Roughly two weeks before the primary rut, bucks begin making this sign much more frequently. It's often the best time to hunt a series of rubs. But be careful. As bucks expand their range, they also leave sign that can lead you astray. Be leery of isolated rubs, no matter how impressive. A buck may never return to such a spot. Instead, look for rub lines to confirm suspected travel corridors or to reveal new ones. And keep tabs on fresh rubs that tell you a given route is still active.