The trail is always open.
Yes everyday
Yes. However, the person who said it's always open is wrong. The road to the trail and the trail are closed during winter. It's also closed at night. During the warmer seasons, you can visit 7 days a week.
Yes. There's an iron ranger for your parking fee. Its operated by a consecessionaire so parking is charged even if you have an america the beautiful pass. Its 10$. Fill out the envelope and place the stub on your dash. Part of the trail is closed due to a fallen 1500 yo sequoia. But otherwise the trail is open.
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