The international earth science olympiad takes four American high schoolers a year. Four. Thousands of students like rocks, weather, and oceans, and almost none of them know this competition exists or how to get into it. This guide walks you through the full path, from the open exam in March to the international team, so you know what each stage tests and how to prepare for it.
What Is the International Earth Science Olympiad?
The International Earth Science Olympiad (IESO) is a yearly competition for secondary school students, run by the International Geoscience Education Organization. It started in 2007 in Daegu, South Korea, growing out of Korea's national earth science olympiad. According to the competition's Wikipedia entry, 35 countries competed in 2024. The 2026 event ran in Turin, Italy, and 2027 heads to Matsue, Japan.
Each country sends a maximum of four official competitors. That cap is what makes the U.S. team so small.
Don't confuse IESO with Science Olympiad, the team tournament with build events and 23 event slots that you might already compete in. Both test earth science, but they work completely differently:
| Feature | Science Olympiad | International Earth Science Olympiad |
|---|---|---|
| Format | Team tournament, 15 students per school | Individual exams plus mixed international teams |
| Earth science coverage | A few events (Rocks and Minerals, Dynamic Planet, Remote Sensing) | The entire competition |
| How you enter | Through your school's team | National Open Exam, then training camp |
| U.S. spots at the top level | Dozens of teams at nationals | 4 students, plus 4 alternates |
| Season | Fall through spring | Exam in March, camp in June, IESO in late summer |
If you already compete in Science Olympiad's earth science events, you have a head start. Our guide on what Science Olympiad actually is covers that side in full.
How U.S. Students Qualify Through the USESO
The USA Earth Science Organization (USESO) runs the only path onto the U.S. team. There's no application essay and no teacher nomination. You take a test, and the test decides.
The pipeline has three stages:
- National Open Exam (March). Anyone can register. Your exam has to be proctored by a teacher or administrator at your school.
- Training Camp (June). The top 40 open exam scorers are invited to a week-long residential camp, where they take theory and practical exams.
- The U.S. Team (August). Camp results pick four team members and four alternates. The four go to IESO.
The 2026 cycle's exact dates give you a feel for the calendar. Students registered by February 28, the proctor had to confirm by March 7, the exam window ran March 19 to 23, and camp invitations went out April 18. Camp ran June 13 to 21 in Tulsa, Oklahoma. Check the USESO National Open Exam page each January for the new cycle's dates, since registration usually opens near the start of the year.
What It Costs
For 2026, registration was $25, or $5 if you have financial need. If you're invited to camp, it cost $2,600, and USESO offers need-based financial aid for that too. You don't pay anything for camp unless you score high enough to be invited.
Age Rules
You had to be at least 15 by the first day of camp in 2026. Younger students could still sit the open exam. That's worth doing. Taking it once at 14, with no pressure, means you walk into the real attempt already knowing what the test feels like.
What the Earth Science Olympiad Actually Tests
IESO pulls from six areas: geology, geophysics, meteorology, oceanography, astronomy as it relates to Earth, and environmental science. The USESO open exam follows the same spread. Most high schools teach one semester of earth science, usually in 8th or 9th grade, and it covers maybe a third of this.
That gap is the real challenge. You're going to be teaching yourself most of it.
Here's roughly how the areas break down and what each one asks of you:
| Area | What You'll Need to Know |
|---|---|
| Geology | Mineral and rock identification, plate tectonics, structural geology, Earth's history |
| Geophysics | Seismic waves, Earth's interior, gravity and magnetism |
| Meteorology | Atmospheric layers, pressure systems, fronts, storms, climate |
| Oceanography | Currents, tides, ocean chemistry, coastal processes |
| Astronomy | Earth-Sun-Moon system, solar system, seasons, celestial motion |
| Environmental science | Water cycle, carbon cycle, natural hazards, human impact |
Your first pass through this list will feel like too much. So will your second. That's normal. Nobody walks into camp having mastered all six.
Inside the International Competition
Once you're on the team, the international earth science olympiad itself has two halves.
The first half is individual. You sit a theory exam, which can run up to six hours under the IESO statutes, and a practical exam built around lab or field tasks. Think identifying rock samples, reading a weather map, or interpreting a seismogram.
The second half is where IESO gets unusual. You get split into mixed teams with students from other countries. Two activities are scored this way:
- International Team Field Investigation (ITFI). Your team goes into the field together and investigates a real site, then reports on it.
- Earth Systems Project (ESP). Your team picks apart an Earth systems topic and presents findings.
You're graded as a group, with teammates you met that week who may not share your first language. It tests whether you can do science with strangers, which is what most working scientists actually do.
