Sejong National Arboretum normally opens Tuesday–Sunday 9 a.m.–6 p.m. in March–October, with last admission at 5 p.m.; in November–February the hours are 9 a.m.–5 p.m., with final entry at 4 p.m. It closes on Mondays, 1 January, Seollal and Chuseok days and for maintenance, with a following-day closure when Monday is a holiday. Special evening opening hours in October may differ.
Standard tickets are sold online and through the visitor-centre ticket counter or kiosks. Listed individual fares are KRW 5,000 for adults aged 19+, KRW 4,000 for ages 13–18 and KRW 3,000 for ages 7–12. For groups of twenty or more, the prices are KRW 4,000, 3,000 and 2,000. Tickets allow re-entry on the same date but are not valid the next day.
A free group leader may be allowed for each ten visitors only under the specified paid education, tour company or school trip rules. Those eligible for discounts or complimentary entry must show documentary proof at a staffed counter. Pets are not allowed except legally recognized assistance dogs. Food items, bicycles, scooters, drones and some other equipment are also restricted.