Is the trombone instrument with lowest frequency?

The trombone is not the instrument with lowest frequency, it is the double bass. The double bass has the lowest pitch of any stringed instrument, with a range from about 41 Hz (E1) to 1046.5 Hz (C5). The trombone has a range from about 62 Hz (B♭1) to 1088 Hz (C6). The sound produced by the trombone has a lower frequency.