CARO Pass Rate 2026: What the Data Shows

The Only Real Number We Have

Anyone searching for a "CARO pass rate" quickly discovers the same problem: there is no glossy infographic, no year-over-year trend chart, and no first-attempt success percentage published anywhere by the Refrigerating Engineers & Technicians Association (RETA). What does exist is a single figure buried in RETA's own newsletter - the November/December 2024 edition of the Breeze - which reports 71% after all attempts for the 10-month 2024 reporting period covering the Certified Assistant Refrigeration Operator credential.

That is the entire public dataset. There is no 2023 comparison, no 2025 update at the time of writing, and no breakdown by domain, region, or test center. Anyone quoting a different number, a trend line, or a "first-attempt pass rate" for CARO is either guessing or importing statistics from an unrelated certification that happens to share the same acronym. This article sticks strictly to what RETA has published and explains how to use that one data point productively.

What "71% After All Attempts" Actually Means

"After all attempts" is a specific statistical phrase, and it matters. It means the 71% figure includes candidates who passed on their second, third, or later sitting, not just those who cleared the bar the first time they sat for the exam. A first-attempt rate - if RETA ever published one - would almost certainly be a different (likely lower) number, because it wouldn't be smoothed by retakes. This distinction matters for how you plan. A 71%-after-all-attempts figure tells you that roughly seven in ten candidates eventually pass, given enough tries, study revisions, and familiarity with the question format. It does not tell you your odds on the first sitting, and it doesn't tell you how many attempts the average candidate needed to get there.

Why There's No Published First-Attempt Rate

RETA does not break out first-attempt versus retake data publicly, and the 10-month 2024 window itself is a limited reporting period rather than a full annual cycle. This is common among smaller certifying bodies administering a niche, entry-level credential through Kryterion/Webassessor delivery rather than a mass-market testing vendor. Without a large enough candidate pool to slice into monthly or quarterly cohorts, RETA appears to report pass-rate data periodically rather than continuously.

Practically, this means you should stop looking for a more precise number and instead focus on the variables you can actually control: how well you understand the CARO exam domains, how closely you've matched your study time to the official weighting, and how comfortable you are with the four-option, single-best-answer format under a 180-minute clock.

How Domain Weighting Predicts Where Candidates Lose Points

Because RETA doesn't publish domain-level pass data, the next best proxy for difficulty is the official domain weighting itself. Heavier-weighted domains carry more scored questions, so a weak spot there costs more than a weak spot in a lightly weighted domain. Here's the full breakdown of the 100 scored questions:

Safety alone accounts for one-fifth of the scored exam - more than double the weight of any other domain besides compressor operation and maintenance. That imbalance is the clearest quantitative hint available about where a marginal candidate is statistically most likely to lose the points that separate a 68% from a 70%.

For a full walkthrough of all ten domains, including the lighter-weighted but still testable areas like purging and refrigerant properties, see the complete CARO exam domains guide.

Exam Format Mechanics That Affect Outcomes

Pass-rate discussions are incomplete without understanding the mechanics that produce the score in the first place. The CARO exam is delivered as a computer-based test through Kryterion/Webassessor at RETA Network Test Centers and Kryterion Test Centers. It contains 110 questions total, but only 100 are scored - the remaining 10 are unscored pilot items mixed in indistinguishably, so no candidate can tell which questions count and which don't.

You have 180 minutes to complete all 110 questions, and passing requires 70 correct answers out of the 100 scored items - exactly 70%. There is no partial credit and no bonus for speed. A simple nonprinting calculator with cleared memory is permitted, and selected references are supplied onscreen during the exam, but this is not an open-book test; you cannot bring your own materials or notes.

For the exact scoring mechanics and why 70/100 is the number that matters, see CARO Passing Score 2026: Exactly What You Need to Pass. If you want a broader sense of how the format compares to other technical certifications in terms of difficulty, How Hard Is the CARO Exam? covers that in more depth.

Who Sits the CARO Exam

CARO is explicitly an entry-level credential. RETA requires no minimum refrigeration work experience to sit for it - it's designed for operators working under supervision in industrial refrigeration facilities such as cold storage warehouses, food processing plants, and distribution centers using ammonia or other industrial refrigerant systems. That eligibility structure has a direct bearing on the pass-rate conversation: a credential open to newer operators, rather than restricted to veterans with years of hands-on experience, will naturally include candidates with a wider range of prior exposure to the material.

If you're unsure whether you qualify or want to understand how CARO fits into a longer RETA credential track, the CARO Requirements 2026 page walks through eligibility in detail. Employers hiring for assistant operator, plant helper, and junior refrigeration technician roles frequently list CARO as a preferred or required credential - you can see typical job titles and descriptions in the CARO Jobs overview.

Building a Preparation Window Around the Data

Since there's no domain-specific pass/fail breakdown, the smartest use of your prep time is to mirror the official weighting rather than guess at difficulty. A simple, honest allocation puts the most hours against safety and compressor operation, moderate time against condensers, lubrication, and fundamentals, and lighter review passes against purging and compressor types.

This isn't a generic study calendar borrowed from another field - it's sequenced specifically around CARO's own 20/14/12 domain weighting so your heaviest study hours land on the material that carries the most scored questions. For a more granular breakdown of what to study each week and how to source materials, the CARO Study Guide 2026 goes deeper into content and the currently linked January 2023, Revision 3 guide.

Retake Considerations and Cost

Because the published 71% figure is an all-attempts number, retakes are clearly part of the real-world picture for a meaningful share of candidates. That makes the cost of a repeat attempt worth factoring into your planning upfront. The 2026 CARO examination fee is $570 for RETA members and $865 for nonmembers - a gap wide enough that joining RETA before registering is worth evaluating if you might need more than one sitting.

A full cost breakdown, including how the fee compares across membership status and what else factors into total spend, is available in CARO Certification Cost 2026: Complete Pricing Breakdown. If you're weighing whether the credential justifies the expense and time relative to job prospects, Is the CARO Certification Worth It? and the CARO Salary Guide 2026 both address that question directly. And once certified, remember that CARO lasts three years and renewal requires 24 documented professional development hours (2.4 CEUs) plus an application and fee before expiration - HAZWOPER training does not count toward those PDHs.

Frequently Asked Questions

For a condensed, one-page reference you can review the night before your exam, see the CARO Cheat Sheet 2026, and check current testing windows on the CARO Exam Dates 2026 page before you register. You can also start running timed practice questions now to get a realistic feel for the format described above.