Born at Brighton, Jarnot studied voice at the Guildhall School of Music and Drama, London, with Rudolf Piernay, and was awarded the school's Gold Medal. He also took masterclasses at London's Wigmore Hall and at Stuttgart with Helmuth Rilling.
The singer came to international attention in 2000, when he won the First Prize at the ARD International Music Competition in Munich. Since then he has been invited to sing at the Konzerthaus Berlin, the Palais des Beaux Arts, Brussels, the Benaroya Hall, Seattle, the Wigmore Hall, London, the Festspielhaus Baden-Baden, the Concertgebouw, Amsterdam, and many other major venues. He has appeared at dozens of festivals, such as the Schwetzinger Festspiele and the Savonlinna Opera Festival.
Jarnot has worked with most important conductors, including Ralf Gothoni, Enoch zu Guttenberg, Jesús López-Cobos, Jonathan Nott, Andrew Parrott, Karl Anton Rickenbacher, Ulf Schirmer, Peter Schreier, Pinchas Steinberg, Martin Turnovský, Marcello Viotti, Bruno Weil, and David Willcocks.
In his main career, Jarnot has sung Aeneas in Dido and Aeneas in a London production, Onegin in Eugene Onegin in Baden-Baden, Yeletzky in Tchaikovsky's The Queen of Spades in Glasgow, Harlequin in Ariadne auf Naxos, Amfortas in Parsifal at Monte Carlo, Guglielmo in Cosi Fan Tutte at Savonlinna, Pelléas in Pelléas et Mélisande at Innsbruck, the Narrator in Gerhard Konzelmann's Die Legende von der schönen Lau at Blaubeuren, and Madhavia in Schubert's Sakontala at Urach. In 2006, he appeared as Leporello in Mozart's Don Giovanni, with Thomas Hengelbrock conducting the Balthasar Neumann ensembles at the Feldkirch Festival.
In 2005, Jarnot recorded Lieder of Richard Strauss, including piano arrangements of his Four Last Songs, typically sung by sopranos, with accompanist Helmut Deutsch. In 2011, he performed the Liebesliederwalzer of Brahms and Spanische Liebeslieder op. 138 of Schumann with Ruth Ziesak, Anke Vondung and Werner Güra at Schloss Johannisberg for the Rheingau Musik Festival.
Jarnot was the Vox Christi in recordings of Bach's Passions:
- J.S. Bach: Matthäus-Passion, Martin Lutz, Schiersteiner Kantorei, Barockorchester La Corona, Christoph Prégardien, (Evangelist and arias), Konrad Jarnot, Trine Wilsberg Lund, Yosemeh Adjei, Markus Flaig, Schiersteiner Kantorei Wiesbaden, 2006
- J.S. Bach: Johannes-Passion BWV 245 BWV 245, Philippe Herreweghe, Collegium Vocale Gent, Christoph Prégardien (Evangelist), Konrad Jarnot, Camilla Tilling, Ingeborg Danz, Jan Kobow, Peter Kooy 2007
- J.S. Bach: Der Streit zwischen Phoebus und Pan - The Contest between Phoebus and Pan, BWV 201, Hansjörg Albrecht, Münchener Bach-Chor, Bach-Collegium München, Simone Nold (Momus), Annette Markert (Mercurius), Markus Schäfer (Tmolus), Werner Güra (Midas), Konrad Jarnot (Phoebus), Stephan Genz (Pan), Ohems Classics 2007
- Edward Elgar, Complete Songs for Voice and Piano, Volume 1, Konrad Jarnot (baritone), Reinild Mees (piano), Channel Classics Records CCS SA 27507
- Konrad Jarnot - Opernsänger at konradjarnot.com (German), accessed 30 September 2011
- Konrad Jarnot (Baritone) at bach-cantatas.com, accessed 30 September 2011
- The Gold Medal at gsmd.ac.uk, accessed 30 September 2011
- Winners at ferrierawards.org.uk, accessed 30 September 2011
- Konrad Jarnot / Professor Gesang Robert Schumann Hochschule (German), accessed 4 October 2011
- Richard Strauss-Blätter, Issues 51-52 (Internationale Richard-Strauss-Gesellschaft, 2004), p. 82
- The Gramophone, vol. 86 (2008), issues 1033-1038, p. 90
- Don Giovanni feldkirch.at (German), accessed 4 October 2011
- Archiv / Termine für die Jubiläumsspielzeit 2006/2007 (German), accessed 4 October 2011
- Strauss: Vier Letzte Lieder, Etc / Jarnot, Deutsch, Oehms Classics, accessed 30 September 2011
- online catalogue entry, ArkivMusic, accessed 4 October 2011
- Auf Tränen folgt Sehnen / RMF II Schumanns Vokalquartette auf Schloss Johannisberg Axel Zibulski, Wiesbadener Tagblatt 15 July 2011 (German)