Non-essential travel restrictions are in place until at least June 22. According to the Department of Homeland Security, essential travel through land ports of entry and ferry terminals includes, but is not limited to:

U.S. citizens and lawful permanent residents returning to the United States;
Individuals traveling for medical purposes (e.g., to receive medical treatment in the United States);
Individuals traveling to attend educational institutions;
Individuals traveling to work in the United States (e.g., individuals working in the farming or agriculture industry who must travel between the United States and Mexico in furtherance of such work);
Individuals traveling for emergency response and public health purposes (e.g., government officials or emergency responders entering the United States to support Federal, state, local, tribal, or territorial government efforts to respond to COVID-19 or other emergencies);
Individuals engaged in lawful cross-border trade (e.g., truck drivers supporting the movement of cargo between the United States and Mexico);
Individuals engaged in official government travel or diplomatic travel;
Members of the U.S. Armed Forces, and the spouses and children of members of the U.S. Armed Forces, returning to the United States; and
Individuals engaged in military-related travel or operations.