This link covers most of the markets (big and small). Not just Germany, but all of Europe. It's pretty well filled out as of today, but gets updated regularly.
Christmas this year is on a Thursday. As is New Years.
Posted by
Belgium
100 posts
If you are looking for a simple breakdown by Bundesland, or according to certain themes, and with easy access to some useful details and accompanying maps, see also this link https://www.deutsche-weihnachtsmaerkte.de/weihnachtsmarkt/
Posted by
Frankfurt, Germany
9569 posts
This is my list for the area around Frankfurt, Mainz, except I included Rothenburg
Offenbach Christmast Market 17.11-29.12 (closed on 23.11, Toten Sonntag)
Darmstadt Christmas Market 17.11-23.12 (closed on 23.11 Toten Sonntag)
Rüdesheim Christmas Market of Nations 20.11-23.12 (quiet mkt on 23.11)
Rothenburg ob der Tauber 21.11-23.12 (closed on 23.11, Toten Sonntag)
Aschaffenberg Advents Market 22.11-22.12
Koblenz Christmast Market 22.11-05.01
Frankfurt Christmas Market 24.11-22.12
Heidelberg Christmas Market 24.11-22.12
Michelstadt Advents Market 24.11-23.12
Wiesbaden Sternschnuppen Market 25.11-23.12
Speyer Christmas Market 25.11-6.01
Seligenstadt Christmas Market 27.11-14.12
Mainz Christmas Market 27.11-23.12
Bad Homburg Christmas Market am Schloss - Weekends, 28-30, 5-7, 12-14, 19-21
Limburg Christmas Market 28.11-22.12
Marburg Advents Market 28.11-23.12
SMALLER, SHORTER MARKETS
Burg Ronneburg 29-30, 6-7, 13-14 Medieval Markte
Idstein Advents Market 5-7.12
Königstein Christmas Market 5-7.12
Büdingen Christmas Market 3-7.12
Gelnhausen Christmas Market 11-14.12
Eppstein Advents Market 13-14.12