The original iterations of ACF Winter were held in January 2009 and 2010. Intended to be intermediate in difficulty between ACF Fall and ACF Regionals, both tournaments were generally regarded as regular difficulty after the fact.
The first iteration, 2009 ACF Winter, was edited by Jerry Vinokurov with Dennis Jang and Trygve Meade. The second iteration was edited by Andrew Hart, Rob Carson, Dennis Jang, Trevor Davis, and Eric Mukherjee.
In 2020, ACF announced that a revived version of ACF Winter would take place on November 21, 2020. The tournament was head-edited by William Golden and Andrew Wang. The 2021 tournament was head-edited by Tim Morrison.
List of ACF Winter tournaments
|2009||link||Jerry Vinokurov, with Dennis Jang and Trygve Meade||Packets|
|2010||link||Andrew Hart, with Rob Carson, Trevor Davis, Dennis Jang, and Eric Mukherjee||Packets|
|2020||link||William Golden, with Ganon Evans, Nick Jensen, Vishwa Shanmugam, Bryanna Shao, Chris Sims, Jaskaran Singh, Andrew Wang, and Chandler West + Andrew Wang for science oversight||Packets|
|2021||link||Tim Morrison, with Ethan Ashbrook, Vikshar Athreya, Nick Jensen, Joseph Krol, Angela Lin, Steven Liu, Benjamin McAvoy-Bickford, Eric Mukherjee, and Chris Sims||Packets|
|2022||link||Joseph Krol, with Eric Mukherjee, Justin Zhang, Henry Goff, Eve Fleisig, Athena Kern, Ani Perumalla, Hari Parameswaran, Govind Prabhakar, Ethan Ashbrook, and Nick Jensen||Packets|
|2023||link||Ethan Ashbrook, with Rachel Ezrielev, Raymond Chen, Chandler West, Amogh Kulkarni, Allan Lee, Sharath Narayan, Maxwell Ye, Michal Gerasimiuk, Guy Indorante, Jacob Egol, Eric Mukherjee, Joel Miles and Evan Knox||Packets|