Grantley, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Grantley, a community in York County, Pennsylvania.
Tonight
55°F
Partly Cloudy
Partly cloudy, with a low around 55. North wind 3 to 7 mph.
7-day forecast for Grantley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Partly Cloudy | 3 to 7 mph N | 0% |
| Saturday | 77°F | Mostly Sunny | 5 mph E | 3% |
| Saturday Night | 64°F | Mostly Cloudy then Chance Rain Showers | 5 to 10 mph SE | 28% |
| Sunday | 79°F | Showers And Thunderstorms | 8 to 13 mph S | 85% |
| Sunday Night | 62°F | Showers And Thunderstorms | 5 to 9 mph NW | 85% |
| Monday | 71°F | Chance Rain Showers | 9 mph NE | 40% |
| Monday Night | 57°F | Chance Rain Showers | 7 to 12 mph NE | 45% |
| Tuesday | 64°F | Rain Showers Likely | 12 mph NE | 59% |
| Tuesday Night | 52°F | Rain Showers Likely | 14 mph NE | 59% |
| Wednesday | 61°F | Chance Rain Showers | 13 mph NE | 48% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 49% |
| Thursday | 63°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 46% |
| Thursday Night | 53°F | Chance Showers And Thunderstorms | 5 to 8 mph NE | 39% |
| Friday | 68°F | Chance Rain Showers | 9 mph N | 25% |
Forecast source: National Weather Service (api.weather.gov) for Grantley (39.940, -76.731). Updated through the day.
Growing snapshot for Grantley
Last spring frost
Apr 26
First fall frost
Oct 19
Growing season
177 days
Hardiness zone
7a
More local growing data for Grantley: nearby ZIP 17401 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Cross Roads
Dallastown
Delta
Dillsburg
Dover
East Prospect
East York
Emigsville
Fawn Grove
Felton
Franklintown
Glen Rock
Goldsboro
Hallam
Hanover
Jacobus
Jefferson
Lewisberry
Loganville
Manchester
Mount Royal
Mount Wolf
New Freedom
New Market
New Salem
North York
Parkville
Pennville
Pleasureville
Queens Gate
Climate data from the nearest NOAA station, York 3 Ssw Pump Stn, Pa (3 mi from Grantley). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.