US National Chemistry Olympiad (USNCO): A Complete Guide

If you’re a high school student passionate about chemistry, the U.S. National Chemistry Olympiad (USNCO) is your chance to explore advanced topics and test your skills. The USNCO is a rigorous, exam-based program where you’ll be tested on college-level topics such as physical and organic chemistry, analytical methods, and thermodynamics, with top performers advancing toward national competition and international selection.

In this guide, we’ll walk you through the essentials from how the competition works and who can participate to key preparation tips for each stage. Whether you’re aiming for the Study Camp or just want to sharpen your chemistry knowledge, this blog will help you get started on your Chemistry Olympiad journey.

• What is the US National Chemistry Olympiad (USNCO)?
• US National Chemistry Olympiad (USNCO) Awards and Prizes
• How to Qualify for the US National Chemistry Olympiad (USNCO)
• How to Get into US National Chemistry Olympiad (USNCO)
• How to Win the US National Chemistry Olympiad (USNCO)
• US National Chemistry Olympiad (USNCO) Previous Winners
• Frequently Asked Questions
• Takeaways

What is the US National Chemistry Olympiad (USNCO)?

The U.S. National Chemistry Olympiad (USNCO) is a premier chemistry competition for high school students across the United States. Sponsored by the American Chemical Society, it gives students the opportunity to show their chemistry knowledge, problem-solving skills, and passion for science on a national stage.

The US National Chemistry Olympiad (USNCO) follows a four-tier structure that steadily narrows the field of competitors:

• Tier 1  (Local Section Exams). Each spring, thousands of students begin at the local level, taking part in exams administered by ACS Local Sections across the country.
• Tier 2 (National Exam). Around 1,000 of the top performers are nominated to sit for the National Exam each April, a rigorous multi-part test covering conceptual questions, problem-solving, and lab practicals.
• Tier 3 (Study Camp). The 20 highest-scoring students are invited to an intensive two-week Study Camp, where they receive advanced instruction and training from leading educators.
• Tier 4 (International Team). From camp, four students are selected to represent the United States at the International Chemistry Olympiad, competing against peers from around the world.

The US National Chemistry Olympiad (USNCO) is a competition that’s your pathway to deeper learning, new friendships, and national recognition. If you’re aiming for the International Chemistry Olympiad or simply looking to challenge yourself, the program opens doors to exciting academic and professional opportunities in science.

US National Chemistry Olympiad (USNCO) Awards and Prizes

Each year, thousands of students compete through local and national rounds, with top performers earning distinctions, medals, and opportunities to represent the United States on the global stage.

Here are the awards and honors presented each year:

The USNCO celebrates curiosity, perseverance, and scientific excellence—and your achievement reflects a genuine love for chemistry and a commitment to discovery.

How to Qualify for the US National Chemistry Olympiad (USNCO)

Earning a spot in the U.S. National Chemistry Olympiad Finals is a multi-step journey designed to identify the nation’s top high school chemists.

Before you set your sights on the finals, here’s what you need to know about eligibility rules and other important details:

Eligibility

To participate, you must meet the following:

• General participation. The US National Chemistry Olympiad (USNCO) is open to U.S. high school students (grades 9–12) who will not graduate before May of the competition year and who are under 20 years old on July 1.
• National exam qualification. To advance beyond the Local Section Exam, students must be U.S. citizens or legal permanent residents. Each school may nominate up to two students for the National Exam through their ACS Local Section. Past Study Camp participants automatically qualify.
• International or nonresident students. Students who are not U.S. citizens or permanent residents may take the Local Exam for practice and experience but cannot progress to the National Exam or beyond.
• Restrictions. Gold medalists at the International Chemistry Olympiad cannot return in future years. Students who commit to another Olympiad training camp (such as for Math or Physics) in the same summer are ineligible for Chemistry Camp.

Required Documents

Take note of the following before you participate:

• Local section exam. No paperwork is required at this stage. Students simply register through their ACS Local Section and, if selected, take the exam in March.
• National exam nominees. Schools must submit the official Nomination Form, signed by a teacher and student, to confirm eligibility. Students may also need to provide proof of U.S. citizenship or permanent residency.
• Study camp candidates. Those invited to the two-week camp may be asked to submit additional forms, including commitments to attend and confirmation that they are not participating in another Olympiad training program that summer.
• International team members. Students chosen for the International Chemistry Olympiad must complete travel documents, consent forms (for minors), and agreements coordinated by the American Chemical Society and team mentors.

Contest Fees

There is no fee for students to participate in the Local Section Exam or, if nominated, the National Exam.

