Mount Gretna, PA Weather & Growing Conditions
Today
74°F
Mostly Sunny
Mostly sunny, with a high near 74. South wind 3 to 13 mph.
7-day forecast
| 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 | 9 to 13 mph S | 37% |
| Thursday | 72°F | Light Rain | 8 to 13 mph S | 85% |
| Thursday Night | 58°F | Light Rain Likely | 2 to 8 mph SW | 61% |
| Friday | 68°F | Chance Light Rain | 3 mph NW | 43% |
| Friday Night | 49°F | Chance Light Rain then Partly Cloudy | 3 to 7 mph NW | 26% |
| Saturday | 60°F | Mostly Sunny | 8 to 14 mph NW | 12% |
| Saturday Night | 43°F | Partly Cloudy | 14 mph W | 11% |
| Sunday | 58°F | Mostly Sunny | 10 to 14 mph NW | 5% |
| Sunday Night | 41°F | Mostly Clear | 12 mph W | 4% |
| Monday | 58°F | Sunny | 12 to 16 mph W | 5% |
| Monday Night | 40°F | Mostly Clear | 6 to 12 mph W | 3% |
| Tuesday | 62°F | Sunny | 6 to 14 mph W | 3% |
| Tuesday Night | 41°F | Mostly Clear | 10 mph W | 0% |
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 Nov 4, 2026.