100+ Free Tree Worker Climber Practice Questions

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According to ANSI Z133, what is the minimum safe working distance from energized power lines rated at 50 kV or below for qualified line-clearance arborists?

15 feet

10 feet

20 feet

5 feet

to track

2026 Statistics

Key Facts: Tree Worker Climber Exam

80%

Written Passing Score

Updated May 2024

Scored Questions

Plus 15 pretest

90 min

Written Time Limit

Plus 45 min skills

18 mo

Experience Required

Climbing in arboriculture

3 years

Certification Valid

15 CEUs to renew

Content Domains

Updated 2024 outline

The ISA Certified Tree Climber exam requires 80% on the written component and 70% on the skills exam to pass. The written portion has 65 scored multiple-choice questions plus 15 unscored pretest questions, with a 90-minute time limit. Candidates need 18 months of climbing experience in arboriculture plus current CPR, First Aid, and aerial rescue training. The credential is the only global, industry-wide climber certification testing knowledge and skills against ANSI Z133 safety standards.

Sample Tree Worker Climber Practice Questions

Try these sample questions to test your Tree Worker Climber exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1According to ANSI Z133, what is the minimum safe working distance from energized power lines rated at 50 kV or below for qualified line-clearance arborists?

A.15 feet

B.10 feet

C.20 feet

D.5 feet

Explanation: ANSI Z133 specifies a minimum approach distance of 10 feet from energized conductors rated at 50 kV or below for qualified line-clearance arborists. Non-qualified workers must maintain even greater distances. This distance accounts for conductor sway, tool reach, and unexpected line movement.

2Which knot is most commonly used as the primary climbing hitch for ascending a climbing line?

A.Figure-eight on a bight

B.Clove hitch

C.Bowline

D.Blake's hitch

Explanation: Blake's hitch is a widely used friction hitch for ascending and descending on a climbing line. It grips the rope under load but can be easily advanced when unweighted. Bowline is a non-friction end-line knot, clove hitch is for securing to a carabiner or spar, and figure-eight on a bight creates a fixed loop.

3What type of personal protective equipment (PPE) is required when operating a chainsaw aloft?

A.Hard hat, hearing protection, safety glasses, chainsaw chaps or leg protection, and gloves

B.Hard hat and steel-toed boots only

C.Safety glasses and leather gloves only

D.Hard hat, hearing protection, and safety glasses only

Explanation: When operating a chainsaw aloft, ANSI Z133 and OSHA standards require a full complement of PPE including a hard hat, hearing protection, eye protection, chainsaw chaps or equivalent leg protection, and appropriate gloves. Chainsaw chaps contain fibers that jam the chainsaw sprocket on contact, greatly reducing the severity of leg injuries.

4What is the primary purpose of a false crotch or cambium saver when used as a redirect point?

A.To protect the bark and cambium at the redirect point and reduce rope friction

B.To allow faster descent from the tree

C.To increase the breaking strength of the climbing line

D.To prevent the rope from being cut by the chainsaw

Explanation: A cambium saver (false crotch) is placed over a branch union to protect the tree's bark and cambium layer from friction damage caused by the climbing rope. It also reduces friction on the rope, extending its service life. Additionally, it makes rope retrieval easier when the climber finishes the job.

5Before beginning a climb, a tree worker should always perform which of the following?

A.A soil pH test at the base of the tree

B.A measurement of the tree's total height using a clinometer

C.An assessment of the tree's monetary value

D.A thorough visual inspection of the tree and surrounding hazards

Explanation: Before climbing, ANSI Z133 requires a visual hazard assessment of the tree and work area. This includes checking for dead or hanging branches, cracks, cavities, signs of decay, electrical conductors, wildlife, and ground conditions. Identifying hazards before climbing is the most critical step to prevent accidents.

6What is the function of the notch cut (face cut) during tree felling?

