Is there a minimum load amount? April 12, 2019 20:43 There is a $5 minimum when loading money on your Hop card, except at the TriMet Ticket Office at Pioneer Courthouse Square. Related articles What are the fares for each transit service? How do I load money on my card? Is there a reduced fare available for low-income riders? Why was I charged less than the full fare? How does reloading a plastic Hop card work?