Last frost date in Pottstown, PA
The average last frost in Pottstown is April 20. By May 6 the chance of another 32°F night drops to 1 in 10. The first fall frost usually arrives about October 23, which leaves 186 frost-free days. An early freeze before October 9 happens one year in ten.
- Safe after (10% risk)
- May 6
- Average first frost
- Oct 23
- Frost-free season
- 186 days
- Hard freeze (28°F) ends
- Apr 6
Frost possible in low spots Fri night, low 33°F
National Weather Service forecast, updated Oct 22, 12:24 UTC
- ThuOct 2240°
- FriOct 2333°possible frost
- SatOct 2434°possible frost
- SunOct 2537°
- MonOct 2643°
- TueOct 2743°
- WedOct 2843°
Planting calendar for Pottstown
Windows count forward or back from the average frost dates above. Click a crop for dates across Pennsylvania.
TomatoesApr 27–May 11
PumpkinsMay 4–May 18
SunflowersApr 20–May 11
CucumbersMay 4–May 11
CornApr 27–May 11
Sweet potatoesMay 11–May 25
WatermelonMay 4–May 18
Green beansApr 27–May 18
ZucchiniApr 27–May 11
OkraMay 11–May 25
PeppersMay 4–May 18
BasilApr 27–May 11
Butternut squashApr 27–May 11
CantaloupeMay 4–May 18
EggplantMay 4–May 18
PotatoesMar 23–Apr 6
OnionsMar 9–Mar 30
CarrotsMar 30–May 4
LettuceApr 6–Apr 27
BroccoliMar 23–Apr 6
BeetsMar 23–May 4
PeasMar 9–Mar 23
CabbageMar 23–Apr 6
RadishesMar 16–Apr 27
Brussels sproutsApr 6–Apr 20
SpinachMar 9–Mar 30
CilantroApr 6–Apr 27
KaleMar 23–Apr 6
Collard greensMar 23–Apr 6
TurnipsMar 23–Apr 6
DillApr 20–May 4
CeleryApr 27–May 4
CauliflowerApr 6–Apr 20
LeeksApr 6–Apr 20
Swiss chardApr 6–May 4
ParsleyApr 6–Apr 27
Tulip bulbsOct 9–Nov 13
GarlicOct 2–Nov 6
Daffodil bulbsSep 25–Nov 6
StrawberriesMar 23–Apr 6
AsparagusMar 23–Apr 6Frost probabilities
| Threshold | Spring, 90% chance later | Spring, 50% | Spring, 10% | Fall, 10% chance earlier | Fall, 50% | Fall, 90% |
|---|---|---|---|---|---|---|
| Light frost, 32°F | Apr 5 | Apr 20 | May 6 | Oct 9 | Oct 23 | Nov 5 |
| Hard freeze, 28°F | Mar 23 | Apr 6 | Apr 21 | Oct 19 | Nov 3 | Nov 18 |
Read the spring 10% column as the date after which only one year in ten still gets frost. That is the safer date for tomatoes, peppers and basil.
Where these numbers come from
NOAA station Pottstown Limerick Airport (USW00054782) sits 4.7 miles from the center of Pottstown at 291 feet. Its averages cover 1991 to 2020. Low spots, valleys and open fields can keep getting frost a week or two after the station stops; city centers and lakeshores usually get less of it.
Questions
When is the last frost in Pottstown, PA?
The average last frost date in Pottstown is April 20, based on NOAA 1991–2020 climate normals. There is a 10% chance of frost after May 6.
When is the first frost in Pottstown?
The first frost in fall usually comes around October 23. One year in ten it arrives before October 9.
How long is the growing season in Pottstown?
About 186 days between the average last and first frost.
When should I plant tomatoes in Pottstown?
Plant tomato seedlings outside from April 27 to May 11. Start seeds indoors six to eight weeks earlier.
Nearby in Pennsylvania
- PhoenixvilleApr 18
- ReadingApr 14
- King of PrussiaApr 8
- NorristownApr 8
- AllentownApr 20
- Drexel HillApr 2
- BethlehemApr 20
- ChesterMar 30
- PhiladelphiaMar 30
- EastonApr 18
- LancasterApr 19
- LebanonApr 20