There is a little on-street parking nearby, but your best bet is to park in one of the parking structures that serves the Metro Station or Old Town Pasadena.
View a Google map showing the HackAspace location and parking.
All locations are open 24/7, and the rates are:
First 90 minutes free, $2/hour, $6 daily max, $5 flat rate after 10pm
Del Mar Station Parking Structure
(2 min walk to HackAspace)
198 South Raymond Avenue.
Schoolhouse Park & Walk Structure
(7 min walk to HackAspace)
33 East Green Street.
De Lacey Park & Walk Structure
(10 min walk to HackAspace)
45 South De Lacey Avenue.