Quick answer: The 2025-26 USACO season was a transitional year that brought several notable changes to how contests are run. The US Open moved to in-person proctoring, Gold and Platinum contestants now have a fixed window to start a contest if they want a certified score, and Platinum participants were reset to Gold at the start of the season. USACO has said it may keep some of these practices in future seasons, so they are worth understanding before the next one begins.
The 2025-26 season’s online contests and the US Open have wrapped up, the training camp ran from May 21 to May 30, and the US team now heads to the International Olympiad in Informatics (IOI) in Uzbekistan from August 9 to 16. That makes the summer a natural time to review what changed and to plan ahead. Whether you are in Bronze, Silver, or Gold, it helps to understand these changes before the next season starts.
What changed in the USACO 2025-26 season?
Change 1: Platinum participants were reset to Gold
Traditionally, USACO promotions have carried over from one season to the next: once you advanced to a division, you stayed there. In the 2025-26 season, that changed for the top division. Platinum participants were reset to Gold at the start of the season, and USACO described this as “a practice we may continue in the future.”
In other words, a Platinum placement may no longer be permanent. If USACO keeps this practice, competitors would need to re-earn Platinum each season by clearing the Gold promotion cutoff again, rather than relying on a placement from a previous year.
What this means for you: If you reached Platinum in a past season, plan to compete in Gold again and re-qualify. This is not a judgment about your ability; it is simply how the reset works.
Change 2: A start window for certified scores in Gold and Platinum
What a certified score is: USACO’s online contests are open to anyone, but only a “certified score” counts as an officially recognized result for the record and rankings.
The rule: Normally, contestants can begin their timed attempt at any point during the multi-day contest window. The certified-score rule adds a condition for the top two divisions. To have a result certified, Gold and Platinum contestants must start right when the problems are released, on Saturday at 12:00 noon Eastern Time, within a roughly 15-minute window (12:00-12:15 ET). You can still work on the problems after that window, but the result will not be certified.
For students in China: During the winter contest months, 12:00 noon Eastern Time on Saturday is about 1:00 AM Sunday in Beijing, so the start window falls around 1:00 to 1:15 AM. A simple routine helps: log in a little early, confirm your setup works, and set more than one alarm so you do not miss the window.
What the proctored US Open and camp selection mean
Change 3: The US Open moved to in-person proctoring
The US Open is the season’s championship round. In 2025-26 it was held on March 28 as a proctored, in-person exam at designated test sites, rather than an at-home online contest.
Why it matters: In-person proctoring makes top scores more credible, because they are earned under supervised conditions. It also means the US Open is no longer something you can complete from home. USACO publishes the list of designated sites; check usaco.org for the current locations and any updates before planning around it.
Change 4: Camp finalist selection ran through the proctored US Open
For the 2025-26 season, training-camp selection worked like this: top competitors from the online contests were invited to the proctored US Open, and that US Open result was the primary determinant of who became a training-camp finalist. USACO has noted this was a transitional-year arrangement that may be adjusted in future seasons.
Who is most affected?
One piece of context matters here: USACO’s online contests and division promotions are open to students worldwide, but only pre-college students in the USA are eligible for training-camp finalist selection and the USA IOI and EGOI teams.
For international students, including those in China: The certified-score start window and the Platinum reset are the changes that affect your online contest experience most directly. The proctored US Open and camp selection are part of the US team-selection pipeline, which international students are not eligible for. You can still earn Gold and Platinum promotions and certified scores, which are strong, verifiable achievements in their own right.
If you reached Platinum previously: plan for the reset and for re-qualifying, as described above.
If you are in Silver or Gold: the reset can change who you are competing against for promotion, so a well-planned season still pays off.
Using the summer to prepare for the next season
USACO has not yet published the schedule or rules for the next season, so exact dates are not confirmed. As a rough guide, the 2025-26 season ran three online contests between early January and late February, followed by the proctored US Open in late March. If a similar pattern holds, the first contest would be several months away, which makes the summer a useful window for focused practice.
During the school year, many students can spare only a few hours a week for USACO. Over the summer, it is realistic to do much more, so it is the most efficient stretch for building skills. Promotion cutoffs vary from contest to contest; in recent seasons, monthly-contest cutoffs have often fallen in the 650 to 750 range out of a maximum of 1000, which is a reasonable target to train toward. USACO itself also offers hundreds of hours of free online training resources and past problems with full solutions, which are the best place to start.
Summer goals by current division
Currently in Bronze: Aim to master the core Silver topics: greedy algorithms, binary search, prefix sums, and graph traversal (DFS), with the goal of promoting to Silver in an early contest next season.
Currently in Silver: Work toward the Gold topics: dynamic programming, graph theory and shortest paths, and efficient data structures such as union-find, aiming to complete the Silver-to-Gold promotion during the next season.
Currently in Gold: Summer is a good time to build toward Platinum, which emphasizes advanced modeling and techniques such as segment trees and advanced dynamic programming, with no fixed syllabus and no fixed upper bound on difficulty. If you have not already, this is also a good point to commit to C++, the only language supported at IOI and the practical choice for the higher divisions.
Free USACO preparation materials
We maintain a set of free practice problems, study guides, and past-contest materials. Reach out or scan the QR code to access them.