Becoming a high school biology teacher typically takes four to five years after high school, combining a bachelor’s degree in biology or biology education with a state teaching license. There are also faster alternative routes for people who already hold a biology degree. Here’s what each step looks like in practice.
Choose the Right Bachelor’s Degree
You have two main options for your undergraduate path. The most streamlined is a bachelor’s degree in secondary education with a concentration in biological sciences. Programs like this bundle your biology coursework, education theory, and classroom experience into a single degree, so you graduate ready to apply for certification immediately. Arizona State University’s program, for example, leads directly to an institutional recommendation for teacher certification in grades 6 through 12.
The second option is a straight biology degree (B.S. in Biology, Molecular Biology, Ecology, etc.) without the education component. This gives you deeper scientific training and keeps other career doors open, but you’ll need to complete education coursework and certification requirements separately, either during college or afterward. If you’re already confident you want to teach, the education-focused degree saves time. If you’re less certain, a pure biology degree gives you flexibility.
Regardless of which path you choose, your program should cover the core content areas tested on certification exams: cell structure and function, genetics and evolution, diversity of life and organismal biology, ecology, and the nature of scientific inquiry and engineering. Most states require a minimum number of biology credit hours, typically 30 or more, to qualify for a secondary science endorsement.
Complete Classroom Clinical Experience
Every state requires hands-on teaching experience before you can earn your license. This starts with shorter clinical placements, often called internships or practicum hours, and builds toward a semester-long student teaching assignment. At Illinois State University, for instance, teacher candidates must log at least 100 clinical experience hours plus 50 additional hours in a diverse school setting before they begin student teaching.
Student teaching is the capstone. You’ll spend a full semester in a high school biology classroom working alongside a certified mentor teacher, gradually taking over lesson planning, instruction, and grading. This is where theory meets reality: managing 30 teenagers during a lab on cellular respiration, differentiating instruction for students at very different reading levels, and learning to think on your feet when a lesson falls flat. Most candidates describe it as the hardest and most valuable part of their training.
Pass Your Certification Exams
To earn a teaching license, you’ll need passing scores on at least two types of exams. The first tests your professional teaching knowledge, covering topics like classroom management, lesson design, and assessment strategies. The second tests your biology content knowledge. Many states use the Praxis Biology exam (test code 5236), which covers five broad domains: the nature and impact of science and engineering, cell biology, genetics and evolution, diversity of life and organismal biology, and ecology. Some states, like Arizona, use their own assessments instead.
Passing score thresholds vary by state, so check your state’s department of education website for the specific cutoff. If you completed a strong biology program, the content exam is manageable with a few weeks of focused review. Study guides and practice tests are available directly from ETS, the company that administers Praxis exams.
Alternative Routes for Career Changers
If you already have a bachelor’s degree in biology or a related science, you don’t need to go back and earn a second undergraduate degree. Alternative certification programs let you start teaching while completing your education coursework, often in the evenings or online. These programs typically take one to two years.
Some lead to a master’s degree along the way. The University of West Alabama, for example, offers an online alternative certification in biology that results in either a Master of Education or a Master of Arts in Teaching. Programs like Teach for America place you in a classroom after an intensive summer training institute, with certification coursework running concurrently during your first two years of teaching. Several states also run their own residency programs that pair you with a mentor teacher for a full year while you earn your credential.
The National Science Foundation funds scholarship programs specifically designed to recruit STEM professionals into K-12 teaching. UWA’s Project INSPIRE is one example. These can offset tuition costs significantly if you qualify.
Transferring Your License to Another State
Teaching licenses are issued by individual states, but most states participate in the NASDTEC Interstate Agreement, which makes it easier to move your credential across state lines. Under this agreement, a state will generally issue some form of authorization allowing you to teach if you hold a valid license from another participating state.
This is not automatic full reciprocity, though. The receiving state may give you a temporary or provisional license and require you to meet additional conditions within a set timeframe. Those conditions could include extra coursework, passing that state’s specific exams, or completing additional classroom hours. Before relocating, contact the new state’s department of education to find out exactly what they’ll require. Planning ahead can save you months of paperwork.
Salary and Job Outlook
The median annual wage for high school teachers was $64,580 in May 2024, according to the Bureau of Labor Statistics. Teachers in local public school districts earned a median of $66,930, while those in private schools earned around $60,130. Salaries vary dramatically by state and district. Biology teachers are often eligible for the same pay scales as other secondary teachers, though some districts offer stipends for hard-to-fill STEM positions.
Earning a master’s degree triggers a salary bump in nearly every public school district. An analysis by the Brookings Institution found that 96 percent of 112 major U.S. school districts pay teachers with a master’s degree more than those with only a bachelor’s. The average difference is about $3,205 in your first year, $4,176 by year five, and $8,411 at the top of the salary schedule. In three Maryland districts, that gap exceeds $30,000.
The financial math is worth running carefully, though. In the typical district, it takes about nine years of the pay bump just to recoup your tuition costs. In the most favorable districts, you break even in three years. In the least favorable, you might hand over nearly half of your cumulative raise to tuition over a 20-year career. If your district offers generous pay bumps and you can find an affordable program, a master’s degree pays for itself comfortably. If tuition is high and the bump is modest, the return is less clear.
What the Day-to-Day Looks Like
High school biology teachers typically teach four to six class periods per day, with one or two periods reserved for planning. You’ll develop lesson plans, set up and supervise lab activities, grade assignments, and communicate with parents. Most schools expect you to teach a mix of introductory biology and at least one elective or advanced course, such as AP Biology, anatomy and physiology, or environmental science. Having a strong foundation across all the major biology domains makes you more versatile and more valuable to a school.
Beyond the classroom, you may be asked to sponsor a science club, coach an academic team, or supervise after-school tutoring. Many biology teachers also serve as the go-to person for science fair advising. The workload extends well beyond the school day, particularly during your first few years as you build your curriculum from scratch. Most teachers report that the initial years are the toughest, with the job becoming more manageable as your lesson library and classroom management skills mature.