Competing at the Texas Science and Engineering Fair (TXSEF)

The Texas Science and Engineering Fair (TXSEF) brings together middle and high school students from across Texas to showcase their scientific and engineering research. Hosted by Texas A&M University, it's the statewide fair that celebrates student creativity and problem-solving and is a direct path toward the Regeneron International Science and Engineering Fair (ISEF). This guide covers how to qualify, what the fair requires, and how to build a project that advances.

How TXSEF Works

You cannot enter TXSEF directly. Students first compete through their designated regional science and engineering fair, which determines which projects advance to the state competition. Advancement procedures and the number of available spots can vary by region, so students should review their regional fair's rules carefully rather than assuming that a particular category placement automatically qualifies them.

Texas regional fairs can also be highly competitive in their own right. If your ultimate goal is TXSEF or ISEF, treat your regional fair as a major competition and prepare for it accordingly. 

Categories at TXSEF

The fair spans a wide range of categories across the life, physical, earth, and behavioral sciences, along with engineering, biochemistry, microbiology, and more, so nearly any scientific interest has a home. 

Category selection should reflect the project's primary research question and contribution. For example, a project may use machine learning while ultimately investigating a biomedical question. Another project may involve biological concepts while primarily developing and testing an engineering device.

A useful question to ask is: “What is the central contribution of my project, and which group of judges will be best equipped to evaluate that contribution?”

The best category is generally the one where judges will most naturally understand the significance, methodology, and contribution of your research. 

Students should review the category descriptions carefully before making this decision.

Texas's Regional Science Fairs

Find your regional fair by county, then aim to advance to the state TXSEF.

Qualifying and Registering

Start at Your Regional Fair

Whether you enter as an individual or a team, you present your project to expert judges at one of Texas's regional fairs. Advancing from there is what qualifies you for the state fair.

Get SRC Approval

Before you can register for TXSEF, your project must be approved by the Scientific Review Committee (SRC). You'll complete and upload the required abstract and paperwork through the fair's registration system, then monitor your account regularly for messages from the SRC.

If corrections are requested, make them promptly and resubmit. Approval is required before you can move ahead. Note that projects involving human subjects, vertebrate animals, or hazardous materials need SRC review before you begin experimenting, so plan for that early.

Register as a Finalist

Once approved, every finalist officially registers through the fair's platform and pays the participation fee. Finalists are required to create a virtual display board and a project overview video within the registration system. High school finalists must also bring a physical display board for in-person judging, which goes through a Display & Safety inspection, so review the current board rules and guidelines carefully before you build it.

Because these platforms and forms are updated regularly, always confirm the current registration steps and requirements on the official TXSEF site.

Beyond TXSEF: Advancing to ISEF

The top projects at TXSEF earn the chance to advance to the Regeneron International Science and Engineering Fair (ISEF), the world's largest pre-college science competition. To be eligible for ISEF, you'll need to be in grades 9–12 (and under age 20 by the competition), win at this ISEF-affiliated fair, and ensure your project follows ISEF's rules and is presented in English.

Our step-by-step guide to qualifying for ISEF maps out the full path. At ScienceFair, we also provide full support for students from their initial idea all the way to the international stage.

Building a Standout Science Fair Project

A strong TXSEF project combines well-executed research with an effective presentation. A few principles that make the difference:

First of all, make sure to start early. Give yourself ample time for experimentation and refinement. Judges can tell when you’ve rushed your project.

What Judges Are Really Looking For

A sophisticated topic alone does not make a winning science fair project. As someone who has experienced science fairs as both a competitor and a judge, one of the biggest distinctions I have noticed is between students who performed research and students who genuinely understand their research.

Judges may move beyond the rehearsed presentation very quickly. They can ask why you selected a particular experimental design, why you chose one statistical method over another, what your largest source of error was, how your work compares with existing research, or whether your conclusions are fully supported by your data.

Strong competitors can engage with these questions conversationally because they understand the reasoning behind the major decisions in their project.

Preparation should therefore extend well beyond memorizing a speech. Know your methodology, data, limitations, statistics, relevant literature, and design decisions well enough to have a genuine scientific conversation about them. 

Choose an Original & Feasible Topic

Choose a topic that genuinely sparks your curiosity and hasn't been done to death, then ground it in a real scientific or engineering challenge, renewable energy, water purification, disease detection, whatever connects your work to something tangible and impactful. 

When considering topics, make sure your project is achievable with the time and resources you have. Choosing an ambitious idea that ends in an incomplete experiment won't serve you.

Browsing recent TXSEF winners can spark ideas, but carve your own path. If you're still shaping your question, our guide to crafting the perfect science fair question walks through how to find and sharpen it.

