The sky is the limit for skilled individuals who are motivated and responsible. Construction is not a seasonal business. In colder climates, systems have been developed to enable construction work to proceed even when the temperature drops and the snow falls. And, remember, the inside of a building has to be built too. The walls have to be framed, drywalled and painted, the electricity and plumbing have to be installed and we can't forget the floors.
Contractors generally have several construction projects going at the same time.
As projects are completed, new ones are begun. Many contractors build in several states and many also build in different countries. And if you are not interested in travel, construction can still be your field. Talk to your parents, teachers and guidance counselors. Register in your school's construction program, and work hard to do well.