The Lutheran Church of Hope in Broomfield, CO offers drive-through Imposition of Ashes every year on Ash Wednesday and it always cracks me up. Their address is 1305 W 10th Ave and it’s offered from 6:30 a.m. to 7:30 a.m. and again at 4:30 p.m. to 6 p.m.
(And yes, they also offer the traditional Ash Wednesday services indoors.)
I tried to find other churches in Denver who offer the service but no luck so far. There is a site called ashestogo.org however where you can find drive-through ashes in other states and countries.