How do I pick up my IFR clearance at a non-towered airport?
At some airports you may be able to reach ATC on the ground using the radio frequency listed for clearance delivery or approach control. Another option is to call clearance delivery directly on your phone. You can find the phone number for the overlying Air Route Traffic Control Center (ARTCC) listed in the Chart Supplement under in the communications section under “Clearance Delivery Phone.” You can also pick up an IFR clearance after you are airborne, providing you remain VFR until you get your clearance.