| Biographical details | |
|---|---|
| Born | April 26, 1907 Sheyenne, North Dakota, U.S. |
| Died | February 17, 1989 (aged 81) Fort Garland, Colorado, U.S. |
| Playing career | |
| Football | |
| 1924–1927 | Luther |
| Coaching career (HC unless noted) | |
| Football | |
| 1935–1937 | Bemidji State |
| Basketball | |
| 1935–1942 | Bemidji State |
| 1946–1947 | Bemidji State |
| 1947–1954 | South Dakota State |
| Baseball | |
| 1948–1949 | South Dakota State |
| Administrative career (AD unless noted) | |
| 1947–1960 | South Dakota State |
| Head coaching record | |
| Overall | 7–14–1 (football) 166–134 (basketball) 8–14 (baseball) |
Reuben Bernhard "Jack" Frost (April 26, 1907 – February 17, 1989) was an American football, basketball, and baseball coach and college athletics administrator. He served as the head football coach at Bemidji State University in Bemidji, Minnesota from 1935 to 1937, compiling a record of 7–14–1.[1] Frost was also the head basketball coach at Bemidji State from 1935 to 1942 and in 1946–47 and at South Dakota State University from 1947 to 1954, amassing a career college basketball coaching record of 166–134.[2]