Triennial IEP reevaluation: the 3-year rule, and when existing data is enough
A reevaluation must happen at least once every three years and not more than once a year — but both of those boundaries can move by agreement between the parent and the district, and neither is a decision the school makes alone (34 CFR § 300.303). The bigger misunderstanding is what a reevaluation is: it does not automatically mean new testing. Every reevaluation starts with a review of existing evaluation data, and if the team concludes no additional data are needed, that conclusion is legitimate — but it triggers a written notice duty most teams forget (34 CFR § 300.305). Here is the whole sequence, in the order you will actually run it.
What triggers a reevaluation
The triennial date is only one of five triggers. Teams that track only the calendar miss the other four.
| Trigger | The rule | The escape hatch | Cite |
|---|---|---|---|
| The three-year date arrives | At least once every 3 years | Unless the parent AND the agency agree a reevaluation is unnecessary | § 300.303(b)(2) |
| Educational or related services needs warrant it | Reevaluate — no waiting for the triennial date | None; this is a duty when the condition is met | § 300.303(a)(1) |
| The parent requests one | Reevaluate | Not more than once a year unless both agree | § 300.303(a)(2), (b)(1) |
| A teacher requests one | Reevaluate | Not more than once a year unless both agree | § 300.303(a)(2), (b)(1) |
| The team wants to exit the student | Must evaluate before determining the child is no longer a child with a disability | Graduation with a regular diploma, or aging out of FAPE eligibility | § 300.305(e) |
Source: 34 CFR §§ 300.303, 300.305. Your state may impose a shorter cycle or additional steps — state rules can exceed the federal floor but not fall below it.
Step 1 — the review of existing data (RED), and it does not need a meeting
Under § 300.305(a)(1), the IEP Team and other qualified professionals must review existing evaluation data on the child. The regulation names four categories, and a review that touches only the last psych report is not a review of existing data:
| What § 300.305(a)(1) requires you to review | What that looks like in practice |
|---|---|
| Evaluations and information provided by the parents | Outside neuropsych report, pediatrician letter, parent input form, the parent's own description of what has changed at home |
| Current classroom-based, local, or State assessments | Universal screeners, benchmark assessments, state test results, curriculum-based measures |
| Classroom-based observations | Structured observation notes, work samples across settings, on-task data |
| Observations by teachers and related services providers | SLP session notes, OT progress data, the general education teacher's account of performance in the gen-ed setting |
§ 300.305(b) says the group may conduct this review without a meeting. That is a real efficiency, and it is also why some districts handle triennials by paperwork. If you go that route, remember that § 300.305(a)(2) still requires input from the child’s parents — no-meeting is not the same as no-parent.
Step 2 — decide what additional data, if any, are needed
On the basis of that review and parent input, the team identifies what additional data are needed to answer four specific questions (§ 300.305(a)(2)). For a reevaluation, the first three are phrased in the language of continuation — does the child continue to have a disability, does the child continue to need special education:
- Does the child still have a disability, and what are the child's educational needs?
- What are the present levels of academic achievement and related developmental needs?
- Does the child continue to need special education and related services?
- Are any additions or modifications needed to the services so the child can meet the annual goals and participate in the general education curriculum?
If additional data are needed, § 300.305(c) requires the agency to administer the assessments needed to produce them — and § 300.300(c)(1) requires informed parental consent before conducting them. The evaluation itself must then meet the full standards of §§ 300.304 through 300.311 (variety of assessment tools, no single measure, technically sound instruments, assessment in all areas of suspected disability).
Step 3 — if no additional data are needed, send the notice
This is the compliance failure that shows up in file reviews. When the team decides no additional data are needed, § 300.305(d)(1) requires the agency to notify the parents of two things:
- That determination and the reasons for it — not just “no additional testing is needed,” but why the existing data answered the four questions.
- The parent’s right to request an assessment to determine whether the child continues to be a child with a disability and to determine the child’s educational needs.
The agency is not required to conduct that assessment unless the parent requests it (§ 300.305(d)(2)) — but the parent cannot request what they were never told they could request, which is exactly why the notice is mandatory. If your district handles this through prior written notice, see prior written notice for the content requirements.
Exiting a student: evaluate first, with two exceptions
§ 300.305(e)(1) requires an evaluation before determining that a child is no longer a child with a disability. The two exceptions in § 300.305(e)(2) are narrow and specific:
- Graduation from secondary school with a regular diploma, or
- Exceeding the age eligibility for FAPE under State law.
In both exception cases the student is owed a summary of academic achievement and functional performance, including recommendations on how to assist the child in meeting their postsecondary goals (§ 300.305(e)(3)) — commonly called the Summary of Performance. Note the logic: the SOP is required precisely where the exit evaluation is not. It is the document that carries forward to college disability services and vocational rehabilitation, so it is worth writing well rather than as a formality. The postsecondary goals it references come from the transition plan — see transition IEP goals.
