Date and Contest Period: The date will be announced annually by the ARRL but will generally be the third or fourth weekend in January. Begins 1900 UTC Saturday, ends 0359 UTC Monday (January 19-21, 2019).
Objective: For amateurs in the US and Canada (and their possessions) to work as many amateur stations in as many different 2 degrees x 1 degree Maidenhead grid squares as possible using authorized frequencies above 50 MHz. Stations outside the US & Canada (and their possessions) may only work stations in the US (and its possessions) and Canada.
All legal modes are permitted (while CW and SSB/Phone are most common, MSK144, FT8 and FM-Only are gaining popularity – other popular modes include PSK31, FSK441 and JT65). For Cabrillo file mode definitions, Digital modes should be represented as “DG” (for all things digital) or “PH” or “RY” can also be used as digital modes are transmitted via Phone audio.
Stations in KH0-9, KL7 & KP1-KP5, CY9 and CY0 count as W/VE stations and can be worked by DX stations for contest credit.
for more information: http://www.arrl.org/january-vhf