How Many BUD/S Classes Happen Per Year? Typical Schedule Explained
Meta description: Learn how many BUD/S classes typically begin each year, how the Navy training pipeline affects the schedule, and why class dates can change.
The U.S. Navy typically starts about two Basic Underwater Demolition/SEAL (BUD/S) classes per year, often spaced roughly six months apart. That figure is a useful general estimate, not a fixed annual quota: the Navy does not guarantee the public a set number of class starts, and schedules can shift with operational needs, staffing, facilities, and training-pipeline changes. A class start also does not mean every student will graduate. BUD/S is deliberately demanding, and candidates may withdraw, be removed, or be reassigned during training.
How Many BUD/S Classes Happen Per Year?
For a straightforward answer, about two BUD/S classes generally start each year. In everyday discussion, this is often described as one class beginning every six months. The wording matters: “about two” describes the commonly reported cadence, while the exact timing and number can vary from year to year.
BUD/S class numbers identify successive training groups, but the number alone does not establish how many classes started in a particular calendar year. Classes can begin near the start or end of a year, and training spans months. A class that begins late in one year may continue into the next, so counting classes that are active during a year is different from counting new starts.
The Navy’s public-facing information explains the selection and training process but does not function as a guaranteed, year-by-year public schedule of BUD/S class start dates. Candidates should rely on their Navy recruiter or official Naval Special Warfare channels for current guidance rather than treating a general annual estimate as a confirmed date.
Why the Annual Number Is Not a Fixed Guarantee
BUD/S is part of a larger Navy Special Warfare training pipeline. Its schedule depends on more than a calendar. Training staff, available facilities, class size, candidate readiness, medical and administrative processing, and changes to the overall pipeline can all affect when a class begins or how it proceeds.
The Navy also needs to align training capacity with personnel requirements. That does not mean every available seat will be filled or that every candidate who arrives will remain in training. If candidates leave or are removed, the number of people still training can fall substantially without changing the original class start.
Public sources may use different ways of describing a “class.” Some refer to the group that begins BUD/S; others discuss a class number, a phase, or a group that reaches graduation. These are not interchangeable measures. For an annual count, the clearest question is: How many new BUD/S classes began during that calendar year?
What BUD/S Is and Where It Fits
BUD/S stands for Basic Underwater Demolition/SEAL. It is an initial training course for candidates pursuing a place in the Navy SEAL community. It is not the entire path to becoming a SEAL. Candidates must meet entry requirements and complete the required screening and training stages, and BUD/S completion is followed by additional qualification training.
The Naval Special Warfare Command describes BUD/S as a course divided into three phases: First Phase, Second Phase, and Third Phase. The phases develop different skills, including physical conditioning and teamwork, combat diving, and land warfare. The course is widely described as lasting approximately 24 weeks, although schedules and training details can change. Current official Navy information should take precedence over older descriptions.
After BUD/S, successful candidates continue through SEAL Qualification Training (SQT) and other required training before earning the Navy SEAL designation. Therefore, a BUD/S class is one stage in a longer process—not a group that completes all SEAL training at the same time it starts.
How Long Is a BUD/S Class?
BUD/S is commonly described as a roughly 24-week course, organized into three phases. That duration refers to the core course, not necessarily the full period a candidate spends in the training pipeline. Candidates may spend additional time in preparatory training, medical or administrative holds, or follow-on instruction. Individual timelines can differ.
Training schedules are also subject to change. A class may experience adjustments to its timeline, and candidates may be held back or reassigned under applicable Navy procedures. As a result, a simple calculation—two starts per year multiplied by a 24-week course—cannot precisely predict how many classes will be active at any particular time.
It is also important to distinguish a scheduled course length from a guaranteed completion date. A candidate’s progress depends on meeting required standards and successfully completing each phase. A person who does not meet a standard may receive additional training, be removed from the course, or be considered for another assignment, depending on the circumstances and Navy policy.
What Happens During the Three BUD/S Phases?
First Phase: Physical Conditioning
First Phase emphasizes physical conditioning, water competency, teamwork, and mental resilience. It includes the demanding period commonly known as Hell Week, a concentrated test of endurance and performance under sleep deprivation. Hell Week is a component of First Phase, not a separate BUD/S class or an additional annual course.
Descriptions of specific events and standards can change, and public accounts may not reflect current training procedures. The central purpose is to assess whether candidates can work effectively, follow instructions, and perform safely in demanding conditions. The fact that candidates enter the phase does not ensure that they will advance to the next one.