Focus on Depth, Not Just Complexity

Complexity does not automatically equal scientific quality. A project involving artificial intelligence, advanced laboratory equipment, or an impressive biomedical topic still needs a meaningful research question, rigorous methodology, appropriate analysis, and a well-supported conclusion.

A focused project with excellent experimental design and deep student understanding can be extremely competitive. Judges want to understand the scientific contribution of the work and the reasoning behind it.

From my own experience competing, judges were often particularly interested in why I made certain research and design decisions. Understanding the reasoning behind your work is just as important as being able to explain what you did. 

Prepare for a Conversation with Judges

Have a polished opening explanation of your project, while remaining prepared for each judging session to develop differently. Some judges may listen to your entire prepared presentation before asking questions. Others may become interested in a particular aspect of your research and begin asking questions within the first minute.

Practice explaining your project at several levels. You should be able to provide a quick overview, deliver your full competition presentation, and participate in a deeper technical discussion about your methodology and results.

You should also be able to explain complicated concepts in clear language while maintaining scientific accuracy. This becomes especially important when judges come from different specialties within a broad category.

Most importantly, understand your project deeply enough that you can adapt to unexpected questions. The goal is to be prepared for a scientific conversation with the judges. 

Questions Every Student Should Be Ready to Answer

Before arriving at your regional fair or TXSEF, make sure you can comfortably answer questions such as:

• What is genuinely novel about your project?

• Why does this problem matter?

• How does your work compare with existing research?

• Why did you choose this particular methodology?

• What is the strongest evidence supporting your conclusion?

• What are the major limitations of your study?

• What result surprised you the most?

• What would you change if you repeated the project?

• What did you personally contribute to the research?

• What would the next stage of this research look like?

Students should also practice follow-up questions. A judge may take your initial answer and ask you to explain the reasoning behind it in considerably greater depth. 

It Is Okay to Say You Do Not Know

Judges do not expect a student to know the answer to every possible question. If you receive a question that goes beyond what you investigated, acknowledge it clearly and think through what you do know.

For example, you might explain that a particular variable was outside the scope of your study and then discuss how you could investigate it in future work.

Being able to recognize the boundaries of your research demonstrates maturity. A thoughtful discussion of an unanswered question can also lead to one of the most interesting conversations you have with a judge. 

Maintain Clear Student Ownership

Mentorship can be incredibly valuable, particularly when students are learning unfamiliar research techniques, entering a new field, or working with specialized equipment. At the same time, students should have a clear understanding of their individual contribution to the project.

If your project was conducted with a mentor, university laboratory, research institution, or other outside support, be prepared to explain exactly what you contributed. A judge may ask which portions of the methodology you designed, what analyses you performed, what equipment or resources were provided to you, and which decisions were made independently.

My Perspective as a Former Competitor and Current Judge

Having experienced science fairs from both sides of the judging table, one of my biggest takeaways is that the strongest judging sessions often become conversations.

As a competitor, some of my most memorable interactions with judges happened when they pushed beyond my prepared material and asked me to defend why I designed an experiment a certain way, explain an unexpected result, or interpret my findings in a different context.

Now, as a judge, I appreciate this even more. Students stand out when they can think through an unexpected question, acknowledge the limitations of their work, defend their decisions with evidence, and clearly demonstrate that they understand and own the research they are presenting.

Beyond TXSEF: Advancing to ISEF

The top projects at TXSEF earn the chance to advance to the Regeneron International Science and Engineering Fair (ISEF), the world's largest pre-college science competition. To be eligible for ISEF, you'll need to be in grades 9–12 (and under age 20 by the competition), win at this ISEF-affiliated fair, and ensure your project follows ISEF's rules and is presented in English.

Final Advice From a Competitor and Judge

Start with a problem you genuinely care about and build the strongest study you realistically can around it. Give yourself enough time to iterate, understand the literature surrounding your topic, and analyze your results critically.

By competition day, your goal should be to understand your project well enough that you can comfortably discuss it beyond your prepared presentation. Know why you made your major decisions, where the limitations are, what your results actually demonstrate, and where the research could go next.

Science fair judging can be unpredictable, particularly at highly competitive fairs like TXSEF. Rigorous research, clear student ownership, thoughtful communication, and deep understanding of your work will prepare you for those conversations and help judges understand the significance of what you accomplished.

From Regional Fair to ISEF, With Expert Support

Competing at TXSEF and advancing to ISEF takes a strong, original project, rigorous research, and a confident presentation. That's exactly what ScienceFair helps you build. Every coach on our team is a past science fair winner, and alongside our Ivy League research mentors, they'll help you refine your idea, strengthen your research, and prepare for the judges' Q&A.

Ready to make your run at TXSEF? Schedule a call with our academic advisor.