Broccoli | Start seeds indoors (fall) | Jul 17 – Jul 27 |
| Broccoli | Transplant outdoors (fall) | Aug 16 – Aug 27 |
| Cabbage | Start seeds indoors (spring) | Jan 30 – Feb 27 |
| Cabbage | Transplant outdoors (spring) | Feb 27 – Mar 30 |
| Cabbage | Start seeds indoors (fall) | Jul 7 – Aug 6 |
| Cabbage | Transplant outdoors (fall) | Aug 6 – Sep 6 |
| Leaf lettuce | Sow outdoors (spring) | Feb 27 – May 15 |
| Leaf lettuce | Sow outdoors (fall) | Aug 6 – Sep 22 |
| Spinach | Sow outdoors (spring) | Feb 20 – Apr 5 |
| Spinach | Sow outdoors (fall) | Aug 23 – Sep 27 |
| Radishes | Sow outdoors (spring) | Feb 27 – Apr 19 |
| Radishes | Sow outdoors (fall) | Aug 6 – Oct 7 |
| Kale | Sow outdoors (spring) | Mar 16 – Apr 5 |
| Kale | Sow outdoors (fall) | Jul 30 – Sep 6 |
| Carrots | Sow outdoors (spring) | Mar 30 – May 15 |
| Carrots | Sow outdoors (fall) | Jul 7 – Aug 22 |
| Garlic | Plant outdoors (fall) | Nov 6 – Dec 7 |
Where these dates come from
ZIP code 19094 is matched to the NOAA station Marcus Hook, PA, 9 km away, at 10 ft elevation (75 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Marcus Hook, PA (used) | 10 ft | Mar 30 | Nov 16 |
| Philadelphia Intl Ap, PA | 10 ft | Apr 2 | Nov 10 |
| Phila Franklin Inst, PA | 60 ft | Mar 30 | Nov 17 |
| Wilmington Porter Rsch, DE | 270 ft | Apr 7 | Nov 4 |
Frost dates near Woodlyn
- Crum Lynne, PA 19022 · last Apr 2, first Nov 10
- Folsom, PA 19033 · last Apr 2, first Nov 10
- Ridley Park, PA 19078 · last Apr 2, first Nov 10
- Swarthmore, PA 19081 · last Apr 2, first Nov 10
- Wallingford, PA 19086 · last Mar 30, first Nov 16
- Prospect Park, PA 19076 · last Apr 2, first Nov 10
- Holmes, PA 19098 · last Apr 2, first Nov 10
- Brookhaven, PA 19015 · last Mar 30, first Nov 16
Frequently asked questions
- When is the last frost in Woodlyn, PA?
- For ZIP code 19094, the average last spring frost (32°F) is March 30, based on NOAA 1991-2020 climate normals for the Marcus Hook, PA weather station. There is a 1-in-10 chance of a frost after April 9.
- When is the first frost in Woodlyn, PA?
- The average first fall frost (32°F) is November 16. There is a 1-in-10 chance of frost by November 2, so tender plants are at risk from that point on.
- How long is the growing season in 19094?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 230 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.