Guanajuato Municipal League baseball

[roberb7]

No, it's not normally year-round, but when there's a season definitely varies from one year to the next.
Here's are two things that are definite, though, for professional baseball. The Bravos de León plays in the Mexican League, and their season is Spring to early Fall. This year's season will be shorter than usual, and is scheduled to start May 20.
For January and February, your option is the Charros de Jalisco (in Guadalajara, or Zapopan if you want to get picky) of the Pacific League. I think the Pacific League is actually in playoffs in January. The Charros are a class organization, and I recommend them highly.