How early can I purchase an Europe train ticket?

It depends on the train routes, carriers, countries, and train types. Most of European train tickets can be booked up to 60 days before train departure. Please refer to the below for how much in advance before the trip you can book for each carrier:

• Deutsche Bahn (DB/ DBAHN): 6 months
• Eurostar: 11 months
• Frecciarossa, Frecciaagento (High-speed trains in Italy): 6 months
• Italo (NTV): 4 months
• National Rail (RDG): 3 months
• Renfe-SNCF: 6 months
• TER (regional): 3 months
• TGV (high-speed) - Ouigo & INOUI: 3 months (can vary depending on the season)
• TGV France-Italy: 6 months
• TGV Lyria (France - Switzerland): 6 months
• TGV Alleo (France - Germany): 6 months
• Thalys: 4 months
• Ouigo Spain: 12 months
• SBB: 2 months