Transit to Trails Act This bill directs the Department of Transportation (DOT) to establish the Transit to Trails Grant Program to award grants to certain entities (e.g., states, local governments, and metropolitan planning organizations) for projects that increase transportation access and mobility to public lands, waters, parkland, monuments, or recreational opportunities for critically underserved communities. A critically underserved community is (1) a community that can demonstrate it has inadequate, insufficient, or no park space or recreation facilities; (2) a community in which at least 50% of the population is not located within 1/2 mile of park space; or (3) an environmental justice community (i.e., a community with significant representation of communities of color, low-income communities, or at-risk tribal and Indigenous communities that experiences, or is at risk of experiencing, a disproportionate burden of adverse human health or environmental effects). Among other things, DOT must (1) prioritize the approval of certain projects, such as projects that use low-or no-emission vehicles and those that provide free or discounted rates for low-income riders; (2) develop transportation planning procedures for projects conducted under the program that are consistent with metropolitan and statewide planning processes; and (3) ensure that all new transportation connectors and routes developed under the program are accessible to people with disabilities. The bill requires grant awards to be at least $25,000 and not more than $500,000. Further, the bill requires publication of all schedules and routes for transportation systems that are developed with funds from a grant under the program.