Does anyone know what time the garage usually fills up. I have to start commuting to DC, but with a late start and don't want to have to walk from the Whole Foods parking lot.

In late 2014, I saw a County presentation that said the Wiehle garage is at roughly 79% of capacity. A lot of people bike and take buses and many use the free VDOT parking lot across Sunset Hills Road. I don't think there have been issues with the garage filling up.

That's cheerful news - thanks.