Frost dates for Philadelphia, PA
When the last spring frost and first fall frost usually come, and when to plant, from 30 years of NOAA weather records.
Last spring frost
March 30
typical year
Safe to plant
April 12
frost is over in 9 of 10 years
First fall frost
November 17
typical year
Growing season
232 days
frost-free, typical year
Frost watch this week
Tonight's and the next six nights' lows from the National Weather Service forecast for the station's location. Frost: 32°F or colder. Possible frost: 33–36°F, mostly in low spots on clear, still nights.
When to plant
Counted from this page's frost dates. Warm-season crops wait for the safe-to-plant date.
| Crop | Start indoors | Plant outside | Fall planting |
|---|---|---|---|
| Cool-season crops | |||
| Peas | – | Mar 2 – 16 | – |
| Spinach | – | Feb 16 – Mar 9 | Sep 22 – Oct 6 |
| Lettuce | – | Mar 2 – 23 | Sep 22 – Oct 6 |
| Radishes | – | Mar 2 – Apr 13 | Oct 6 – 20 |
| Onions | – | Mar 2 – 16 | – |
| Potatoes | – | Mar 9 – 23 | – |
| Carrots | – | Mar 9 – 30 | Aug 25 – Sep 8 |
| Beets | – | Mar 2 – 16 | Sep 8 – 22 |
| Kale | Jan 19 – Feb 2 | Mar 2 – 16 | Sep 8 – 22 |
| Broccoli | Jan 19 – Feb 2 | Mar 16 – 30 | Sep 8 – 22 |
| Cabbage | Jan 5 – 19 | Mar 2 – 16 | Sep 8 – 22 |
| Garlic | – | – | Oct 6 – 27 |
| Warm-season crops | |||
| Tomatoes | Feb 15 – Mar 1 | Apr 12 – 26 | – |
| Peppers | Feb 8 – 22 | Apr 19 – May 3 | – |
| Cucumbers | – | Apr 12 – May 3 | – |
| Zucchini | – | Apr 12 – May 10 | – |
| Pumpkins | – | Apr 12 – May 3 | – |
| Green beans | – | Apr 12 – Sep 8 | – |
| Sweet corn | – | Apr 12 – May 10 | – |
| Basil | Mar 8 – 22 | Apr 19 – 26 | – |
Onions: from sets. Green beans: until 10 weeks before the first fall frost. Garlic: harvest next summer.
The year at a glance
Start indoors Plant outside Fall planting
The chance of frost, by date
| 1 year in 10 | Half of years | 9 years in 10 | |
|---|---|---|---|
| Spring frost after | April 12 | March 30 | March 15 |
| Fall frost before | November 4 | November 17 | December 4 |
Frost here means 32°F or colder. Read across: in 1 year in 10, spring frost carries on past the first date, which is why that date is the safe-to-plant date.
Hard freeze (28°F)
A hard freeze kills most garden plants, even hardy ones. The last one in spring usually comes around March 17 (March 31 in a late year), and the first one in fall around November 29.
Towns that use these dates
This is the nearest NOAA station with frost records for 8 towns.
Philadelphia, Camden, NJ, Gloucester City, NJ, Mount Ephraim, NJ, Narberth, Woodlynne, NJ, East Lansdowne, Millbourne
Where these dates come from
NOAA weather station PHILA FRANKLIN INST, PA US (USC00366886), 1991–2020 climate normals. It's the nearest station for 46 zip codes, all within 8 miles:
08030, 08059, 08102, 08103, 08104, 19003, 19004, 19050, 19066, 19072, 19082, 19083, 19096, 19102, 19103, 19104, 19106, 19107, 19108, 19109, 19119, 19120, 19121, 19122, 19123, 19125, 19127, 19128, 19129, 19130, 19131, 19132, 19133, 19134, 19138, 19139, 19140, 19141, 19143, 19144, 19145, 19146, 19147, 19148, 19150, 19151
Planting dates follow common university extension advice; your local extension service can fine-tune them for your soil and microclimate.