In 2003, Plumb released a solo album, Under and Over. Plumb's solo effort was produced by Barenaked Ladies frontman Ed Robertson, who also co-wrote the tracks "Satellite" and "Loved Inconsistently" with Plumb. On the album, Plumb was backed by Robertson's friends Ian LeFeuvre, Maury Lafoy and Peter von Althen, formerly of the band Starling. Plumb formed a backing band known as "The Willing" to tour promoting the record.
He released his second album, Beauty in This World, on March 22, 2007. The Willing performed on the album, and the album was credited as by Jason Plumb and The Willing.
Plumb was part of the lineup of performers on "Ships and Dip", a cruise headlined by Barenaked Ladies. The fan cruise took place on the Carnival Legend from January 15 to January 19, 2007. He also performed on the second Barenaked Ladies' cruise, "Ships and Dip III", which was held the following year on the Carnival Victory from January 27–February 1, 2008. Plumb was not on the subsequent "Ships and Dip V", but performed on "Ship and Dip 4" which sailed on the Norwegian Dawn from February 6-February 11, 2011.
Plumb's third album, again billed with The Willing, was Wide Open Music, was released in 2009. The album contained songs relating to Saskatchewan that spanned Plumb's career, including some from his time with The Waltons, including several songs that had been recorded for promotional use. Plumb and his band re-recorded most of the old songs live or in the studio for the album.
- "5 Waltons' Albums"(1992-2001)
- "Under and Over" (2003)
- Beauty In This World (2007)
- Wide Open Music (2009)
- Alive & Willing (2011)
- All Is More Than Both (2012)
- Bell, Mike (October 16, 2003). "Plumb new solo career", Jam!. Retrieved on 2009-07-21.
- Kelly, Lewis (July 4, 2007). "Plumb and The Willing search for Beauty in This World", Vue Weekly. Retrieved on 2009-07-21.
- Schneider, Jason (October 2003). "Jason Plumb: Under and Over", Exclaim!. Retrieved on 2009-07-21.
- Reed, David (June 2009). "Plumb making beautiful music", Belleville Intelligencer. Retrieved on 2009-07-21.
- Hryniuk, Margaret (March 26, 2009). "Plumb home a reflection of its owners", Regina Leader-Post. Retrieved on 2009-07-21.
- Jason Plumb official site