Zilker Botanical Garden invites visitors to enjoy its beautiful grounds without admission fees on designated Free Days throughout the year. The first Free Day of 2025 is January 20, from 9:00 a.m. to 5:00 p.m., with final entry at 4:30 p.m. Parking is complimentary, with spaces available in the main lot and overflow parking at 2300 Stratford Drive, accessible via the Hartman Gate. No advance registration is needed.