The Oct. 26 Halloween event will feature costumed characters who will pass out candy, as well as costume contests for all ages, games, pumpkin patch photos and face painting.
Proceeds will pay for improvements to the zoo.
Zoo Boise will be open from 10 a.m.-5 p.m., with last admission at 4:30 pm.
Admission is $7 for adults age 12-61, $4.25 for children age 3-11, $4.50 for seniors age 62 and older, and free for kids 2 and younger.
Friends of Zoo Boise Annual Pass holders may enter for free with pass and photo ID at a special entrance gate.
Sponsors are Delta Dental, Mix 106, Today’s Channel 6, Fox 9 and Season Sponsor, U.S. Bank.