Mount Gretna, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Gretna, a borough in Lebanon County, Pennsylvania.
This Afternoon
81°F
Mostly Sunny
Mostly sunny, with a high near 81. North wind around 10 mph.
7-day forecast for Mount Gretna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 81°F | Mostly Sunny | 10 mph N | 0% |
| Tonight | 54°F | Partly Cloudy | 6 to 10 mph N | 0% |
| Saturday | 75°F | Mostly Sunny | 7 mph E | 2% |
| Saturday Night | 62°F | Mostly Cloudy then Chance Rain Showers | 6 to 13 mph SE | 31% |
| Sunday | 75°F | Showers And Thunderstorms | 8 to 13 mph S | 93% |
| Sunday Night | 61°F | Showers And Thunderstorms | 8 to 12 mph NW | 93% |
| Monday | 70°F | Chance Rain Showers | 12 mph NE | 36% |
| Monday Night | 56°F | Chance Rain Showers | 10 to 16 mph NE | 39% |
| Tuesday | 62°F | Chance Rain Showers | 16 mph NE | 50% |
| Tuesday Night | 51°F | Chance Rain Showers | 18 mph NE | 50% |
| Wednesday | 61°F | Chance Rain Showers | 14 to 18 mph NE | 44% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 14 to 17 mph NE | 45% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 12 to 16 mph NE | 44% |
| Thursday Night | 52°F | Chance Showers And Thunderstorms | 12 mph NE | 38% |
Forecast source: National Weather Service (api.weather.gov) for Mount Gretna (40.246, -76.471). Updated through the day.
Growing snapshot for Mount Gretna
Last spring frost
Apr 20
First fall frost
Oct 25
Growing season
185 days
Hardiness zone
7a
More local growing data for Mount Gretna: nearby ZIP 17064 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Annville
Avon
Campbelltown
Cleona
Cornwall
Fort Indiantown Gap
Fredericksburg
Hebron
Jonestown
Lebanon
Lebanon South
Mount Gretna Heights
Myerstown
Palmyra
Pleasant Hill
Quentin
Sand Hill
Schaefferstown
Timber Hills
West Myerstown
Climate data from the nearest NOAA station, Lebanon 2 W, Pa (6.3 mi from Mount Gretna). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.