Grassflat, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grassflat, a community in Clearfield County, Pennsylvania.
Tonight
58°F
Light Rain
Rain between 10pm and 5am, then rain showers. Mostly cloudy, with a low around 58. South wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Grassflat
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Light Rain | 9 mph S | 100% |
| Thursday | 69°F | Rain Showers then Partly Sunny | 5 to 10 mph SW | 81% |
| Thursday Night | 46°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 61°F | Partly Sunny then Slight Chance Rain Showers | 2 to 6 mph W | 20% |
| Friday Night | 39°F | Slight Chance Rain Showers | 2 to 6 mph W | 20% |
| Saturday | 49°F | Chance Rain Showers | 6 to 10 mph W | 43% |
| Saturday Night | 35°F | Chance Rain Showers | 10 mph W | 43% |
| Sunday | 53°F | Partly Sunny | 13 mph W | 2% |
| Sunday Night | 34°F | Partly Cloudy | 10 mph W | 6% |
| Monday | 53°F | Mostly Sunny | 9 to 14 mph W | 11% |
| Monday Night | 34°F | Mostly Clear | 9 mph W | 6% |
| Tuesday | 59°F | Mostly Sunny | 9 to 13 mph W | 2% |
| Tuesday Night | 33°F | Partly Cloudy | 3 to 8 mph W | 2% |
| Veterans Day | 56°F | Mostly Sunny | 3 to 7 mph NW | 3% |
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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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 5, 2026.