Grassflat, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grassflat, a community in Clearfield County, Pennsylvania.
Tonight
48°F
Mostly Clear
Mostly clear, with a low around 48. Southeast wind around 2 mph.
7-day forecast for Grassflat
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Mostly Clear | 2 mph SE | 0% |
| Wednesday | 72°F | Mostly Sunny | 0 to 9 mph SE | 0% |
| Wednesday Night | 58°F | Mostly Cloudy then Rain Showers | 7 to 10 mph S | 99% |
| Thursday | 70°F | Rain Showers | 5 to 9 mph SW | 75% |
| Thursday Night | 48°F | Mostly Cloudy then Slight Chance Rain Showers | 1 to 5 mph SW | 15% |
| Friday | 65°F | Chance Rain Showers | 0 to 3 mph W | 28% |
| Friday Night | 42°F | Slight Chance Rain Showers | 2 mph NW | 20% |
| Saturday | 56°F | Chance Rain Showers | 3 to 9 mph W | 31% |
| Saturday Night | 35°F | Chance Rain Showers then Partly Cloudy | 7 mph W | 30% |
| Sunday | 54°F | Partly Sunny | 3 to 8 mph W | 13% |
| Sunday Night | 33°F | Slight Chance Rain Showers | 8 mph W | 20% |
| Monday | 54°F | Chance Rain Showers | 8 to 12 mph W | 28% |
| Monday Night | 34°F | Chance Rain Showers | 8 mph W | 28% |
| Tuesday | 57°F | Mostly Sunny | 8 to 14 mph W | 9% |
Forecast source: National Weather Service (api.weather.gov) for Grassflat (41.008, -78.109). Updated through the day.
Growing snapshot for Grassflat
Last spring frost
May 21
First fall frost
Sep 27
Growing season
130 days
Hardiness zone
6a
More local growing data for Grassflat: nearby ZIP 16839 weather · frost dates · planting calendar · Pennsylvania frost dates
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Grampian
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New Washington
Climate data from the nearest NOAA station, Clarence, Pa (9.2 mi from Grassflat). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.