If there’s one myth that hangs around ranch country year after year, it’s the idea that a hard freeze wipes the slate clean on parasites. I get where it comes from—we see bermudagrass die back, flies disappear, snakes vanish, bugs go quiet, and everything suddenly feels…dead. But parasitology doesn’t follow the same rules as the rest of the ranch. A cold snap doesn’t magically “sterilize” your cattle or your pastures. In fact, for several parasites, winter is not a problem at all—it’s their favorite time of year.
December and January, especially across West Texas and the southern Plains, create a sweet spot for some of the most costly freeloaders on your cattle. Lice explode. Winter ticks find their groove. Internal parasites hunker down and wait for spring. And every one of these reduces performance long before you see obvious symptoms.
So let’s clarify what actually happens on your ranch in December and why waiting until spring can be too late to control parasites. Recognizing that winter doesn’t kill all parasites is key to implementing timely management steps that protect your herd’s health and future performance.