For students advancing to the Study Camp or the International Chemistry Olympiad, major expenses such as travel, housing, and meals are covered by the American Chemical Society. Families may only be responsible for minor personal costs during participation, such as optional items or personal spending money.

Registration Deadline

Each year, the U.S. National Chemistry Olympiad follows a structured path that begins with registration and local exams, then advances through national testing and an elite training camp. Below is the 2026 schedule as announced by the American Chemical Society:

The USNCO’s timeline ensures a steady progression from local competitions to international recognition, giving students the opportunity to deepen their chemistry knowledge while earning national honors.

How to Get into the US National Chemistry Olympiad (USNCO)

Getting into the U.S. National Chemistry Olympiad (USNCO) is a step-by-step process that starts at the local level and can take you all the way to the international stage. Here’s the pathway, laid out clearly so you can plan ahead and stay on track:

1. Understand the rules.

Timeline: Before registration opens

Before entering the competition, make sure to review the official eligibility requirements on the ACS website. Advancement through the competition depends on your performance at each level—beginning with a Local Section nomination, followed by results from the National Exam, and finally, your performance at the USNCO Study Camp for the country’s top chemistry students.

2. Register through your ACS Local Section.

Timeline: Check your Local Section’s deadline (typically by early spring)

There isn’t a single national registration deadline for the USNCO since each ACS Local Section sets its own schedule. Keep in mind that registering doesn’t automatically guarantee participation. Local Section coordinators review applications and select the official entrants who will take the Local Exam.

3. Compete in the Local Exam.

Timeline: March

Every March, thousands of students nationwide participate in the Local Section Exams, demonstrating their chemistry knowledge and problem-solving skills. The top scorers from each section are then nominated to advance to the National Exam, where they compete for a chance to qualify for the USNCO Study Camp.

4. Advance to the National Exam.

Timeline: April

Each year, around 1,000 students across the country take the three-part National Exam, one of the most challenging stages of the USNCO. The exam tests advanced chemistry knowledge through conceptual questions, problem-solving exercises, and hands-on laboratory practicals, extending far beyond what’s typically covered in a high school classroom.

5. Aim for Study Camp.

Timeline: June

The 20 highest-scoring students from the National Exam are invited to attend a two-week Study Camp hosted by the American Chemical Society. This experience also helps identify the students who will go on to represent the United States at the International Chemistry Olympiad (IChO).

6. Watch for international team selection.

Timeline: July

From the Study Camp, four of the highest-performing students are selected to represent the United States at the International Chemistry Olympiad (IChO). At this global event, they compete against top young chemists from over 80 countries, tackling challenging theoretical and experimental exams.

7. Familiarize yourself with the important dates.

Timeline: Year-round

Check with your ACS Local Section for specific registration deadlines, as they may vary by region. Be sure to note the key dates in the national timeline. Planning your preparation around these milestones will help you stay organized, manage your study time effectively, and perform your best at each stage of the competition.

How to Win the US National Chemistry Olympiad (USNCO)

Standing out in the U.S. National Chemistry Olympiad (USNCO) takes more than just memorizing formulas. It’s about building strong study habits, thinking like a chemist, and approaching each stage of the competition with confidence. Here are practical steps to help you prepare:

1. Strengthen your chemistry “core.”

Before tackling Olympiad-style questions, make sure you’re confident with the essentials like  stoichiometry, periodic trends, thermodynamics, kinetics, and equilibrium. These topics are the backbone of almost every exam problem. Think of them as the “grammar” of chemistry—you need them to make sense of everything else.

2. Learn to connect concepts.

USNCO problems cover a wide range of topics: a single question might weave together bonding, energy changes, and equilibrium shifts. Practice making connections across topics instead of studying each chapter in isolation. For example, relate acid–base chemistry to thermodynamics, or connect molecular structure with reaction mechanisms.

3. Get comfortable with multi-step problems.

Unlike classroom tests, Olympiad questions often require layered reasoning. Train yourself to break down a long problem into smaller parts: write out knowns, identify the principle at play, and solve step by step. Even partial progress can earn credit on the free-response sections.

4. Develop exam-time strategies.

During the National Exam, don’t get stuck on a single hard question. Skim through the test, start with what feels most manageable, and build momentum. Use the multiple-choice section to warm up, then carefully pace yourself in free-response problems. Time management is half the battle.

5. Practice clear communication.

In Chemistry Olympiad, how you explain your reasoning matters. Free-response answers should be organized, with equations, units, and logical steps clearly shown. Think of your paper as something another student should be able to follow and learn from. Neat, clear work can help you avoid mistakes too.

