How many days can a substitute stay in one classroom? The limit depends on your state and your permit

There is no national number. How long you can stay in one classroom is set by your state, and inside a state it usually depends on which permit or license you hold. In the three states we read for this post, the limit runs from 5 consecutive days to a full academic year. California's basic permit allows 30 days for any one teacher in a school year, and 20 in a special education classroom. Illinois allows 90 days on a Substitute License and 5 consecutive days on a Short-Term Substitute License. Oregon allows 10 consecutive days on two of its licenses and up to one academic year on the third.

We read each state's own page on October 12, 2026. This post covers what those pages say, how to tell which kind of limit you are under, and where to find the rule for a state we did not cover. It is not legal advice. Your state's licensing agency and your district's HR office decide how the rule applies to you.

First, check how your state counts

The same number can mean different things. Before you compare your assignment to a limit, look for three things in the wording.

• Per teacher or per assignment. California counts days "for any one teacher during the school year." Oregon counts days "in a single assignment."
• Consecutive or total. Oregon's 10-day limit and Illinois's 5-day limit are written as consecutive days. California's 30-day limit is written as a total for the school year, with no mention of consecutive days.
• Absent teacher or vacant position. Illinois has one number for covering a teacher who is under contract and a different number for a position with no teacher at all.

California: 30 days on the basic permit, 20 in special education

The Commission on Teacher Credentialing issues the permits. Its page for the Emergency 30-Day Substitute Teaching Permit says: "The holder may serve as a substitute for no more than 30 days for any one teacher during the school year, except in a special education classroom, where the holder may serve for no more than 20 days for any one teacher during the school year."

The Emergency Career Substitute Teaching Permit has a higher limit. The Commission's page says the holder may serve "no more than 60 days for any one teacher during the school year," with the same 20-day limit in a special education classroom. That permit asks for "Three consecutive years" of "at least 90 days per year of day-to-day substitute teaching" before you apply.

California's rules are changing. Assembly Bill 2490 was chaptered by the Secretary of State on September 27, 2026, as Chapter 614, Statutes of 2026. The bill summary on CalMatters Digital Democracy says it creates a second way to qualify for the career permit, through professional development, an orientation and an assigned mentor, and that a permit issued that way lets the holder serve "up to 70 cumulative days in a single classroom," including for special education teachers. Both Commission pages were last updated on October 1, 2026, and neither mentions 70 days yet. We could not open the bill text on the Legislature's own site, so we cannot tell you the date the new route starts. Until the Commission publishes it, the 30, 60 and 20 day figures above are what its pages state.

Illinois: 90 days, 5 days, or 30 days in a vacancy

The Illinois State Board of Education publishes a one-page comparison of its two substitute licenses, Become a Substitute Teacher, dated August 2022.

• Substitute License. The holder "Can serve in place of a contracted teacher for up to 90 days or in an emergency situation for up to 30 days when no teacher is under contract with the district unless the district receives approval of an extension from the ROE/ISC." ROE and ISC are the Regional Office of Education and the Intermediate Service Center.
• Short-Term Substitute License. The holder "Can teach up to five consecutive days per licensed teacher."

The Board's Short-Term Substitute Teaching page adds two details. It words the 90-day limit as "90 consecutive paid school days per licensed teacher in the same school year," and it gives a higher limit, 120 consecutive paid school days, to a substitute who holds a Professional Educator License. It also says a short-term substitute may serve 15 consecutive paid school days per teacher when the state has declared a disaster proclamation. That page is marked as archived, with a notice that its content "may no longer be in effect," so confirm those three details with your Regional Office of Education before you rely on them.

The vacancy rule is the one that surprises people. If you are covering a room with no teacher under contract, the 90-day figure is not your limit. The 30-day emergency figure is, unless the district gets an extension approved.

Oregon: 10 consecutive days, or up to an academic year

Oregon's Teacher Standards and Practices Commission lists three substitute licenses in its guide, Substitute Teaching in Oregon, which states the rules in effect as of July 1, 2023.

• Substitute Teaching License. "Up to one academic year in a single assignment." This license requires a bachelor's degree and a teacher preparation program.
• Restricted Substitute Teaching License. "No more than 10 consecutive days in a single assignment."
• District Substitute Teaching License. "No more than 10 consecutive days in a single assignment and only within the sponsoring district."

The rule behind the restricted license leaves no room for exceptions. OAR 584-210-0150 reads: "Any single assignment on the Restricted Substitute Teaching License may not exceed 10 days consecutively under any circumstances."

Oregon also has a rule that is about your employment status, not about a cap. The same guide says a district must classify a substitute assignment as a temporary position when it determines the substitute will be employed "for 60 or more consecutive days (for districts in a five-day week) or 48 consecutive days (for districts in a four-day week) in any one assignment for the same teacher." The guide addresses that note to districts and ties it to holders of the full Substitute Teaching License.

Some rules are about notice, not a cap

Not every day count you hear about is a limit on you. Texas Education Code section 21.057, as published at texas.public.law, says a district that assigns "an inappropriately certified or uncertified teacher to the same classroom for more than 30 consecutive instructional days during the same school year shall provide written notice of the assignment to a parent or guardian of each student in that classroom." That section puts a duty on the district to notify parents. The text we read does not say the assignment has to end.

So when someone tells you there is a 30-day rule, ask which kind. A limit on the days you may serve and a deadline for the district to send a notice are different rules, even when the number is the same.

How to find your own state's limit

• Start with the exact name on your permit or license. In all three states above, the limit follows the document you hold, not the job you accepted.
• Go to the agency that issued it. That is the state education agency or a separate licensing commission. Search its site for your permit's name and read the sentence that says what it authorizes.
• Check the three wording points. Per teacher or per assignment, consecutive or total, absent teacher or vacant position.
• Ask district HR to confirm the count. HR tracks the days and decides when an assignment has to end or change. If you work through a staffing agency, ask the agency too.
• Ask before day one of a long job. If an assignment is expected to run past your limit, the district needs to know which permit you hold when it plans the coverage.

If you want long assignments, the limit on your current permit is part of the plan. Our earlier post on landing long-term assignments covers the rest.

What we can't tell you

• Your state, if it is not one of these. We read agency pages for California, Illinois and Oregon, and one Texas statute. Other states have their own rules and we have not sourced them here. New York is one we tried and could not open.
• What happens when you reach the limit. The pages we read state the limits. They do not say what a district does on the day after, whether a different permit can take over, or how your pay changes on a long assignment.
• When California's 70-day route begins. The bill is chaptered. We could not read its operative date, and the Commission's permit pages do not describe it yet.
• Whether older pages are still current. The Illinois one-pager is dated August 2022 and the Oregon guide states rules as of July 1, 2023. Rules change, so confirm with the agency.
• How your district counts. Half days, days split across two teachers, and breaks in the middle of an assignment are questions for HR.

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