With the new WSJT-X version 2.2.0-rc2, now available for downloading from the WSJT-X website the WSJT-X development team has also published additional FT8 “overflow” frequencies:
Increasing FT8 usage on the popular bands 40, 30, and 20m means that the default 3 kHz sub-bands are often wall-to-wall with signals. Overcrowding encourages some to turn on their amplifiers, which only makes things worse. We are trying to coordinate the suggested frequencies in WSJT-X with updated band plans being considered by IARU, ARRL, and other amateur radio societies. On a trial basis, and in response to numerous suggestions from around the world, we have added a second set of suggested dial frequencies for FT8 on three HF bands and also on 6 meters. The new suggested dial frequencies are 7.071, 10.133, 14.071, and 50.310 MHz. These frequencies will appear in your drop-down band-selector list after you go to the "Settings | Frequencies" tab, right-click on the frequency table, and select "Reset". Alternatively, you can add the new FT8 frequencies manually. When the conventional FT8 sub-band on 6, 20, 30, or 40 m seems too full, please try moving your dial frequency down 3 kHz! Be aware that as currently implemented, WSJT-X will set your dial to the lowest frequency for the selected mode and band, when you switch bands.
We’ve updated our list of FT8 Frequencies page accordingly.