Denison, TX Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Denison, a city in Grayson County, Texas.

This Afternoon

98°F

Sunny

Sunny. High near 98, with temperatures falling to around 95 in the afternoon. Heat index values as high as 97. South wind around 10 mph.

7-day forecast for Denison

When	Temp	Forecast	Wind	Precip
This Afternoon	98°F	Sunny	10 mph S	0%
Tonight	77°F	Mostly Clear	5 to 10 mph S	0%
Sunday	98°F	Mostly Sunny then Slight Chance Showers And Thunderstorms	10 mph SSW	23%
Sunday Night	73°F	Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms	0 to 5 mph S	56%
Monday	93°F	Chance Showers And Thunderstorms	0 to 5 mph NW	56%
Monday Night	70°F	Chance Showers And Thunderstorms then Partly Cloudy	5 to 10 mph NNE	36%
Tuesday	90°F	Mostly Sunny	10 mph NNE	11%
Tuesday Night	67°F	Partly Cloudy	5 to 10 mph NNE	6%
Wednesday	92°F	Mostly Sunny	5 to 10 mph ENE	7%
Wednesday Night	68°F	Partly Cloudy	5 mph ENE	2%
Thursday	93°F	Mostly Sunny	5 mph ESE	1%
Thursday Night	69°F	Partly Cloudy	5 mph E	2%
Friday	93°F	Partly Sunny	5 mph ESE	5%
Friday Night	71°F	Mostly Cloudy	5 mph E	4%

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

More local growing data for Denison: nearby ZIP 75020 weather · frost dates · planting calendar · Texas frost dates

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Bells Callisburg Collinsville Dorchester Gunter Howe Knollwood Lake Kiowa Pottsboro Sadler Sherman Sherwood Shores Southmayd Tioga Tom Bean Van Alstyne Whitesboro Whitewright

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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 Sep 19, 2026.