How Medals Work
Medals are given by percentage, not by a fixed count. Roughly 10% of competitors get gold, 20% silver, and 30% bronze. That means more than half the field medals, so a U.S. student who makes the team has a real shot.
How to Prepare for the USESO Open Exam
USESO's own preparation page is blunt: its exams are rigorous and need extensive study. Here's a sequence that works.
- Start in the fall, not in February. The exam is in March. If you start studying in fall, you get five or six months. Students who start after registering get about three weeks.
- Read the USESO syllabus first. It's a broad outline of what can be tested. Use it as a checklist and mark which areas you've never studied.
- Take one past exam cold. Before studying anything, sit a past open exam under real time limits. Your score tells you which of the six areas to hit first.
- Pick one textbook per area. USESO also links an unofficial guide written by former U.S. team members with reading suggestions. Start there instead of collecting 30 bookmarks you'll never open.
- Do the practical stuff with your hands. Get a cheap rock and mineral kit. Read real weather maps from the National Weather Service. Practical skills don't come from reading about them.
- Retake past exams every few weeks. Track your score by area. If geophysics isn't moving, that's where next month goes.
- Find a proctor early. Ask a science teacher in December. If you wait until late February, the person you need might say no, and the deadline doesn't move.
If you're also doing Science Olympiad, the Science Olympiad practice test guide covers how to use released tests well. The same habits carry straight over.
Turning Earth Science Into Your Own Research
Here's the part most olympiad students miss. Earth science is one of the easiest fields to do real, original research in as a high schooler, because the data is already public and free.
The USGS Earthquake Hazards Program lets anyone download decades of global earthquake records. NOAA publishes weather and ocean data going back over a century. You don't need a lab, a university, or permission to use any of it.
This is a position we hold firmly: lab access is not a prerequisite for serious research, and anyone who tells you otherwise is wrong. A significant number of ISEF projects in 2025 were done without lab access. A question about aftershock patterns or urban heat islands, answered with public data, is a real project.
An olympiad tests what you know. A research project shows what you can figure out that nobody knew before. Colleges notice the difference. If you want to see what a project like that looks like from day one, read our guide on how to start a research project in high school.
Frequently Asked Questions
What is the International Earth Science Olympiad?
The International Earth Science Olympiad (IESO) is a yearly competition for secondary school students run by the International Geoscience Education Organization. Each country sends up to four students, who take individual theory and practical exams and then work on mixed international teams for field and project activities.
How do you qualify for the International Earth Science Olympiad in the U.S.?
U.S. students qualify through the USA Earth Science Organization (USESO). You take the National Open Exam in March, the top 40 scorers are invited to a week-long training camp in June, and the camp's exams pick four team members and four alternates.
How much does the USESO open exam cost?
For the 2026 cycle, registration was $25, or $5 for students with financial need. The training camp cost $2,600 for invited students, with need-based financial aid available.
Is there an age requirement for the Earth Science Olympiad?
For the 2026 cycle, students had to be at least 15 by the first day of training camp to attend. Younger students could still take the open exam for practice and experience.
What topics are on the International Earth Science Olympiad?
IESO covers geology, geophysics, meteorology, oceanography, astronomy as it relates to Earth, and environmental science. The USESO publishes a syllabus outlining what the open exam can test.
How hard is the USESO open exam?
Hard. USESO itself describes its exams as rigorous and requiring extensive study, and only 40 students nationwide advance to camp. Most strong candidates spend months working through past exams and earth science textbooks.
Where is the International Earth Science Olympiad being held?
The 2026 IESO was held in Turin, Italy, from August 20 to 27. The 2027 competition is scheduled for Matsue, Japan.
Does the Earth Science Olympiad help with college admissions?
Making the national team is a rare credential, since only four U.S. students earn it each year. Advancing to the training camp alone puts you in a group of 40, which is a specific, verifiable result you can list on an application.
The Bottom Line
The international earth science olympiad is one of the hardest teams in the country to make, and the path is simple to follow: open exam in March, camp in June, IESO in late summer. Start studying in the fall, use past exams to find your weak areas, and line up a proctor before winter break. Even if you stop at the open exam, months of serious earth science study is the exact background you need to run your own project with public data.
If you want to turn that knowledge into original research with your name on it, the Aspire Research Fellowship pairs you 1:1 with a PhD mentor and a recent ISEF champion for 12 weeks. It's open to grades 8 through 11, more than 20,000 students have come through Aspire, and about 10% of applicants get in.
Apply to the Aspire Research Fellowship →
Want other competitions to aim for? See our breakdown of academic research competitions for high school students.