sailboat mast hoist

How To: Sailboat Mast Climbing Guide

Climbing your sailboat mast can be an easy and enjoyable activity. With the right equipment and information you will successfully be able to access all exterior parts of your mast. In this guide, I will teach you how to climb your mast with confidence. As with so many activities on a boat, safety must be your top priority when climbing your mast.

Regardless of your crew situation, the equipment necessary to safely climb your mast is basically the same: two halyards, a bosun's chair, and some form of harness. You can be hoisted by crew or ascend using an ascension device. The particular equipment you choose is up to your preference and budget.

Sailors die every year from improper climbing techniques. By doing your due diligence, you will be ready to safely climb your mast. Ascending your mast is not the time for cursory preparation, so you must double up on all safety equipment. Redundancy is key. Don't put yourself in a position where a single failure of equipment could mean your death.

I have been up my sailboat mast half a dozen times and have never felt unsafe or afraid while aloft. By always following thorough safety precautions and having solid communication with my crew, I actually enjoy going up the mast. It gives me perspective of my vessel and the surrounding area that is normally out of view. I hope this guide helps you enjoy your first time climbing your sailboat mast, as well.

I am not an expert on climbing sailboat masts. I do not know the condition or quality of your equipment. It is your responsibility to ensure your safety and the safety of your crew. This is solely a guide to help you feel better informed on this topic.

Table of contents

The Crewed Climber

The most basic way to climb a mast is to have a crew member crank you up using a winch. This method requires you to have a crew member on board with the brawn and willingness to do that job. If you are lucky enough to have a beefy, willing crew member then this section is for you.

Primary Safety Equipment (w/Crew)

Bosun's Chair
Main Halyard

Your primary safety equipment will consist of a bosun's chair (or equivalent) connected to a halyard. Ideally the halyard will be one that does not have a free-standing block at the top of the mast. Your main halyard will likely be your best option for your primary line.

Feed your primary line through your bosun's chairs double d-rings and secure using a bowline knot. Tying your halyard to your bosun's chair will eliminate possible failure at the halyard shackle.

Once you have tied your primary line to your bosun's chair using a bowline knot, clip the halyard shackle to the d-rings as a redundant safety measure.

Prior to using your bosun's chair, be sure to read the instruction manual for your particular model so that you are properly secured within the chair.

Secondary Safety Equipment (w/Crew)

Secondary line

On my sailboat, my husband and I have climbing harnesses that we use as backup to our bosun's chair. A foul weather harness will work for this application as well.

Put on the harness prior to getting into the bosun's chair. Just as with the primary line, use a bowline knot to secure the second halyard to your harness. On my sailboat, I use the spinnaker halyard as my secondary line. You may have a line better suited for the job such as a removable topping lift.

Which Winch?

Now that you have your primary and secondary gear set up, it's time to deal with the working end of your primary and secondary lines.

Due to the variation in block, winch, and cleat locations from boat to boat, it is difficult to give exact directions for how to set up your lines. On board my vessel we use the main halyard as our primary line. The main halyard runs out of our lower mast, through several blocks and back to our cockpit. We run the primary line back to our starboard jib sheet winch because it is self-tailing and has two speeds. Our secondary line runs back to the port jib sheet winch.

In this method it is necessary for both winches to be self-tailing.

Whichever line you choose to use as your primary line, you will need to find as unobstructed a path as possible for that line to join with your winch. Use blocks as needed to create a chafe-free path for your primary.

Every time I have climbed our mast, my husband has been below at the winch. Even though we use a winch that is self tailing, whenever possible we have a friend tailing the primary line. This additional safety precaution prevents line slippage and a possible accident.

The Hoisting Begins

You now have your harness on with your secondary line attached and you are in the bosun's chair with the primary line attached. It's time to test the system's strength. First, have your winch handler take out any slack in the primary line while you stand with knees bent at the mast base. Have your mate cleat off the primary line. Then, test the strength of it all by bouncing a few times in the bosun's chair.

