Pronghorns are most active early and late in the day, so your best chance of stalking a stationary herd is at midday. But they are territorial, so even if you spook a buck, you’ll probably find him again in the same general area. I’ve stalked and scared the same antelope up to a half-dozen times in a single afternoon. Most often, they run a ways, stand and gawk, and then quickly settle down. So keep trying. If you’re up to it, you can pack a lot of hunting into a single day.