Allen, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Allen, a city in Collin County, Texas.
This Afternoon
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 102. South southeast wind 5 to 10 mph.
7-day forecast for Allen
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Sunny | 5 to 10 mph SSE | 0% |
| Tonight | 76°F | Clear | 5 to 10 mph SSE | 0% |
| Saturday | 99°F | Sunny | 5 to 10 mph S | 0% |
| Saturday Night | 76°F | Mostly Clear | 10 mph S | 0% |
| Sunday | 99°F | Mostly Sunny | 10 mph S | 9% |
| Sunday Night | 75°F | Chance Showers And Thunderstorms | 5 mph S | 47% |
| Monday | 94°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph SW | 47% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph ENE | 18% |
| Tuesday | 93°F | Mostly Sunny | 10 mph NNE | 13% |
| Tuesday Night | 70°F | Partly Cloudy | 5 to 10 mph NE | 5% |
| Wednesday | 93°F | Mostly Sunny | 10 mph ENE | 8% |
| Wednesday Night | 71°F | Partly Cloudy | 5 to 10 mph ENE | 3% |
| Thursday | 93°F | Mostly Sunny | 5 to 10 mph E | 5% |
| Thursday Night | 71°F | Partly Cloudy | 5 to 10 mph E | 5% |
Forecast source: National Weather Service (api.weather.gov) for Allen (33.110, -96.673). Updated through the day.
Growing snapshot for Allen
Last spring frost
Mar 18
First fall frost
Nov 11
Growing season
239 days
Hardiness zone
8b
More local growing data for Allen: nearby ZIP 75013 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, Mckinney Muni Ap, Tx (7.5 mi from Allen). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.