Mount Gretna, PA Weather & Growing Conditions
Today
75°F
Partly Sunny
Partly sunny, with a high near 75. East wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Partly Sunny | 7 mph E | 2% |
| Tonight | 61°F | Mostly Cloudy then Rain Showers Likely | 7 to 13 mph SE | 73% |
| Sunday | 74°F | Rain Showers | 8 to 13 mph S | 92% |
| Sunday Night | 57°F | Showers And Thunderstorms | 7 to 12 mph W | 92% |
| Monday | 68°F | Slight Chance Rain Showers | 12 mph NE | 16% |
| Monday Night | 52°F | Chance Rain Showers | 8 to 14 mph NE | 40% |
| Tuesday | 60°F | Chance Rain Showers | 14 mph E | 46% |
| Tuesday Night | 49°F | Chance Rain Showers | 14 to 18 mph NE | 42% |
| Wednesday | 61°F | Chance Rain Showers | 18 mph NE | 40% |
| Wednesday Night | 50°F | Chance Rain Showers | 15 to 18 mph NE | 35% |
| Thursday | 62°F | Chance Rain Showers | 13 to 17 mph NE | 36% |
| Thursday Night | 50°F | Chance Rain Showers | 9 to 14 mph NE | 32% |
| Friday | 66°F | Slight Chance Rain Showers | 14 mph N | 23% |
| Friday Night | 50°F | Slight Chance Rain Showers | 9 to 15 mph N | 21% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Mount Gretna, PA
Last spring frost
Apr 20
First fall frost
Oct 25
Growing season
185 days
Hardiness zone
7a
Explore more for Mount Gretna, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Lebanon 2 W, Pa (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.