Building in Collin County
Collin County is in northeastern Texas, thirty miles south of the Red River. Its seat, McKinney, lies thirty-four miles northeast of Dallas. The county covers 851 square miles, and all but a small strip of its western edge falls within the Blackland Prairie region.
The surface is level to gently rolling, at 450 to 700 feet above sea level. Deep clayey soils over marl and chalk cover the central and western areas, while the east has dark loamy alluvial soils that can flood in the rainy season. July highs average 96° F and January lows 34°. Rainfall averages just under thirty-five inches, and the growing season lasts 237 days.
The county was set off from Fannin County on April 3, 1846, and named for Collin McKinney, an early settler and a signer of the Texas Declaration of Independence. McKinney replaced Buckner as county seat in 1848. Early farmers worked small family farms that grew mostly wheat and corn. The Houston and Texas Central Railway arrived in 1872, and by the mid-1890s six railroads crossed the county, starting a fifty-year stretch of farm growth.
NOAA’s Storm Events Database lists 310 hail reports in Collin County from 2016 to 2025, 265 of them an inch across or larger, with stones up to 5.25 inches. The same records show 108 damaging thunderstorm wind reports, with gusts up to about 85 mph, and 9 tornadoes. That is why a patio cover’s roof panels, fasteners and posts here are chosen for hail and wind, not only for shade.