Grassflat, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grassflat, a community in Clearfield County, Pennsylvania.
This Afternoon
75°F
Mostly Sunny
Mostly sunny, with a high near 75. North wind around 5 mph.
7-day forecast for Grassflat
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Mostly Sunny | 5 mph N | 0% |
| Tonight | 49°F | Partly Cloudy then Patchy Fog | 5 mph NE | 1% |
| Saturday | 70°F | Patchy Fog then Partly Sunny | 5 mph E | 4% |
| Saturday Night | 58°F | Mostly Cloudy then Rain Showers | 3 to 7 mph SE | 77% |
| Sunday | 71°F | Showers And Thunderstorms | 7 mph SW | 98% |
| Sunday Night | 52°F | Showers And Thunderstorms | 6 mph N | 80% |
| Monday | 64°F | Chance Rain Showers | 7 mph NE | 28% |
| Monday Night | 49°F | Rain Showers Likely | 8 mph E | 58% |
| Tuesday | 59°F | Rain Showers Likely | 8 mph E | 66% |
| Tuesday Night | 46°F | Rain Showers Likely | 9 mph E | 60% |
| Wednesday | 56°F | Chance Rain Showers | 8 mph E | 54% |
| Wednesday Night | 46°F | Chance Showers And Thunderstorms | 8 mph E | 50% |
| Thursday | 59°F | Chance Showers And Thunderstorms | 6 mph E | 50% |
| Thursday Night | 47°F | Chance Rain Showers | 5 mph NE | 36% |
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
Nearby towns & communities
Allport
Bigler
Blain City
Brisbin
Burnside
Casanova
Chester Hill
Clearfield
Coalport
Curwensville
Drifting
DuBois
Flinton
Frenchville
Glen Hope
Glen Richey
Grampian
Hawk Run
Houtzdale
Hyde
Irvona
Karthaus
Kylertown
Lanse
Luthersburg
Madera
Mahaffey
Mineral Springs
Morrisdale
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 Sep 19, 2026.