The North Dakota Game and Fish Department’s 2024 bighorn sheep survey, completed by recounting lambs in March, revealed a minimum of 350 bighorn sheep in the grasslands of western North Dakota, down 4% from 2023 and 6% above the five-year average. Despite a slight decrease from the record count in 2023, the 2024 survey was still the second highest count on record.
Altogether, biologists counted 105 rams, 199 ewes and 46 lambs. Not included are approximately 40 bighorn sheep in the North Unit of Theodore Roosevelt National Park and bighorns introduced to the Fort Berthold Indian Reservation in 2020.
Big game biologist Brett Wiedmann was pleased to see the population remain near record levels for the seventh consecutive year.
The northern badlands population declined by 4% from 2023 but was the second highest count on record. The southern badlands population increased slightly but remained near its lowest level since bighorns were reintroduced there in 1966.
“We were encouraged to see adult rams and adult ewes near record numbers,” Wiedmann said. “The streak of four consecutive record counts was broken due to below-average lamb recruitment in 2024, as lambs recruited into the population declined 21% compared to 2023.”
Weidmann said the decline in lamb recruitment was likely not related to disease, but a combination of drought, predation and ewes recovering after several years of high lamb recruitment.
“Our state’s females have invested a lot of energy in rearing lambs the last four years, so sometimes they just need to take a break and concentrate on improving body condition,” he said.
Department biologists count and classify all bighorn sheep in late summer, and then recount lambs the following March, as they approach one year of age, to determine recruitment.
Currently, about 480 bighorns make up the populations managed by the North Dakota Game and Fish Department, National Park Service and the Three Affiliated Tribes Fish and Wildlife Division, just shy of the benchmark of 500 bighorns in the state.
A bighorn sheep hunting season is tentatively scheduled for 2025. The status of the season will be determined Sept. 1, following the summer population survey.
Game and Fish issued seven licenses in 2024 and all hunters were successful in harvesting a ram.
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