The bull was first reported around 7:35 p.m. on the northbound 15 near the Base Line and Foothill exits. CHP officers ran a traffic break as efforts were made to corral the animal.
Initially the bull was grazing along the side of the road but eventually wandered onto the closed lanes of the freeway.
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CHP cruisers slowly escorted the errant animal along the freeway, boxing him in and corralling him off the main road.
By about 8:40 p.m. Caltrans reported the bull had been "safely recovered .... And fed." All lanes were reopened.
It wasn't clear where the bull had initially come from or how he had gotten loose.