Open every day, but exact opening hours depend on the season 

• April 1 – October 31: 7:00 - 22:00
• November 1 - 31 March: 7:00 - 18:00 

wikipedia: „The Castle garden (also known as: Royal Kurgarten , less often: Spa Park ) a park in Bad Reichenhall , which from 1868 gradually planned by the Munich court gardener , Carl von Effner . ^[ 1 ] The gardens of the spa with the promenade and the with diploma are listed as historic sites„