Frost dates for 19112 — Philadelphia, PA
How Philadelphia compares
- In 8 years out of 10, the last spring frost in Philadelphia falls between March 19 and April 13, a 25-day window. The first fall frost falls between October 30 and November 24.
- The median last frost is 25 days earlier than the Pennsylvania median of Apr 27.
- Its 222-day growing season is longer than 97% of the 1,787 Pennsylvania places with a regular frost season (state median 175 days).
- The last frost is typical for zone 7b, where the median is Apr 5.
- The weather station records an average of 77 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | March 19 |
| 50% (median) | April 2 |
| 10% (safe for tender plants) | April 13 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 30 |
| 50% (median) | November 10 |
| 90% (late) | November 24 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for Philadelphia, PA
Frost dates for 19112 — Philadelphia, PA — last frost Apr 2, first frost Nov 10, zone 7b. whenisthelastfrost.com
When to plant vegetables in Philadelphia, PA
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Jan 8 – Jan 22 | Mar 5 – Mar 19 | — | — |
| Peppers | Jan 22 – Feb 5 | Apr 16 – Apr 30 | — | — |
| Eggplant | Jan 22 – Feb 5 | Apr 16 – Apr 30 | — | — |
| Tomatoes | Feb 5 – Feb 19 | Apr 9 – Apr 23 | — | — |
| Lettuce | Feb 5 – Feb 19 | Mar 12 – Mar 26 | Mar 5 – Apr 9 | Sep 15 – Oct 13 |
| Kale | Feb 5 – Feb 19 | Mar 5 – Mar 19 | Mar 5 – Mar 19 | Sep 1 – Sep 22 |
| Broccoli | Feb 5 – Feb 19 | Mar 19 – Apr 2 | — | Aug 4 – Aug 25 |
| Cabbage | Feb 5 – Feb 19 | Mar 12 – Mar 26 | — | Aug 4 – Aug 25 |
| Cauliflower | Feb 5 – Feb 19 | Mar 19 – Apr 2 | — | Aug 4 – Aug 25 |
| Okra | Feb 19 – Mar 5 | Apr 23 – May 7 | Apr 23 – May 7 | — |
| Basil | Feb 19 – Mar 5 | Apr 9 – Apr 23 | — | — |
| Peas | — | — | Feb 19 – Mar 12 | Aug 18 – Sep 8 |
| Spinach | — | — | Feb 19 – Mar 12 | Sep 15 – Oct 6 |
| Radishes | — | — | Feb 26 – Apr 9 | Sep 29 – Oct 20 |
| Cucumbers | Mar 5 – Mar 12 | Apr 16 – Apr 23 | Apr 9 – Apr 23 | Aug 25 – Sep 8 |
| Zucchini & Summer Squash | Mar 5 – Mar 12 | — | Apr 9 – Apr 23 | Sep 1 – Sep 15 |
| Winter Squash & Pumpkins | Mar 5 – Mar 12 | — | Apr 9 – Apr 23 | — |
| Melons & Watermelon | Mar 5 – Mar 12 | Apr 16 – Apr 30 | — | — |
| Carrots | — | — | Mar 12 – Apr 9 | Aug 18 – Sep 1 |
| Beets | — | — | Mar 12 – Apr 9 | Sep 1 – Sep 15 |
| Potatoes | — | — | Mar 12 – Apr 2 | — |
| Swiss Chard | — | — | Mar 19 – Apr 16 | Sep 1 – Sep 15 |
| Cilantro | — | — | Mar 19 – Apr 9 | Sep 15 – Oct 6 |
| Green Beans | — | — | Apr 9 – Apr 30 | Aug 25 – Sep 8 |
| Sweet Corn | — | — | Apr 9 – Apr 23 | — |
| Sweet Potatoes | — | Apr 16 – May 7 | — | — |
| Garlic | — | — | — | Oct 27 – Dec 1 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the Philadelphia Intl Ap, PA weather station, 5 km away (elevation 10 ft (3 m)).
ZIP codes in Philadelphia: 19019 19092 19093 19099 19101 19102 19103 19104 19105 19106 19107 19108 19109 19110 19111 19112 19113 19114 19115 19116 19118 19119 19120 19121 19122 19123 19124 19125 19126 19127 19128 19129 19130 19131 19132 19133 19134 19135 19136 19137 19138 19139 19140 19141 19142 19143 19144 19145 19146 19147 19148 19149 19150 19151 19152 19153 19154 19155 19160 19161 …
Frost dates near Philadelphia
- Sharon Hill Apr 2 · Nov 10
- Darby Apr 2 · Nov 10
- Folcroft Apr 2 · Nov 10
- Lansdowne Mar 30 · Nov 17
- Clifton Heights Apr 2 · Nov 10
- Glenolden Apr 2 · Nov 10
- Norwood Apr 2 · Nov 10
- Essington Apr 2 · Nov 10
Frequently asked questions
When is the last frost in Philadelphia, PA?
The median last spring frost in Philadelphia, PA is April 2. There is still about a 10% chance of frost after April 13, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in Philadelphia, PA?
The median first fall frost is November 10, with about a 10% chance of frost before October 30.
How long is the growing season in Philadelphia, PA?
About 222 days between the median last spring frost and first fall frost.
What planting zone is Philadelphia, PA?
Philadelphia, PA is in USDA hardiness zone 7b.