A sample “no additional data” rationale
Invented sample, written for a fictional student, to show the level of specificity § 300.305(d)(1) expects when you document the reasons:
The team reviewed the 2023 psychoeducational evaluation, three years of curriculum-based reading probes, fall and winter benchmark screeners, two structured classroom observations, the SLP’s session data, and parent input gathered by phone on September 12. Existing data continue to document a specific learning disability in basic reading and answer the team’s questions about present levels and service needs: decoding remains 2.1 grade levels below placement with a stable growth slope on weekly probes, and the current service model continues to produce measurable progress. The team determined no additional assessments are needed to determine continued eligibility or educational needs. The parent was notified of this determination, the reasons above, and the right to request an assessment; the parent did not request one as of October 3.
Notice what makes it defensible: named data sources with dates, a stated reason tied to the four regulatory questions, and an explicit record that the parent was told about the right to request testing. That is the difference between a rationale and a checkbox. Keeping the underlying probe data organized year-round is what makes this possible — see the special education data binder.
Frequently asked questions
How often is a special education reevaluation required?
At least once every three years, unless the parent and the public agency agree that a reevaluation is unnecessary — and not more than once a year, unless the parent and the agency agree otherwise (34 CFR § 300.303(b)). Both halves are agreements between the parent and the district, not unilateral district decisions. A reevaluation must also happen outside that cycle whenever the child's educational or related services needs warrant one, or whenever the parent or a teacher requests one (34 CFR § 300.303(a)).
Can a teacher request a reevaluation?
Yes. 34 CFR § 300.303(a)(2) names the parent and the teacher as people whose request triggers the reevaluation duty. This is one of the most underused provisions in IDEA — a case manager or a general education teacher who believes the disability picture has changed does not have to wait for the triennial date. The once-a-year limit in § 300.303(b)(1) still applies unless the parent and the agency agree otherwise.
Does a triennial reevaluation always require new testing?
No, and this is the most common misconception in the process. Every reevaluation begins with a review of existing evaluation data under 34 CFR § 300.305(a) — prior evaluations, parent-provided information, current classroom-based/local/State assessments, classroom observations, and observations by teachers and related services providers. Only after that review does the team identify what additional data, if any, are needed. If the team determines no additional data are needed, the agency is not required to conduct assessments unless the parent requests them (§ 300.305(d)(2)).
Does the review of existing data require a meeting?
No. 34 CFR § 300.305(b) states plainly that the group may conduct its review without a meeting. Many districts still convene one, and there are good reasons to — it is a natural place to get parent input, which § 300.305(a)(2) requires the team to factor in. But the regulation does not force a meeting, so a district that handles the review by documented record review and parent contact is complying.
What notice is required if the team decides not to test?
This is the step teams most often miss. If the IEP Team and other qualified professionals determine that no additional data are needed, the public agency must notify the parents of (1) that determination and the reasons for it, and (2) the parent's right to request an assessment to determine whether the child continues to be a child with a disability and to determine the child's educational needs (34 CFR § 300.305(d)(1)). A 'no new testing' decision is not a quiet administrative choice — it carries an affirmative notice duty with a specific content requirement.
Do you need parent consent for a reevaluation?
Yes, for the assessments. Under 34 CFR § 300.300(c)(1), the agency must obtain informed parental consent before conducting any reevaluation. There is a meaningful exception: consent need not be obtained if the agency can demonstrate it made reasonable efforts to obtain consent and the parent failed to respond (§ 300.300(c)(2)). Note the difference between failing to respond and refusing — if the parent refuses, the agency may (but is not required to) use consent override procedures, and it does not violate its child-find or evaluation obligations if it declines to pursue the reevaluation (§ 300.300(c)(1)(ii)-(iii)).
Do you have to evaluate before exiting a student from special education?
Usually yes. Under 34 CFR § 300.305(e)(1), a public agency must evaluate a child before determining that the child is no longer a child with a disability. There are exactly two exceptions in § 300.305(e)(2): termination of eligibility due to graduation from secondary school with a regular diploma, or due to exceeding the age eligibility for FAPE under State law. Exiting a student because they are 'doing fine now' is not one of the exceptions — that requires an evaluation.
What is a Summary of Performance and when is it required?
When a student's eligibility ends because of graduation with a regular diploma or aging out, 34 CFR § 300.305(e)(3) requires the agency to give the child a summary of their academic achievement and functional performance, including recommendations on how to assist the child in meeting their postsecondary goals. It is required precisely in the two cases where no exit evaluation is required — the SOP is what replaces it. It travels with the student to college disability services, vocational rehabilitation, and employers.
Related guides
- The special education referral process — the initial evaluation side of the same regulations.
- Special education file review checklist — where a missing § 300.305(d) notice gets caught.
- IEP due date tracker — tracking triennial dates alongside annual review dates.
- IEP disability categories — what a category does and does not decide at reevaluation.
This guide summarizes 34 CFR Part 300 for educators and is not legal advice. States may set additional reevaluation requirements — confirm against your state’s special education regulations and your district’s procedures before relying on it.