What Actually Goes Into a Tree Climbing Field Guide
A Tree Climbing Field Guide is basically a reference document you carry with you into the yard. It lists species, climbing conditions, hazard ratings, and recommended rigging setups for each tree you encounter. People who do this work for a living usually build their own because printed books get outdated fast and they never cover the edge cases you actually run into on site. I started building mine around 2018 after getting bitten by a mistake with live oak. I underestimated the tension on a main crotch because the guide I was following listed it as a standard split. It wasn't. The limb failed during an uphill retreat and nearly took my harness with it. After that, I started documenting every tree I climbed with notes on bark texture, decay signs, and which spurs actually bite without sliding. That became the foundation of my field guide.
Tree Climbing Field Guide: How to Build One That Works
You need a spreadsheet or a notes app that syncs to your phone. I use a simple Google Sheet with columns for species, trunk diameter, canopy spread, known defect zones, recommended tie-in height, preferred rope path, and notes on local wildlife activity. Each tree gets its own row. When you finish a job, you add observations right there. This keeps it current without you having to go back and fix memory gaps later. The species column is the most important one. Different species behave completely differently under load. Pine tends to have brittle branch unions that look fine from the ground but crack under dynamic force. Oak is the opposite — dense, heavy, and unforgiving if you anchor too low. Elm has those hidden cracks that show up nowhere until you're thirty feet up and the climber above you shifts weight. Maples are generally consistent but their hollow centers are a real problem if you're using a collar tie. You learn this by writing it down after you see it happen. Defect zones deserve their own column. I mark areas where I've seen cavities, fungal fruiting bodies, or insect entry points. This matters because a tree that looks sound at the base might have a rot pocket two feet above the ground that makes any anchor point in that zone unreliable. I learned this the hard way with a mature sugar maple. The bark looked solid. The sound test with a hammer gave a dull thud at about four feet. I ignored it and set my spiker there. The wood sheared off. I dropped six feet onto my rope before the backup engaged. Since then I tap everything at multiple heights before committing any weight.
Wildlife notes are not glamorous but they keep you alive. Wasp nests in cavities. Bees in hollow trunks. Rattlesnakes coiled in low crotches on warm mornings. I have a section in my guide for each tree that tracks seasonal patterns. A particular hickory on my regular route has a snake that comes out every April. I know to avoid tying in below eight feet that month. That kind of detail doesn't come from any book. It comes from showing up repeatedly and paying attention. There is a practical limitation to this approach. A field guide only helps if you actually consult it before you start climbing. I have seen arborists pull up their phone to check notes mid-climb, which is dangerous because it means both hands might not be free. The workaround is to print the relevant pages and laminate them, or keep a small physical notebook in your pack that has the quick-reference version. I carry a waterproof notepad with just species, defect zones, and recommended anchors. Everything else stays in the digital sheet for later review. Another limitation is that trees change over time. A tree that was healthy last year might have compromised structural wood this year due to storm damage or root disturbance from nearby construction. My guide gets a full update pass every spring and after any major weather event. I also flag trees that have been worked recently so I don't rely on stale data when conditions have shifted.
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Download Template
I put a basic template together that covers the columns I use. It includes preset species notes for common North American trees and a hazard scoring system I developed from years of field work. You can download it from the link below and adapt it to your region. Download Tree Climbing Field Guide Template One counter-intuitive thing most beginners miss is that the strongest anchor point on a tree is rarely the biggest branch. It is usually a medium-diameter limb that grows straight up from a solid trunk with a union angle between forty-five and sixty degrees. Wide V-shaped crotches look impressive but they are structurally weak because the bark gets pinched inside during formation. I once removed a branch that looked like a solid forty-inch anchor and found a complete bark inclusion running three inches deep into the wood. The climber behind me had already weighted it. We cut it before anyone got hurt, but it was a close call.
Another thing nobody talks about enough is the difference between static and dynamic loading in your guide. Static loading is your body weight plus gear. Dynamic loading is what happens when you swing, fall, or drop a limb. Your field guide should note which trees can handle dynamic forces without splitting. Some species absorb it fine. Others crack along the grain with a sharp report that sounds like a gunshot. I write this into the notes column after I have climbed each tree multiple times under different conditions. If you are just starting out, don't wait until you have a perfect guide before you go climbing. Build it alongside your experience. Wrong entries are better than no entries. You can correct them later. The worst outcome is showing up to a job site without any reference and guessing your way through a tree you have never seen before. That is how accidents happen.
