Keystone, FL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Keystone, a community in Hillsborough County, Florida.
Overnight
76°F
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms. Mostly cloudy, with a low around 76. South wind around 3 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Keystone
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 76°F | Scattered Showers And Thunderstorms | 3 mph S | 44% |
| Tuesday | 88°F | Scattered Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 to 8 mph SW | 63% |
| Tuesday Night | 76°F | Isolated Showers And Thunderstorms | 2 to 6 mph SSW | 22% |
| Wednesday | 90°F | Scattered Showers And Thunderstorms | 2 to 6 mph S | 49% |
| Wednesday Night | 75°F | Scattered Showers And Thunderstorms then Mostly Cloudy | 2 to 6 mph ESE | 47% |
| Thursday | 93°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph ENE | 73% |
| Thursday Night | 75°F | Chance Showers And Thunderstorms then Partly Cloudy | 7 mph ENE | 73% |
| Friday | 92°F | Isolated Showers And Thunderstorms | 6 to 10 mph ENE | 73% |
| Friday Night | 75°F | Chance Showers And Thunderstorms then Isolated Showers And Thunderstorms | 5 to 8 mph E | 73% |
| Saturday | 92°F | Mostly Sunny then Chance Showers And Thunderstorms | 7 mph SE | 69% |
| Saturday Night | 76°F | Chance Showers And Thunderstorms then Isolated Showers And Thunderstorms | 5 mph ESE | 69% |
| Sunday | 93°F | Mostly Sunny then Scattered Showers And Thunderstorms | 6 mph SSE | 50% |
| Sunday Night | 76°F | Scattered Showers And Thunderstorms | 3 mph ENE | 50% |
| Monday | 93°F | Mostly Sunny then Scattered Showers And Thunderstorms | 5 mph SSE | 34% |
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 Aug 4, 2026.