They are at every half hour beginning at 7:00 am. Remember the temple is closed on Monday.
This isn't my regular temple but good to kniw. Great how church is IT user friendly
Caleb is right, and if you want to double check specific days (with holidays and such) you can always check the schedule for times: www.lds.org/temples/details/logan-utah-temple?lang=eng
Endowment sessions start at 7:00 a.m. and another session starts every half hour after that.
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