Abstract: The present disclosure provides dry powder compositions of treprostinil prodrugs and methods of treating pulmonary hypertension (e.g., pulmonary arterial hypertension or PH associated with interstitial lung disease), in a patient in need thereof with the same. The dry powder composition includes (a) from about 0.5 wt % to about 5 wt % of a compound of Formula (I): a stereoisomer thereof, or a pharmaceutically acceptable salt thereof, (b) from about 10 wt % to about 61 wt % of leucine, and the balance being (c) a sugar selected from the group consisting of trehalose and mannitol. The entirety of (a), (b), and (c) is 100 wt %, and R1 is tetradecyl, pentadecyl, hexadecyl, heptadecyl, or octadecyl. The method of treating PH includes administering an effective amount of the dry powder composition to the lungs of the patient by inhalation via a dry powder inhaler, during an administration period. In certain compositions and methods provided herein, R1 is hexadecyl, e.g., linear hexadecyl.