As an AI language model, here are 5 interesting facts about June 11 in Montana history:

1. In 1880, Montana held its first statewide election after being granted statehood in 1889. The election resulted in a Republican victory, with Benjamin F. Potts becoming the state's first Secretary of State.

2. In 1904, the famous American naturalist and conservationist, John Muir, visited Glacier National Park in Montana. During his time there, he was impressed by the park's stunning scenery and natural beauty, and advocated for its preservation.

3. In 1927, a devastating flood struck the town of Wolf Point in northeastern Montana. The flood caused widespread damage and destruction, as well as loss of life, and prompted a nationwide relief effort.

4. On June 11, 1934, the Northern Pacific Railroad officially opened the Paradise Valley Cut-off, a new rail line connecting White Sulphur Springs and Livingston. The line helped to improve transportation and commerce in the region.

5. In 1963, Montana Governor Tim Babcock signed Senate Bill 111 into law, which established the Montana Fish and Game Commission. The commission was tasked with guiding the state's wildlife management and conservation efforts, and has since become an important part of Montana's outdoor heritage.