Denison, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Denison, a city in Grayson County, Texas.
Today
100°F
Sunny
Sunny, with a high near 100. Heat index values as high as 101. South wind 5 to 10 mph.
7-day forecast for Denison
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Sunny | 5 to 10 mph S | 1% |
| Tonight | 78°F | Mostly Clear | 5 mph S | 1% |
| Wednesday | 102°F | Sunny | 5 to 10 mph SSW | 0% |
| Wednesday Night | 79°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Thursday | 100°F | Sunny | 5 to 10 mph SSW | 3% |
| Thursday Night | 79°F | Mostly Clear | 5 mph SSE | 3% |
| Friday | 98°F | Mostly Sunny | 5 to 10 mph S | 12% |
| Friday Night | 77°F | Mostly Clear | 5 mph SSE | 11% |
| Saturday | 97°F | Sunny | 5 to 10 mph S | 7% |
| Saturday Night | 77°F | Mostly Clear | 5 mph SSE | 7% |
| Sunday | 98°F | Sunny | 5 to 10 mph S | 4% |
| Sunday Night | 77°F | Mostly Clear | 5 to 10 mph SSE | 4% |
| Monday | 98°F | Sunny | 5 to 10 mph S | 2% |
| Monday Night | 78°F | Mostly Clear | 10 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov) for Denison (33.767, -96.581). Updated through the day.
Growing snapshot for Denison
Last spring frost
Mar 14
First fall frost
Nov 19
Growing season
250 days
Hardiness zone
8a
More local growing data for Denison: nearby ZIP 75020 weather · frost dates · planting calendar · Texas frost dates
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Whitewright
Climate data from the nearest NOAA station, Sherman, Tx (5.2 mi from Denison). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.