Mount Gretna Heights, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Gretna Heights, a community in Lebanon County, Pennsylvania.
Today
74°F
Partly Sunny
Partly sunny, with a high near 74. East wind around 7 mph.
7-day forecast for Mount Gretna Heights
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Partly Sunny | 7 mph E | 2% |
| Tonight | 60°F | Mostly Cloudy then Rain Showers Likely | 7 to 13 mph SE | 73% |
| Sunday | 73°F | Rain Showers | 8 to 13 mph S | 92% |
| Sunday Night | 56°F | Showers And Thunderstorms | 7 to 13 mph NW | 92% |
| Monday | 68°F | Slight Chance Rain Showers | 9 to 13 mph NE | 16% |
| Monday Night | 50°F | Chance Rain Showers | 8 to 14 mph NE | 40% |
| Tuesday | 60°F | Chance Rain Showers | 14 mph E | 45% |
| Tuesday Night | 49°F | Chance Rain Showers | 14 to 18 mph NE | 42% |
| Wednesday | 61°F | Chance Rain Showers | 17 mph NE | 40% |
| Wednesday Night | 49°F | Chance Rain Showers | 18 mph NE | 34% |
| Thursday | 62°F | Chance Rain Showers | 13 to 17 mph NE | 36% |
| Thursday Night | 49°F | Chance Rain Showers | 10 to 14 mph NE | 32% |
| Friday | 66°F | Slight Chance Rain Showers | 14 mph N | 22% |
| Friday Night | 49°F | Slight Chance Rain Showers | 10 to 14 mph N | 22% |
Forecast source: National Weather Service (api.weather.gov) for Mount Gretna Heights (40.250, -76.466). Updated through the day.
Growing snapshot for Mount Gretna Heights
Last spring frost
Apr 20
First fall frost
Oct 25
Growing season
185 days
Hardiness zone
7a
More local growing data for Mount Gretna Heights: 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
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 Heights). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.