The 1949 season saw Ulmen win nine races, including the Solituderennen and the DMV Grenzlandringrennen. He was won races at München, Nürburgring, Sachsenring and Kölner Kurs. He also recorded seven second place that season. 1950 saw the first Großer Preis von Deutschland after World War II, at the Nürburgring, where he finished fourth in his open-wheel Veritas RS. In this car, he also recorded a surprising third place in the Preis der Ostechweiz-Erlen in Switzerland, beaten only by the Scuderia Ferraris of Luigi Villoresi and Roberto Vallone. Prior to 1950, there was a ban on German cars and drivers completing in foreign events, after the war. He retained his German Champion title, he first won in 1949.