Winter Field Day is held the last full weekend in January. For 2025, it will be held on January 25th and 26th. The 30-hour operational period starts at 1600 UTC on Saturday (11 am EST), the 25th, and ends at 21:59 UTC on Sunday, the 26^th (4:59 pm EST). Stations may begin setting up no earlier than 1600 UTC (11 am EST) on the Friday before. However, cumulative set-up time shall not exceed 12 hours.