Keystone, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a community in Hillsborough County, Florida.
Tonight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. East northeast wind 2 to 6 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Keystone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 73°F | Partly Cloudy | 2 to 6 mph ENE | 12% |
| Saturday | 91°F | Mostly Sunny then Scattered Showers And Thunderstorms | 6 mph NE | 43% |
| Saturday Night | 73°F | Scattered Showers And Thunderstorms then Partly Cloudy | 5 mph ENE | 55% |
| Sunday | 90°F | Mostly Sunny then Showers And Thunderstorms | 5 mph NE | 79% |
| Sunday Night | 74°F | Showers And Thunderstorms then Isolated Showers And Thunderstorms | 3 mph ENE | 79% |
| Monday | 90°F | Partly Sunny then Showers And Thunderstorms | 5 mph NE | 80% |
| Monday Night | 74°F | Showers And Thunderstorms then Scattered Showers And Thunderstorms | 3 mph ENE | 80% |
| Tuesday | 90°F | Chance Showers And Thunderstorms | 5 mph SSE | 66% |
| Tuesday Night | 75°F | Chance Showers And Thunderstorms then Scattered Showers And Thunderstorms | 3 mph NE | 66% |
| Wednesday | 90°F | Chance Showers And Thunderstorms | 5 mph NE | 68% |
| Wednesday Night | 74°F | Chance Showers And Thunderstorms then Isolated Showers And Thunderstorms | 5 mph ENE | 68% |
| Thursday | 90°F | Mostly Sunny then Scattered Showers And Thunderstorms | 6 to 9 mph NE | 53% |
| Thursday Night | 74°F | Scattered Showers And Thunderstorms | 5 to 8 mph NE | 53% |
| Friday | 89°F | Scattered Showers And Thunderstorms | 10 mph NNE | 41% |
Forecast source: National Weather Service (api.weather.gov) for Keystone (28.128, -82.608). Updated through the day.
Growing snapshot for Keystone
Last spring frost
Jan 20
First fall frost
Jan 9
Growing season
354 days
Hardiness zone
9b
More local growing data for Keystone: nearby ZIP 33556 weather · frost dates · planting calendar · Florida frost dates
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Climate data from the nearest NOAA station, Tarpon Spgs Sewage Plt, Fl (9.3 mi from Keystone). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.