1. On April 7, 1915, the largest earthquake ever recorded in Idaho occurred, with a magnitude of 6.5 on the Richter scale. The quake caused significant damage in the town of Challis, including several buildings being destroyed and a local mining camp being entirely wiped out. Despite the severity of the earthquake, there were no fatalities reported.

2. In 1937, Idaho's first state liquor store opened its doors on April 7. This marked the end of Prohibition in the state, which had been in effect since 1916. The first store was located in Boise, and over time, a number of additional state-run liquor stores would open throughout Idaho.

3. On April 7, 1865, the Idaho Territorial Legislature created the county of Ada, which would go on to become one of the most populous counties in the state. The county was named after Ada Riggs, the daughter of H.C. Riggs, who was the chairman of the territorial legislature at the time.

4. Idaho's first modern ski resort, Sun Valley, opened to the public on April 7, 1936. Located in the central part of the state, Sun Valley quickly became a popular destination for skiing enthusiasts from all over the world. The resort has hosted a number of major skiing events, including the 2018 US Alpine Championships.

5. April 7, 1870, marked the day that the first telegraph line was completed in Idaho. The line ran from Corinne, Utah, to Virginia City, Montana, and passed through several towns and mining camps in Idaho along the way. The telegraph greatly facilitated communication in the region, enabling news and important messages to be sent much more quickly than before.