President Barack Obama and first lady Michelle Obama will visit West, Texas, on Thursday.
At least 14 people were killed when a fertilizer plant fire led to a massive explosion. Hundreds of people lost their homes in the blast.
Some things were starting to get back to normal on Monday. Students up to sixth grade were dropped off at West Elementary School, which was outside the immediate blast zone. Some classes were to be held in trailers behind the building.
Middle- and high-school students were bused to a nearby school district, which turned its old, vacant intermediate school building into a temporary high school. Volunteers and staff spent three days painting, cleaning and filling the classrooms with supplies.
West assistant superintendent Jan Hungate said some teachers at work Monday had not yet been home.
Parents and students said they were just hoping for things to return to normal.