Idina Menzel Played Elphaba and Elsa. Now She’s Going Out on a Limb.

Menzel, a fan favorite since “Rent,” is back on Broadway in “Redwood,” and this time she’s climbing conifers.

Idina Menzel was sitting on a bench in a California redwood grove, yearning for silence. It was late one autumn afternoon, and I had been trying for months to get her to meet me in a forest where we could discuss this musical she’d been working on for 15 years about a woman in a tree, and now here we were. But also, there was a wedding party walking by, and an unleashed dog that knocked over her hibiscus tea, and an aircraft buzzing overhead.

No matter. On the drive to the forest from a dance studio where Menzel had been practicing singing upside down, because yes, this musical requires her to dance and sing while scaling a giant tree, she had been thinking about what she wanted to tell me about why she was making a show that is outwardly about redwoods — it’s called “Redwood” — but also about a grieving woman’s search for sanctuary.

“I’m a little reticent to say, but I think I have a lot of noise in my own head as a person,” she told me as we settled in at Oakland’s Reinhardt Redwood Regional Park. “The idea of escaping and freeing yourself from your own pain or loneliness or confusion is very healing to me.”

In an entertainment industry where actors are lucky to have one career-defining role, Menzel already has three: Maureen, the rabble-rousing performance artist in “Rent”; Elphaba, the green-skinned who-are-you-calling-wicked witch in “Wicked”; and Elsa, the ice-conjuring queen in Disney’s animated “Frozen” films. Those characters have many strengths, but serenity is not one of them.

“I had to audition for all of those roles. I didn’t choose them — I needed a job. And yet, maybe somehow I attract them to me,” Menzel said. “They’re fierce women, but I’m not afraid of making them very fragile at times. They’re also women — especially Elphaba and Elsa — who are afraid of their power. They’re afraid that they’re too much for people, and that their power will hurt people. And I think I feel that way in my life a lot. I’m too big. Too loud.”