A.To create a hinge that controls the direction of the tree's fall

B.To prevent sap from flowing during the cut

C.To weaken the tree so it can be pushed over by hand

D.To determine the species of the tree before felling

Explanation: The notch cut (face cut) creates a hinge of holding wood that controls the direction of the tree's fall. The notch is placed on the side of the tree facing the intended fall direction. A properly executed notch combined with a back cut creates a hinge that guides the tree predictably, which is essential for safe felling operations.

7Which of the following best describes the body thrust technique in tree climbing?

A.Using a ladder to access the first limb of the tree

B.Alternately pushing the body upward while advancing a friction hitch or mechanical device on the rope

C.Using a throwline to install a climbing rope in the canopy

D.Rappelling down the trunk of a tree using a descender

Explanation: The body thrust technique involves the climber alternately thrusting the body upward while advancing a friction hitch or mechanical ascender along the climbing rope. It is one of the fundamental rope-climbing methods used in arboriculture for ascending into the canopy before moving onto branches using the secured footlock or limb-walking techniques.

8What is the purpose of a work positioning lanyard (flipline) in tree climbing?

A.To position and secure the climber at a work station in the tree

B.To tie off the chainsaw when not in use

C.To lower cut branches to the ground

D.To redirect the climbing rope through the canopy

Explanation: A work positioning lanyard (flipline) is used to secure the climber at a work station by wrapping around the trunk or major limb. It allows the climber to lean back hands-free while performing tasks like pruning or rigging. The climber must always maintain a separate climbing line connection as a primary tie-in point in addition to the flipline.

9When pruning, what does the term 'crown cleaning' refer to?

A.Removing all branches from the lower third of the crown

B.Reducing the overall size of the crown by cutting back branch tips

C.Removing dead, diseased, broken, or weakly attached branches from the crown

D.Removing the top of the tree to reduce height

Explanation: Crown cleaning is the selective removal of dead, dying, diseased, broken, crossing, rubbing, or weakly attached branches from the tree crown. It is one of the most common pruning types described in ANSI A300 Part 1 standards. Crown cleaning improves tree health and reduces the risk of branch failure without significantly altering the tree's shape.

10What is the correct escape route angle when felling a tree?

A.Directly toward the face cut

B.Perpendicular to the direction of fall on the left side only

C.Directly behind the direction of fall

D.At a 45-degree angle away from each side of the expected fall path

Explanation: The standard escape route is at a 45-degree angle away from each side of the intended fall direction, going to the rear of the tree. This positions the faller away from the butt of the tree, which can kick back, and away from the fall path. Workers should clear the escape path of brush and obstacles before beginning the felling cuts.

About the Tree Worker Climber Exam

The ISA Certified Tree Worker Climber Specialist exam (now called ISA Certified Tree Climber) tests professional tree climbing competency across 5 content domains: Safety (26%), Tree Climbing and Rigging (22%), Tree Removal (22%), Pruning (20%), and Tree Identification and Health (10%). Updated in 2024, the exam includes both a 65-question multiple-choice written exam and a hands-on skills-based climbing practicum.

Questions

65 scored questions

Time Limit

90 minutes (written) + 45 minutes (skills)

Passing Score

80% (written) / 70% (skills)

Exam Fee

$295 (ISA members) / $369 (non-members) (ISA (International Society of Arboriculture))

Tree Worker Climber Exam Content Outline

26%

Safety

OSHA and ANSI Z133 regulations, personal protective equipment, aerial rescue procedures, electrical hazard awareness (EHAP), chainsaw safety, job hazard analysis, work zone setup, and general worksite safety protocols

22%

Tree Climbing and Rigging

Climbing techniques (footlock, body thrust, SRT, DdRT), rope types and specifications, knots and hitches (Blake's hitch, Prusik, bowline), rigging equipment (blocks, slings, lowering devices), load calculations, positive vs negative rigging, and equipment inspection

