- ALOS stands for Average Length of Stay — a statistic used in government and healthcare reporting, not a personal departure deadline.
- Your lawful stay is set by the “Admit Until” date on your I-94, not by any ALOS figure.
- If you see ALOS at all, it is usually in a travel-history download, a FOIA file, or a government report — not on a standard admission record.
ALOS stands for Average Length of Stay. It is a statistic, not a rule that applies to you personally, and it does not set the day you must leave the United States. If you are trying to find out how long you can stay, the number that matters is the “Admit Until” date on your I-94 admission record.
A standard nonimmigrant I-94 does not contain an ALOS field. The admission record shows your class of admission and the date your authorized stay ends. Your visa expiration date is separate: it controls when you may request entry, not how long you may remain after you arrive.
What “Average Length of Stay” actually measures
ALOS is an average calculated across many people, not a value tied to one traveler. Different agencies use it to summarize how long a group stayed in a given situation.
U.S. Customs and Border Protection and the Department of Commerce use travel statistics like average length of stay to study visitor patterns. The Department of Homeland Security and Immigration and Customs Enforcement use ALOS in detention reporting to show how long people remain in custody. Hospitals use the same term to track patient stays. In each case the figure looks backward at time already spent, and it never grants or extends permission.
Where you might actually see the term
Because ALOS is a reporting metric, it rarely appears on the documents a traveler carries. You are most likely to encounter it in a travel-history download from CBP, a record released through a Freedom of Information Act request, or a published government report. In those files it works as a summary calculation rather than an instruction.
That distinction matters, because a statistic can describe how a system behaves, but only your admission record can tell you when you must leave.
The detention figures show how the term shifts by context
Government detention reports make the point clearly, because the same three letters describe very different numbers depending on the population being measured.
| Context | Figure | Source note |
|---|---|---|
| Other Immigration Violators in ICE custody | about 14.3 days | DHS FY 2026 budget overview |
| People with criminal charges or convictions in ICE custody | 38.6 to 44.7 days | DHS FY 2026 budget overview |
| Pregnant, postpartum, and nursing individuals in ICE custody | 11.27 days | ICE report dated Jan. 18, 2024 |
| General population in that report | 35.77 days | ICE report dated Jan. 18, 2024 |
| CBP-apprehended cases | about 29.8 days | DHS Annual Performance Report, April 2022 |
| Interior criminal cases | 53.9 days | DHS Annual Performance Report, April 2022 |
None of these figures apply to a visitor’s authorized stay. They describe time in custody, averaged across groups, and appear in budget and oversight documents rather than on any traveler’s record.
When your own length of stay can still matter
Even though ALOS is not a deadline, how long you have stayed in the past can affect future travel. Consular officers may review a traveler’s prior stays during a visa interview, especially when earlier visits approached the 180-day mark. Long or repeated stays can prompt questions about immigrant intent or unauthorized work.
Your travel history follows you into the next application, so keeping visits comfortably within your authorized period helps avoid those questions later.
How to check your real authorized stay
To confirm how long you may remain, retrieve your I-94 record rather than relying on any statistic:
- Go to the official CBP I-94 website and select “Get Most Recent I-94.”
- Enter your name, date of birth, and passport details exactly as they appear in your travel document.
- Read the “Admit Until” date. That date, not your visa stamp, sets the last day of your authorized stay.
- If the date looks wrong, contact CBP or a Deferred Inspection site to correct it before it causes an overstay.
Processing rules and website addresses can change, so verify current information at cbp.gov and uscis.gov.