It might seem silly bouncing around in the bosun's chair just above the deck, but it sure makes me feel better knowing that I have already put more stress on the system than I will at any other point during my climb.

Feeling confident that all systems are go, your crew member will begin cranking on the winch from the cockpit. Being raised up the mast can take a while. Be sure to wear shoes and gloves so that if you decide to assist in your ascension, you don't end up with paint slivers in your hands and feet.

Your crew member will crank you up a few feet at a time or perhaps a few inches at a time, depending on their vigor. Every time they pause on the primary winch, they will pull in slack on the secondary. They must secure the primary line prior to attending to the secondary. This will ensure that if your primary fails you will only drop a short distance onto your secondary line.

Once you have reached your working point on your mast, your crew member below will cleat off both lines. Your winch handler will surely feel like it's nap time but their job isn't over yet. While you're working, be sure your crew member stays attentive in case you realize you don't have the necessary tools for the job or you are ready to descend.

I have been at the top of my mast only to realize that I need a flat head instead of a Phillips, or electrical tape, or a multimeter. It's beyond frustrating to be at the top of the mast and realize that you forgot something or don't have what you need.

To save the arms of your cranking crewmember, bring a long piece of string in the pocket of your bosons chair. If you realize you need an additional tool, you can lower the string to your crew member and they will tie on the forgotten item for you to pull up. If you happen to be particularly forgetful, it would be clever to employ a canvas bag to receive the tools.

I have found that it's difficult to see the top of my mast while sitting in the bosun's chair even when it's fully raised. I remedy this by bringing a looped piece of webbing (a sling) which I connect with a carabiner to the top of my mast. I then step into the piece of webbing which raises me high enough to see the top of the mast .

The Fun Part

One of the most enjoyable parts of climbing the mast is coming back down. The work is done and now you get to enjoy a smooth, steady descent to deck level.

It's essential that your crew member below wear gloves for this part of the job. I recommend gloves for the entire job but certainly for this bit.

From the cockpit, your crew member will uncleat the secondary line and remove that line from it's winch. Your crew member will then take the line out of the self-tailing mechanism on the primary winch while maintaining a firm grip on the line. They will slowly let out the primary line while keeping three wraps on the winch. Continue slowly releasing line until all crew are deck side.

To aid in exiting the bosun's chair I recommend descending until you are sitting on deck. The extra slack will help you remove yourself from the bosun's chair as gracefully as possible.

The Crewless Climber

Knowing how to climb your mast independently is invaluable, even if you never sail solo. Lifting an adult using a winch can be difficult, time consuming, and tiring. By having the right equipment you can climb your mast with very little to no assistance.

Primary Safety Equipment (Solo)

There are many types of products on the market to help you climb the mast. There are ladders which utilize your mainsail mast track, webbing loops raised to the mast top using the main halyard, and permanently installed mast steps. Alternatively, there are devices which attach directly to the main halyard which allows you to climb the halyard. I'm going to refer to any device that is used to climb the halyard as an "ascension device".

Regardless of the ascension device you choose, these items are essential:

Ascension Device
3 Climbing Carabiners
2 Foot Slings

Secondary Safety Equipment (Solo)

Secondary Line
1 Climbing Carabiner

Sailboats are not all rigged the same. You may find that your spinnaker halyard is your only option for the secondary line. On some vessels, the topping lift will be the best option. You will need to determine which line works best for you.

Using The Ascension Device

The ladder style ascension devices are fairly self-explanatory. If you know how to climb a ladder, you're all set. So, I will not go into their use here. In this section, I will explain how to use a rock climbing ascension device to climb your mast.

This is an example of a rock climbing ascension device:

Beth lives on board her 1983 30ft S2 sailboat with her husband, 6 year-old son, and her two fur babies. She has been sailing and boating for most of her life. Beth has been blessed to experience cruising in the Great Lakes, the Bahamas, and in Alaska. She loves to travel and adores living on her tiny boat with her family.

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