Hill was born and raised near Eagle Lake, Minnesota, the younger of two children and the only son of Walter Edgar and Eliza Priscilla Hill. He was raised on a farm and attended Maplewood Academy from 1916 to 1920. His earliest ambition was to be a writer, and in his last two years at MWA he was editor of a newsletter about the academy that was printed in the Union College publication The Educational Messenger.

Following graduation from academy, he enrolled at Union College, where he met Lenore Mabel Brewer, who had graduated from Oak Park Academy in Iowa in 1919. They were engaged at the end of his junior year and married in August 1924, both having graduated from UC with A.B. degrees earlier that year.

They were hired to teach at Oak Grove School near Springfield, Missouri, he to serve as principal and teacher in the upper grades and she to teach in the lower grades. Two years later, they moved to Wichita, Kansas, where he was again principal and they both taught in the upper grades in its "Intermediate Church School" for three years. In his last two years there, Milo also started and conducted a small orchestra.

The Hills taught at Campion Academy from 1931 to1937, where he also served as principal. In 1937, they accepted positions at Southern Junior College, later Southern Missionary College and Southern Adventist University, in Tennessee, where he taught in the music department for one year.

He completed an M.Mus. at Northwestern University in 1938 and then taught at Union College for the next two years. From 1941 to 1945, he taught music at Laurelwood Academy in Oregon and then at Pacific Union College for the following two years.

In 1947, the Hills moved to Minnesota to teach at Milo's alma mater, Maplewood Academy, for the next eight years. They then taught at Battle Creek Academy in Michigan for two years, where he directed the orchestra and choir. He served as acting head of the Division of Fine Arts at Southern Missionary College in the 1957-1958 school year.

For the next two years the Hills taught in the church school at Grand Junction, Colorado. They accepted positions at Platte Valley Academy in Nebraska in 1960, where he was honored in 1963 for his 35 years of teaching. They completed their careers at PVA, he as music teacher in the 1960s and she as English teacher in the following decade.

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