Mount Gretna, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mount Gretna, a borough in Lebanon County, Pennsylvania.
Today
74°F
Mostly Sunny
Mostly sunny, with a high near 74. South wind 3 to 13 mph.
7-day forecast for Mount Gretna
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Sunny | 3 to 13 mph S | 1% |
| Tonight | 59°F | Mostly Cloudy then Chance Light Rain | 12 mph S | 38% |
| Thursday | 72°F | Light Rain | 8 to 13 mph S | 86% |
| Thursday Night | 58°F | Light Rain Likely | 2 to 8 mph W | 61% |
| Friday | 68°F | Chance Light Rain | 3 mph NW | 41% |
| Friday Night | 49°F | Chance Light Rain then Partly Cloudy | 3 to 7 mph NW | 26% |
| Saturday | 60°F | Mostly Sunny | 7 to 14 mph NW | 12% |
| Saturday Night | 43°F | Partly Cloudy | 14 mph W | 11% |
| Sunday | 58°F | Mostly Sunny | 13 mph NW | 5% |
| Sunday Night | 40°F | Mostly Clear | 12 mph W | 4% |
| Monday | 57°F | Sunny | 10 to 16 mph W | 5% |
| Monday Night | 39°F | Mostly Clear | 7 to 13 mph W | 3% |
| Tuesday | 62°F | Sunny | 7 to 14 mph W | 3% |
| Tuesday Night | 40°F | Mostly Clear | 8 to 12 mph W | 0% |
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 Nov 4, 2026.