King of Prussia, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for King of Prussia, a community in Montgomery County, Pennsylvania.
Tonight
62°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 3am. Mostly cloudy, with a low around 62. East wind 5 to 10 mph. Chance of precipitation is 20%.
7-day forecast for King of Prussia
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph E | 16% |
| Sunday | 78°F | Rain Showers | 5 to 10 mph S | 78% |
| Sunday Night | 60°F | Showers And Thunderstorms Likely then Mostly Cloudy | 5 to 10 mph W | 74% |
| Monday | 71°F | Partly Sunny then Chance Rain Showers | 5 to 10 mph NE | 29% |
| Monday Night | 54°F | Chance Rain Showers | 5 to 10 mph NE | 32% |
| Tuesday | 66°F | Chance Rain Showers | 10 mph NE | 41% |
| Tuesday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 41% |
| Wednesday | 65°F | Slight Chance Rain Showers | 10 to 15 mph NE | 23% |
| Wednesday Night | 52°F | Chance Rain Showers | 10 to 15 mph NE | 25% |
| Thursday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Thursday Night | 51°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Friday | 67°F | Chance Rain Showers | 10 to 15 mph N | 31% |
| Friday Night | 52°F | Chance Rain Showers | 10 mph N | 31% |
| Saturday | 71°F | Chance Rain Showers | 10 mph N | 28% |
Forecast source: National Weather Service (api.weather.gov) for King of Prussia (40.096, -75.379). Updated through the day.
Growing snapshot for King of Prussia
Last spring frost
Apr 8
First fall frost
Oct 31
Growing season
203 days
Hardiness zone
7a
More local growing data for King of Prussia: nearby ZIP 19406 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Norristown, Pa (2.8 mi from King of Prussia). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.