https://cowboystatedaily.com/2025/06/02/when-and-where-to-hear-wolves-howling-in-yellowstone/
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Crabtree said wolves are crepuscular, which means they're most active at dawn and dusk. Higher activity means a higher chance of howling.
"When they're active at dawn and dusk, there's an increase in howling," he said. "During the day, when it's warm, they're sleeping and aren't going to vocalize."
For the most part, wolves will howl just about any time they feel like it, but when they're raising and moving pups around, there's less howling," Camenzind said."
