|South Dakota State Senate District 12|
| Term in office began|
| Term in office ended|
Jerstad has taught at the following schools: Osseo, Minnesota Junior High in 1966, Seattle, Washington Junior High from 1966 to 1967, Roseville, Minnesota Junior High from 1967 to 1968, Boron Junior High School, Seattle, from 1967 to 1968, and Roseville Middle School from 1968 to 1969. She then worked as a coach/assistant professor for Augustana College from 1977 to 2003. From 1979 to 2003, she was also the Senior Women's Administrator at Augustana College.
Jerstad earned his BA from Saint Olaf College in 1966. She went on to receive his MS in Health/Physical Education/Recreation from South Dakota State University in 1980. She then earned his EdD in Educational Administration from the University of South Dakota in 2004.
Prior to leaving the South Dakota State Senate, Jerstad served on the following committees:
- Education Committee, South Dakota Senate
- Health and Human Services Committee, South Dakota Senate
- Retirement Laws Committee, South Dakota Senate
- Taxation Committee, South Dakota Senate
Jerstad ran for re-election to the 12th District Seat in 2010. She ran on the Democratic ticket and was defeated by Republican challenger Mark Johnston. The general election took place on November 2, 2010.
Jerstad raised $57,619 for her campaign while Wick raised $77,355. 
|South Dakota State Senate, District 12 (2008)|
|Sandy Jerstad (D)||7,233||52.62%|
|Hal Wick (R)||6,513||47.38%|
Jerstad raised $57,619 during the 2008 election cycle.
His top contributors are listed below.
|Michael and Kelly Jerstad||$3,500|
|South Dakota Education Association||$3,000|
|Dan and Arlene Kirby||$2,000|
|Kevin and Peggy Kirby||$1,500|
|Craig and Pat Kirby||$1,500|
Jerstad is widowed and has three children.
|South Dakota Senate District 12
| Succeeded by|
Mark Johnston (R)