22%

Tree Removal

Felling techniques, notch types (conventional, open face, Humboldt), back cuts, bore cuts, hinge wood, escape routes, limbing and bucking, site assessment, tension and compression wood, and use of wedges and mechanical aids

10%

Tree Identification and Health

Tree biology (cambium, xylem, phloem), species identification using leaves, bark, twigs, and buds, coniferous vs deciduous classification, CODIT model, hazard recognition (cavities, cracks, conks, co-dominant stems), and tree health assessment

20%

Pruning

Pruning objectives and types (crown cleaning, thinning, raising, reduction), ANSI A300 standards, three-cut method, branch collar identification, cabling and bracing systems (steel and dynamic), improper practices (topping, lion's tailing), and live crown ratio guidelines

How to Pass the Tree Worker Climber Exam

What You Need to Know

Passing score: 80% (written) / 70% (skills)
Exam length: 65 questions
Time limit: 90 minutes (written) + 45 minutes (skills)
Exam fee: $295 (ISA members) / $369 (non-members)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Tree Worker Climber Study Tips from Top Performers

1Focus heavily on Safety (26%) — learn ANSI Z133 safety requirements, PPE standards, EHAP electrical safety distances, and aerial rescue procedures inside and out

2Practice tying the key climbing knots (Blake's hitch, Prusik, bowline, clove hitch, running bowline) until they become second nature

3Study all felling notch types (conventional, open face, Humboldt) and understand when to use bore cuts to prevent barberchair

4Know the difference between positive and negative rigging, and understand how fall distance multiplies dynamic forces on rigging points

5Review ANSI A300 pruning standards — especially crown cleaning, thinning, raising, and reduction techniques, plus the 25% live crown removal guideline

Frequently Asked Questions

How hard is the ISA Certified Tree Worker Climber Specialist exam?

The exam is moderately challenging, requiring both theoretical knowledge and practical climbing skills. The written exam requires 80% to pass with 65 scored questions covering safety, rigging, removal, pruning, and tree ID. The skills exam requires 70% and involves an actual outdoor climbing practicum. Candidates with 18+ months of climbing experience who study for 60-100 hours typically pass on their first attempt.

What are the eligibility requirements for the ISA Tree Worker Climber exam?

You must have 18 months of climbing experience in arboriculture, plus current valid training in CPR, First Aid, and a physical (practice) aerial rescue within the past year. Employment documentation or letters verifying climbing experience must be submitted with your application. There is no formal education requirement.

What is the format of the ISA Tree Climber exam?

The exam has two parts. The written portion consists of 65 scored multiple-choice questions plus 15 unscored pretest questions, with a 90-minute time limit. The skills-based portion is a 45-minute outdoor climbing practicum testing fundamental climbing skills with emphasis on safety. You must pass both components to earn the credential.

How much does the ISA Tree Worker Climber exam cost?

The application fee is $40 for ISA members (or credential holders) and $50 for non-members. The exam enrollment fee is $295 for ISA members and $369 for non-members. If retaking, the fee is $75 within one year of the first scheduled date. ISA membership provides significant savings on exam fees and recertification costs.

Can I waive the skills exam portion?

Yes, if you have been a participant in an ISA chapter, associate organization, or regional/International Tree Climbing Championship, you may waive the skills exam provided you meet all other requirements and complete the Skills Exam Waiver Form. This applies to tree climbing competition participants only.

How long is the ISA Tree Climber certification valid?

The certification is valid for 3 years. To recertify, you must accumulate at least 15 continuing education units (CEUs) during the three-year period, provide current proof of CPR, First Aid, and aerial rescue training, and pay the recertification fee ($220 base). Alternatively, you can retake and pass the certification exam.

What is the salary range for an ISA Certified Tree Worker Climber?

According to industry data, ISA Certified Tree Worker/Climber Specialists earn between $27,000 and $76,500 annually, with the median around $45,000-$55,000. Experienced climbing arborists in high-demand markets can earn $60,000-$80,000+. Certification typically increases earning potential compared to non-certified tree workers.