CP4 Exam Dates 2026: Testing Windows, Deadlines & Scheduling

How CP4 Testing Actually Works: No Fixed "Windows"

If you're used to certification programs that only test candidates during a handful of scheduled weeks per year, CP4 works differently. The Cathodic Protection Specialist (CP4) exam is delivered by AMPP through Pearson VUE's network of computer-based testing centers. That means there isn't a single "spring window" or "fall window" the way there is with some paper-based professional exams - availability is driven by seat capacity at Pearson VUE locations near you, not by a fixed AMPP testing calendar.

In practice, this is good news for candidates: once your application is approved, you're not stuck waiting months for the next window to open. You choose a date and location that Pearson VUE has available, subject to normal appointment lead times. The tradeoff is that "exam dates" for CP4 are really a function of two things - how quickly your AMPP application clears, and how far in advance you book your Pearson VUE appointment - rather than a published list of testing dates on a calendar.

The March 2026 Exam Preparation Guide

AMPP periodically updates the reference document that governs exam content, structure, and policy for CP4 candidates. The version currently in effect is the March 2026 Exam Preparation Guide. This is the document you want in hand before you commit to a study plan or lock in a testing date - it defines the current combined Theory and Applied exam format, the domain weighting, and the rules around reference materials and calculators.

Because AMPP revises this guide from time to time, candidates who are scheduling their exam months in advance should periodically check that no interim update has changed eligibility language, domain weights, or exam-day policy. Building your study plan around the exact guide in force reduces the risk of preparing for a slightly outdated exam blueprint. For a full breakdown of what's actually tested, see the CP4 Exam Domains 2026: Complete Guide to All 13 Content Areas.

The June 1, 2027 CP3 Deadline You Cannot Ignore

This is the single most important scheduling fact for anyone mapping out a CP4 timeline in 2026: starting June 1, 2027, holding an active CP3 credential becomes a formal prerequisite to sit the CP4 exam. Right now, in 2026, CP3 is not required to test - but that changes on a fixed date, not a rolling basis.

This deadline has two direct implications for how you should plan:

• If you already meet CP4 eligibility without CP3, there is a real advantage to scheduling and sitting your exam before June 1, 2027, rather than waiting and having to add CP3 to your prerequisite checklist.
• If you don't yet hold CP3 and won't meet CP4 eligibility until closer to or after mid-2027, you need to build CP3 into your sequence now, since it becomes a gating requirement rather than an optional credential.

For a detailed walkthrough of every eligibility path - the degree-plus-experience combinations, the PE license route, and the responsible-charge requirements - see CP4 Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Application, Ethics Training, and Approval Timeline

Before you can book anything with Pearson VUE, your AMPP application has to be approved. This isn't a same-day process, and it's the part of the timeline most candidates underestimate when they're trying to nail down a target exam date.

Here's what factors into the approval clock:

• Documented experience. Eligibility requires four years of advanced cathodic-protection experience, including four years in responsible charge, combined with one of several qualifying academic or licensure paths (a qualifying bachelor's/advanced-degree combination, EIT registration or equivalent, or a PE license). Candidates without a qualifying degree can alternatively qualify with a relevant bachelor's degree plus six years of advanced experience, or two years of relevant postsecondary technical/trade education plus twelve years of advanced experience - each path still requiring four years in responsible charge.
• Ethics training. Approved ethics training (or an accepted equivalent) is required as part of the application, alongside the application itself.
• CP training. Formal cathodic protection training is recommended but not mandatory for CP4 - so it doesn't have to hold up your application timeline the way the ethics requirement does.

Because verification of experience and responsible-charge documentation takes time, build in a buffer between submitting your application and the date you'd realistically like to test. Rushing this step is one of the more avoidable causes of a missed target exam date.

Exam Day Logistics: 6 Hours, 75 Questions, Zero Personal Calculators

Once you have a confirmed date, it helps to know exactly what you're walking into so exam day itself isn't where surprises happen. The current combined Theory and Applied CP4 exam consists of 75 multiple-choice questions - 60 scored and 15 unscored - administered in a 6-hour session at a Pearson VUE test center.

A few operational details worth locking in before you schedule:

• Closed-book format. You won't bring your own reference binder - but you're not working from memory alone either. Specified equations, conversions, and reference materials are supplied at the test center.
• Calculators are provided, not personal. Digital TI-108 and TI-30XS calculators are made available on-screen or at the workstation; personal calculators are prohibited. If you've been practicing on your own device, switch to a TI-108/TI-30XS emulator well before test day so the interface isn't unfamiliar.
• Unscored items are mixed in. Fifteen of the 75 questions are unscored, but since you won't know which ones during the exam, every question needs to be treated as if it counts.

For a deeper look at how the scoring mechanics translate into a pass/fail outcome, see CP4 Passing Score 2026: Exactly What You Need to Pass, and for a broader difficulty assessment across all 13 domains, check How Hard Is the CP4 Exam? Complete Difficulty Guide 2026.

Scheduling Your Prep Around the 13 Domains

Your exam date should drive your study calendar backward, not the other way around. Because CP4's content is spread unevenly across 13 domains, the smartest scheduling move is to allocate study weeks in proportion to domain weight rather than splitting time evenly.

The remaining domains - Basics, Insulators and Shorts, Periodic Surveys, Reference Cells, AC Mitigation, Internal, Corrosion Theory, Polarization, and Codes and Compliance - each carry smaller individual weights, but collectively they still make up a large share of the exam and can't be skipped. A full domain-by-domain breakdown is available in the CP4 Exam Domains 2026 guide.

For a more complete week-by-week strategy that also covers registration logistics and mindset, see the CP4 Study Guide 2026: How to Pass on Your First Attempt. If you want to gauge readiness against real exam conditions, running through timed sets on our practice test site before you lock in a Pearson VUE date is one of the more reliable ways to confirm you're ready.

Planning for Renewal Three Years Out

Your first exam date isn't the last date that matters. CP4 certification is valid for 3 years, and renewal requires qualifying work, professional development activity, ethics compliance, and payment of the renewal fee. Because that clock starts the moment you pass, it's worth marking your renewal deadline on a calendar the same week you get your results - not three years later when it's suddenly close.

Candidates who plan ahead typically log qualifying work and professional development activity throughout the three-year cycle rather than scrambling in the final months. If you're still deciding whether the credential is worth pursuing at all given the ongoing renewal commitment, Is the CP4 Certification Worth It? Complete ROI Analysis 2026 weighs that tradeoff in more detail, and CP4 Certification Cost 2026: Complete Pricing Breakdown lays out the full cost picture across the exam and renewal cycle.

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