Second Phase: Combat Diving
Second Phase focuses on combat diving and underwater skills. Candidates learn to use diving equipment and perform tasks in challenging conditions while meeting safety and performance requirements. Water confidence and disciplined procedures are essential because underwater training carries real risks.
Not every candidate who completes First Phase moves through Second Phase without difficulty. Candidates must demonstrate the required competencies, and the Navy may adjust individual training pathways in accordance with its rules and needs.
Third Phase: Land Warfare
Third Phase focuses on land-warfare skills, including instruction and field training. Candidates apply skills in demanding outdoor settings and continue to be evaluated on performance, judgment, and teamwork. Completing this phase is a major milestone, but it is not the end of the full SEAL qualification pipeline.
After BUD/S, candidates who successfully advance continue to SQT and other required training. This distinction explains why news or online posts about a class “finishing” BUD/S should not automatically be read as meaning that every person in that class has completed the entire process to become a SEAL.
How Class Starts, Class Size, and Graduation Differ
Questions about how many classes happen per year can refer to three different things: new class starts, the number of candidates in training, or the number of graduates. The answers are not the same.
| Measure | What It Counts | Why It Can Differ |
|---|---|---|
| Class starts | New groups beginning BUD/S | Starts follow a training schedule that may change. |
| Active classes | Groups in any BUD/S phase during a period | A class remains in training for months and may cross calendar years. |
| Graduates | Candidates who complete the course | Attrition and individual progress affect the final number. |
Class size and graduation figures are not always published consistently in a single, comparable format. Estimates found in articles, videos, or discussion forums may refer to different points in the pipeline. A reported number of people at the start should not be treated as the number who graduate, and an anecdote about one class does not establish a universal class size or pass rate.
Why BUD/S Has High Attrition
BUD/S is designed to test demanding physical and mental requirements. Candidates can leave training voluntarily, fail to meet a required standard, sustain an injury, or be removed for other reasons under Navy procedures. This is why the number of candidates in a class can decrease considerably from its initial size.
Attrition is not a reliable way to infer the annual number of classes. A high or low graduation count could reflect the size of incoming groups, candidate outcomes, or other factors. It does not by itself show that the Navy added or canceled a class. Likewise, a class number or graduation ceremony cannot establish a precise annual start schedule.
For someone considering the program, the practical takeaway is to focus on eligibility, preparation, and official instructions—not on assumptions that a particular class will start on a particular month. Recruiting and training staff can give candidates information that reflects current requirements and scheduling.
How to Find Current BUD/S Schedule Information
Because the Navy does not publish a dependable public calendar guaranteeing two starts on specific dates every year, online schedules should be treated cautiously. A post may be outdated, refer to a different training stage, or repeat an estimate without a primary source.
- Check official Navy and Naval Special Warfare sources for current descriptions of training and program requirements.
- Ask a Navy recruiter about current eligibility, screening, and the candidate’s expected processing timeline.
- Confirm what a date refers to: a class start, a selection event, a preparatory course, a phase, or a graduation.
- Check publication dates and distinguish official information from personal accounts or unsourced estimates.
Relevant starting points include the U.S. Navy’s Navy SEAL career information and the Naval Special Warfare Command. These sources can explain the official training pathway, but individual candidates should seek direct guidance for current scheduling and eligibility details.
Common Questions About BUD/S Class Frequency
Does the Navy hold exactly two BUD/S classes every year?
No public rule guarantees exactly two starts in every calendar year. About two starts per year is a common general estimate, but schedules may change. The exact number for a particular year should be confirmed through current Navy channels.
Does one BUD/S class start every six months?
That is a useful shorthand for the typical cadence, not a promise of precise six-month intervals. Start dates can shift, and the calendar interval between two classes may not be exactly half a year.
Are two classes active at the same time?
They can be, depending on the timing of starts and how long each group remains in training. Since BUD/S lasts several months, a class can overlap with another in the broader training schedule. A class’s presence in training during a year does not mean it began that year.
How many people graduate from each class?
There is no single number that applies to every class. Class size at entry and the number who complete BUD/S can vary. Attrition, individual performance, medical issues, and training requirements all affect outcomes, and public reports may use different counting methods.
Does graduating BUD/S mean someone is already a Navy SEAL?
BUD/S graduation is an important step, but it is not the whole qualification process. Candidates continue to SQT and other required training. The SEAL qualification pathway extends beyond the initial BUD/S course.
Key Takeaway
About two BUD/S classes typically begin each year, often roughly six months apart. That is a general pattern rather than a guaranteed schedule. Class starts, active training groups, and graduates are different counts, and the number of candidates who finish can vary substantially. For specific dates or individual planning, official Navy guidance is more reliable than a fixed annual estimate.