The North Dakota Industrial Commission said production in June was 821,000 barrels of oil and 930 million cubic feet of natural gas per day, a record for monthly production in the state.
It ranked second behind Texas for hydrocarbon production.
Activity in the Three Forks and Bakken shale reserve accounted for the record high output.
A statement by Lynn Helms, director of the state Department of Mineral Resources, said permits for drilling in the state were accelerating, as operators started making preparations for winter.
But leasing activity is low, with mainly renewals in the Three Forks and Bakken areas.
Helms said uncertainty regarding federal policies on drilling was making investors in the state nervous.