Harmonsburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harmonsburg, a community in Crawford County, Pennsylvania.
This Afternoon
72°F
Mostly Sunny
Mostly sunny, with a high near 72. North wind around 9 mph.
7-day forecast for Harmonsburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Mostly Sunny | 9 mph N | 0% |
| Tonight | 55°F | Partly Cloudy | 3 to 9 mph NE | 1% |
| Saturday | 71°F | Partly Sunny then Slight Chance Rain Showers | 6 mph SE | 17% |
| Saturday Night | 61°F | Showers And Thunderstorms | 6 mph SE | 78% |
| Sunday | 69°F | Showers And Thunderstorms | 6 to 10 mph W | 82% |
| Sunday Night | 54°F | Chance Rain Showers | 7 to 10 mph NE | 46% |
| Monday | 65°F | Mostly Cloudy | 9 to 13 mph NE | 14% |
| Monday Night | 52°F | Chance Rain Showers | 9 to 13 mph NE | 42% |
| Tuesday | 64°F | Chance Rain Showers | 14 mph E | 42% |
| Tuesday Night | 52°F | Showers And Thunderstorms Likely | 16 mph E | 56% |
| Wednesday | 61°F | Rain Showers Likely | 15 mph E | 56% |
| Wednesday Night | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph SE | 56% |
| Thursday | 64°F | Chance Rain Showers | 8 to 12 mph E | 48% |
| Thursday Night | 52°F | Chance Rain Showers | 3 to 8 mph NE | 25% |
Forecast source: National Weather Service (api.weather.gov) for Harmonsburg (41.666, -80.314). Updated through the day.
Growing snapshot for Harmonsburg
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
More local growing data for Harmonsburg: nearby ZIP 16422 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Adamsville
Atlantic
Blooming Valley
Cambridge Springs
Centerville
Cochranton
Conneaut Lake
Conneaut Lakeshore
Conneautville
Fredericksburg
Geneva
Guys Mills
Hartstown
Hydetown
Jamestown
Kerrtown
Lincolnville
Linesville
Meadville
Pymatuning Central
Pymatuning North
Pymatuning South
Riceville
Rockdale Acres
Saegertown
Spartansburg
Springboro
Townville
Venango
Woodcock
Climate data from the nearest NOAA station, Port Meadville Ap, Pa (5.7 mi from Harmonsburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.