6. Don’t neglect lab skills.

The lab portion is unique to the US National Chemistry Olympiad (USNCO). Even if you can’t practice with full experiments, review basic techniques—measuring precisely, setting up glassware, recording data, and drawing conclusions. Watch lab videos, practice designing procedures, and always think safety first.

7. Train with past exams.

One of the most powerful ways to get ready for Chemistry Olympiad is to dive into previous year tests and use them as real practice tools. On ACS’s “Prepare for Exams” page, you’ll find annotated past exams with full solutions—especially for National Exam Parts 2 and 3.

Start with earlier Local Section Exams and work your way up to National Exam problems. When you solve them, don’t stop at your answer. Instead, review every official solution, compare alternative approaches, and annotate your own notes with where you got stuck or what new trick you learned.

Take advantage of other ACS offerings as well—such as recorded webinars, coaching programs, and their “Exam Reference Page” to supplement your practice.

Doing this helps you in three ways:

• You become familiar with question styles and difficulty.
• You learn efficient methods and shortcuts used by top scorers.
• You build confidence for when you face the real exam under time constraints.

8. Balance your prep.

Don’t cram everything in the week before. Instead, start building good study habits months in advance. Spread out your practice: a little each week on problem-solving, occasional mock exams under timed conditions, and steady review of tricky concepts. Slow, consistent training is what carries students to the top.

9. Learn from mistakes.

After every practice session, ask: What tripped me up? Was it the concept, the tricky math, or the time pressure? Keep a notebook of these lessons. Over time, you’ll spot patterns in your weaknesses and turn them into strengths.

10. Stay motivated and curious.

USNCO is tough, but it should also fuel your love for chemistry. Balance serious study with curiosity-driven learning: watch chemistry demos, read about real-world applications, or explore fun experiments at home. Enjoying the subject will keep you motivated through the challenge.

US National Chemistry Olympiad (USNCO) Previous Winners

Below are the official results for the 2025 U.S. National Chemistry Olympiad (USNCO) featuring the top 20 national finalists, Study Camp participants, and students selected to represent the United States at the International Chemistry Olympiad (IChO). These students were recognized for their exceptional performance in both theoretical and laboratory chemistry.

Frequently Asked Questions

1. Who can participate in the US National Chemistry Olympiad (USNCO)?

High school students in the United States (grades 9–12) who meet eligibility requirements can register through their ACS Local Section. While some international or nonresident students may take the Local Exam for practice, only U.S. citizens and permanent residents are eligible to advance to the National Exam, Study Camp, and the International Chemistry Olympiad team.

2. What happens if I do well in the US National Chemistry Olympiad (USNCO) exams?

Strong performance on the Local Exam can earn you a nomination to the National Exam. From there, the top 20 students nationwide are invited to the Study Camp. At camp, four students are selected to represent the United States at the International Chemistry Olympiad.

3. How are the exams structured?

The National Exam is given each April and has three parts: a multiple-choice section, a set of free-response problems, and a lab practical. Students who perform well progress to the Study Camp in June, where training is both classroom-based and experimental.

4. Is the US National Chemistry Olympiad (USNCO) a prestigious competition?

Yes, USNCO is one of the most respected high school science competitions in the country. It is the official pathway for U.S. students to qualify for the International Chemistry Olympiad. Excelling at any stage—especially Study Camp or the international team—demonstrates exceptional scientific ability and dedication, highly valued by universities and STEM programs.

5. What tier of extracurricular activity does success at US National Chemistry Olympiad (USNCO) belong to in terms of competitiveness and college admissions value?

Winning or advancing to the upper levels of USNCO is considered a Tier 1 extracurricular in the context of college admissions. It is a nationally selective, prestigious achievement that sets students apart, showing both advanced mastery in chemistry and the discipline to succeed in a highly competitive academic environment.

Takeaways

• Competing in the U.S. National Chemistry Olympiad (USNCO) shows that you can think critically, apply advanced chemistry concepts, and solve problems under pressure—skills that stand out in academics and beyond.
• The US National Chemistry Olympiad (USNCO) season begins with Local Section Exams in March, followed by the National Exam in April, Study Camp in June, and the International Chemistry Olympiad in July.
• Top students from the National Exam may be invited to the prestigious Study Camp, where the final four members of the U.S. team are selected for IChO.
• Successful participants demonstrate strong analytical thinking, practical lab skills, and perseverance through challenging material.
• A college admissions advisor can help you present your US National Chemistry Olympiad (USNCO) achievements in a way that highlights your scientific ability, problem-solving mindset, and recognition at the national level.