There are a few reliable signs that spring is near in Boston: Red Sox pitchers and catchers, daffodils starting to peek through the dirt in the Public Garden, and Sullivan’s — the concession stand at Castle Island in South Boston — opening for the season.

Well, that last one came early this year, as Sully’s opened on Thursday. The shop was supposed to open Saturday, but with the good weather, opened two days early. And good news, there will be half-priced hot dogs until March 3.