Senator Montinola was born in Bago, Negros Occidental on March 18, 1869 to Juan Montinola and Martina Benedicto.
He studied in San Juan de Letran College and Sto. Tomas University where he graduated with the degree of Bachelor of Laws in 1894.
He served in the Philippine revolution against Spain, from 1897 to 1900.
Senator Montinola entered politics when he was appointed as the first Provincial Fiscal of Iloilo and later Governor of Iloilo for two terms in 1910 and 1922.
He was elected Senator from the seventh senatorial district from 1931to 1935. He ran for assemblyman and won for two consecutive terms from 1935 to 1938 and 1935 to 1938. He was a member of the Osrox Mission that bought home the Hare-Hawes Cutting Act. Senator Montinola was a delegate to the Constitutional Convention from the second district of Iloilo in 1934 and was elected first Vice- President of the convention.
He married Miss Basa Benedicto with whom he had six children.