Posted: 04/15/2015 - There will not be extended retail hours for post offices on April 15th. Here's a list of after hour drop off locations in Colorado Springs: *Taxes must be turned in by midnight. Briargate Station, 8585 Criterion Dr. Cheyenne Mountain, 1540 S. 8th St. Cimarron, 5925 E. Galley Rd. General Mail Facility, 3655 E. Fountain Blvd. Templeton Station, 4356 Montebello Dr.