https://www.nps.gov/zion/planyourvis...-Workshops.pdf

On Section 2
"The use of tripods on trails is prohibited by permittees or clients (monopods are authorized)."

On Section 8
"Since nighttime photography requires the use of tripods and tripods are not authorized on park trails, nighttime photography is not authorized on park trails."

https://fstoppers.com/originals/no-t...rkshops-212558